From faa243c9d8ec768773c5b3ce039ecce1735b9ecb Mon Sep 17 00:00:00 2001
From: konsti <konstin@mailbox.org>
Date: Fri, 20 Feb 2026 08:39:27 +0100
Subject: [PATCH] Migrate tests from setuptools to uv_build (#18102)

uv_build is faster and has less network use than uv_build, and it's a
better practice to use it than setuptools, so we should do it in our own
tests.

Migrates only the easy tests, we do test setuptools features and quirks
in some places, those aren't touched. One commit per migrated
integration test file, for easier review.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
---
 crates/uv/tests/it/cache_prune.rs |  11 +-
 crates/uv/tests/it/export.rs      | 294 +++++++++++++++---------------
 crates/uv/tests/it/lock.rs        | 125 ++++++++-----
 crates/uv/tests/it/pip_compile.rs |  46 +++--
 crates/uv/tests/it/pip_install.rs |   8 +-
 crates/uv/tests/it/run.rs         | 203 ++++++++++++++++-----
 crates/uv/tests/it/sync.rs        | 195 ++++++++++++++------
 crates/uv/tests/it/tool_run.rs    |   5 +-
 crates/uv/tests/it/tree.rs        |   4 +-
 crates/uv/tests/it/workspace.rs   | 104 +++++------
 10 files changed, 627 insertions(+), 368 deletions(-)

diff --git a/crates/uv/tests/it/cache_prune.rs b/crates/uv/tests/it/cache_prune.rs
index e2bd6c17c..cf638b862 100644
--- a/crates/uv/tests/it/cache_prune.rs
+++ b/crates/uv/tests/it/cache_prune.rs
@@ -332,12 +332,17 @@ fn prune_stale_revision() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
-    context.temp_dir.child("src").child("__init__.py").touch()?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
     context.temp_dir.child("README").touch()?;
 
     let filters: Vec<_> = context
diff --git a/crates/uv/tests/it/export.rs b/crates/uv/tests/it/export.rs
index 673653ace..a9af0af99 100644
--- a/crates/uv/tests/it/export.rs
+++ b/crates/uv/tests/it/export.rs
@@ -29,8 +29,8 @@ fn requirements_txt_dependency() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -77,8 +77,8 @@ fn requirements_txt_export_no_header() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -123,8 +123,8 @@ fn requirements_txt_dependency_extra() -> Result<()> {
         dependencies = ["flask[dotenv]"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -210,8 +210,8 @@ fn requirements_txt_project_extra() -> Result<()> {
         pytest = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -423,8 +423,8 @@ fn requirements_txt_dependency_marker() -> Result<()> {
         dependencies = ["anyio ; sys_platform == 'darwin'", "iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -478,8 +478,8 @@ fn requirements_txt_dependency_multiple_markers() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -561,8 +561,8 @@ fn requirements_txt_dependency_conflicting_markers() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -808,8 +808,8 @@ fn requirements_txt_non_root() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -823,8 +823,8 @@ fn requirements_txt_non_root() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -869,8 +869,8 @@ fn allrequirements_txt_() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -884,8 +884,8 @@ fn allrequirements_txt_() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -944,8 +944,8 @@ fn requirements_txt_frozen() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -959,8 +959,8 @@ fn requirements_txt_frozen() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1026,8 +1026,8 @@ fn requirements_txt_create_missing_dir() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1510,8 +1510,8 @@ fn requirements_txt_non_project_workspace() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1588,8 +1588,8 @@ fn requirements_txt_non_project_fork() -> Result<()> {
         dependencies = ["anyio==2.0.0 ; sys_platform == 'win32'", "anyio==3.0.0 ; sys_platform == 'linux'"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1803,10 +1803,15 @@ fn requirements_txt_relative_path() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    dependency
+        .child("src")
+        .child("dependency")
+        .child("__init__.py")
+        .touch()?;
 
     let project = context.temp_dir.child("project");
     project.child("pyproject.toml").write_str(
@@ -1821,10 +1826,15 @@ fn requirements_txt_relative_path() -> Result<()> {
         dependency = { path = "../dependency" }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    project
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     context.lock().current_dir(&project).assert().success();
 
@@ -1894,8 +1904,8 @@ fn devrequirements_txt_() -> Result<()> {
         dev-dependencies = ["anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1986,8 +1996,8 @@ fn requirements_txt_no_hashes() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2028,8 +2038,8 @@ fn requirements_txt_output_file() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2101,8 +2111,8 @@ fn requirements_txt_no_emit() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2116,8 +2126,8 @@ fn requirements_txt_no_emit() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2235,8 +2245,8 @@ fn requirements_txt_no_emit() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2337,8 +2347,8 @@ fn requirements_txt_only_emit() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2352,8 +2362,8 @@ fn requirements_txt_only_emit() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2423,8 +2433,8 @@ fn requirements_txt_no_editable() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2438,8 +2448,8 @@ fn requirements_txt_no_editable() -> Result<()> {
         dependencies = ["iniconfig>=2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2944,8 +2954,8 @@ fn requirements_txt_conflicts() -> Result<()> {
         extra2 = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3679,8 +3689,8 @@ fn pep_751_dependency() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3742,8 +3752,8 @@ fn pep_751_export_no_header() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3803,8 +3813,8 @@ fn pep_751_export_no_editable() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3866,8 +3876,8 @@ fn pep_751_dependency_extra() -> Result<()> {
         dependencies = ["flask[dotenv]"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3987,8 +3997,8 @@ fn pep_751_project_extra() -> Result<()> {
         pytest = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -4425,8 +4435,8 @@ fn pep_751_infer_output_format() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -4561,8 +4571,8 @@ fn pep_751_filename() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -4943,8 +4953,8 @@ fn cyclonedx_export_basic() -> Result<()> {
         dependencies = ["urllib3==2.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5025,8 +5035,8 @@ fn cyclonedx_export_direct_url() -> Result<()> {
         dependencies = ["idna @ https://files.pythonhosted.org/packages/c2/e7/a82b05cf63a603df6e68d59ae6a68bf5064484a0718ea5033660af4b54a9/idna-3.6-py3-none-any.whl"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5108,8 +5118,8 @@ fn cyclonedx_export_git_dependency() -> Result<()> {
         dependencies = ["urllib3 @ git+https://github.com/urllib3/urllib3.git@2.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5190,8 +5200,8 @@ fn cyclonedx_export_no_dependencies() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5263,8 +5273,8 @@ fn cyclonedx_export_mixed_source_types() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5373,8 +5383,8 @@ fn cyclonedx_export_project_extra() -> Result<()> {
         pytest = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5459,8 +5469,8 @@ fn cyclonedx_export_project_extra_with_optional_flag() -> Result<()> {
         pytest = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5572,8 +5582,8 @@ fn cyclonedx_export_with_workspace_member() -> Result<()> {
         child2 = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5587,8 +5597,8 @@ fn cyclonedx_export_with_workspace_member() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5602,8 +5612,8 @@ fn cyclonedx_export_with_workspace_member() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5737,8 +5747,8 @@ fn cyclonedx_export_workspace_non_root() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5752,8 +5762,8 @@ fn cyclonedx_export_workspace_non_root() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5844,8 +5854,8 @@ fn cyclonedx_export_workspace_with_extras() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -5859,8 +5869,8 @@ fn cyclonedx_export_workspace_with_extras() -> Result<()> {
         dependencies = ["typing-extensions==4.10.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6065,8 +6075,8 @@ fn cyclonedx_export_workspace_frozen() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6080,8 +6090,8 @@ fn cyclonedx_export_workspace_frozen() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6226,8 +6236,8 @@ fn cyclonedx_export_workspace_all_packages() -> Result<()> {
         members = ["child1", "child2"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6241,8 +6251,8 @@ fn cyclonedx_export_workspace_all_packages() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6256,8 +6266,8 @@ fn cyclonedx_export_workspace_all_packages() -> Result<()> {
         dependencies = ["sniffio==1.3.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6415,8 +6425,8 @@ fn cyclonedx_export_all_packages_non_workspace_root_dependency() -> Result<()> {
         dependencies = ["urllib3==2.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6521,8 +6531,8 @@ fn cyclonedx_export_workspace_mixed_dependencies() -> Result<()> {
         child1 = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6539,8 +6549,8 @@ fn cyclonedx_export_workspace_mixed_dependencies() -> Result<()> {
         child2 = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6554,8 +6564,8 @@ fn cyclonedx_export_workspace_mixed_dependencies() -> Result<()> {
         dependencies = ["sniffio==1.3.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6699,8 +6709,8 @@ fn cyclonedx_export_dependency_marker() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6802,8 +6812,8 @@ fn cyclonedx_export_multiple_dependency_markers() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6928,8 +6938,8 @@ fn cyclonedx_export_dependency_extra() -> Result<()> {
         dependencies = ["cryptography[ssh]==42.0.5"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -7614,8 +7624,8 @@ fn cyclonedx_export_no_emit() -> Result<()> {
         child = { workspace = true }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -7629,8 +7639,8 @@ fn cyclonedx_export_no_emit() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -7812,8 +7822,8 @@ fn cyclonedx_export_relative_path() -> Result<()> {
         dependencies = ["iniconfig==2.0.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -7830,8 +7840,8 @@ fn cyclonedx_export_relative_path() -> Result<()> {
         dependency = { path = "../dependency" }
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8127,8 +8137,8 @@ fn cyclonedx_export_dev_dependencies() -> Result<()> {
         dev-dependencies = ["urllib3==2.2.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8348,8 +8358,8 @@ fn cyclonedx_export_all_packages_conflicting_workspace_members() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8363,8 +8373,8 @@ fn cyclonedx_export_all_packages_conflicting_workspace_members() -> Result<()> {
         dependencies = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8492,8 +8502,8 @@ fn cyclonedx_export_alternative_registry() -> Result<()> {
         dependencies = ["torch==2.6.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [[tool.uv.index]]
         name = "pytorch-cpu"
@@ -8894,8 +8904,8 @@ fn pylock_toml_filter_by_requires_python() -> Result<()> {
         dependencies = ["numpy==1.26.4"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
diff --git a/crates/uv/tests/it/lock.rs b/crates/uv/tests/it/lock.rs
index 22cdd752b..3c72cdf95 100644
--- a/crates/uv/tests/it/lock.rs
+++ b/crates/uv/tests/it/lock.rs
@@ -2923,8 +2923,8 @@ fn lock_conflicting_project_basic1() -> Result<()> {
         foo = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2963,8 +2963,8 @@ fn lock_conflicting_project_basic1() -> Result<()> {
         foo = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -3047,6 +3047,13 @@ fn lock_conflicting_project_basic1() -> Result<()> {
     Resolved 3 packages in [TIME]
     ");
 
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
+
     // Install from the lockfile.
     uv_snapshot!(context.filters(), context.sync().arg("--frozen"), @"
     success: true
@@ -3893,11 +3900,19 @@ fn lock_conflicting_project_basic2() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
+    context.temp_dir.child("README.md").touch()?;
+    context
+        .temp_dir
+        .child("src")
+        .child("example")
+        .child("__init__.py")
+        .touch()?;
+
     uv_snapshot!(context.filters(), context.lock(), @"
     success: true
     exit_code: 0
@@ -4069,8 +4084,8 @@ fn lock_conflicting_mixed() -> Result<()> {
         project2 = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -4112,8 +4127,8 @@ fn lock_conflicting_mixed() -> Result<()> {
         project2 = ["sortedcontainers==2.4.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -4197,6 +4212,13 @@ fn lock_conflicting_mixed() -> Result<()> {
     Resolved 3 packages in [TIME]
     ");
 
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
+
     // Install from the lockfile.
     uv_snapshot!(context.filters(), context.sync().arg("--frozen"), @"
     success: true
@@ -7579,8 +7601,8 @@ fn lock_relative_and_absolute_paths() -> Result<()> {
         license = {text = "MIT"}
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
     "#})?;
     context.temp_dir.child("b/b/__init__.py").touch()?;
@@ -7596,8 +7618,8 @@ fn lock_relative_and_absolute_paths() -> Result<()> {
         license = {text = "MIT"}
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     context.temp_dir.child("c/c/__init__.py").touch()?;
 
@@ -9058,8 +9080,8 @@ fn lock_exclusion() -> Result<()> {
         dependencies = ["project"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         project = { path = ".." }
@@ -9259,8 +9281,8 @@ fn lock_non_workspace_source() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -9310,8 +9332,8 @@ fn lock_no_workspace_source() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -9367,8 +9389,8 @@ fn lock_peer_member() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
         )?;
 
@@ -9478,8 +9500,8 @@ async fn lock_index_workspace_member() -> Result<()> {
         iniconfig = {{ index = "my-index" }}
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
         proxy_uri = proxy.uri()
     ))?;
@@ -9613,8 +9635,8 @@ fn lock_dev_transitive() -> Result<()> {
         dependencies = ["foo", "baz", "iniconfig>1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         foo = { path = "../foo" }
@@ -9638,14 +9660,17 @@ fn lock_dev_transitive() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         dev-dependencies = ["typing-extensions>4"]
         "#,
     )?;
 
+    bar.child("src").child("bar").child("__init__.py").touch()?;
+    baz.child("src").child("baz").child("__init__.py").touch()?;
+
     uv_snapshot!(context.filters(), context.lock().current_dir(&bar), @"
     success: true
     exit_code: 0
@@ -10776,8 +10801,8 @@ fn lock_no_sources() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -12987,8 +13012,8 @@ fn lock_editable() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         library = { path = "../../library" }
@@ -13004,8 +13029,8 @@ fn lock_editable() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     library.child("src/__init__.py").touch()?;
 
@@ -13087,8 +13112,8 @@ fn lock_editable() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         library = { path = "../../library", editable = true }
@@ -14931,8 +14956,8 @@ fn lock_add_member_with_build_system() -> Result<()> {
         dependencies = ["anyio>3"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -15831,8 +15856,8 @@ fn lock_remove_member_non_project() -> Result<()> {
         dependencies = ["anyio>3"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -16667,8 +16692,8 @@ fn lock_narrowed_python_version() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -19394,8 +19419,8 @@ fn lock_repeat_named_index_member() -> Result<()> {
         url = "https://astral-sh.github.io/pytorch-mirror/whl/cpu"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         idna = { index = "pytorch" }
@@ -19802,8 +19827,8 @@ fn lock_explicit_virtual_project() -> Result<()> {
         dependencies = ["black"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         package = false
@@ -24672,8 +24697,8 @@ fn lock_group_workspace() -> Result<()> {
         testing = ["pytest>8"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -28544,8 +28569,8 @@ fn lock_script_path() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
diff --git a/crates/uv/tests/it/pip_compile.rs b/crates/uv/tests/it/pip_compile.rs
index 92373fc05..be3581a16 100644
--- a/crates/uv/tests/it/pip_compile.rs
+++ b/crates/uv/tests/it/pip_compile.rs
@@ -186,7 +186,8 @@ fn compile_pyproject_toml() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -227,7 +228,8 @@ fn compile_pyproject_toml_dynamic_version() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -267,7 +269,8 @@ fn compile_pyproject_toml_with_line_annotation() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -698,7 +701,8 @@ fn compile_pyproject_toml_extra() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -741,7 +745,8 @@ fn compile_pyproject_toml_extra_name_normalization() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -784,7 +789,8 @@ fn compile_pyproject_toml_extra_missing() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -1151,7 +1157,8 @@ fn compile_pyproject_toml_invalid_name() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "!project"
@@ -1169,9 +1176,9 @@ dependencies = [
 
     ----- stderr -----
     error: Failed to parse: `pyproject.toml`
-      Caused by: TOML parse error at line 5, column 8
+      Caused by: TOML parse error at line 6, column 8
       |
-    5 | name = "!project"
+    6 | name = "!project"
       |        ^^^^^^^^^^
     Not a valid package or extra name: "!project". Names must start and end with a letter or digit and may only contain -, _, ., and alphanumeric characters.
     "#
@@ -1187,7 +1194,8 @@ fn compile_pyproject_toml_extras_missing() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -1249,7 +1257,8 @@ fn invalid_extra_name() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -3154,7 +3163,8 @@ fn compile_pyproject_toml_all_extras() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -3210,7 +3220,8 @@ fn compile_pyproject_toml_all_extras_annotation_line() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -3257,7 +3268,8 @@ fn compile_does_not_allow_both_extra_and_all_extras() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "project"
@@ -3300,7 +3312,8 @@ fn compile_unsolvable_requirements() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "my-project"
@@ -3332,7 +3345,8 @@ fn compile_unsolvable_requirements_version_not_available() -> Result<()> {
     let pyproject_toml = context.temp_dir.child("pyproject.toml");
     pyproject_toml.write_str(
         r#"[build-system]
-requires = ["setuptools>=42"]
+requires = ["uv_build>=0.7,<10000"]
+build-backend = "uv_build"
 
 [project]
 name = "my-project"
diff --git a/crates/uv/tests/it/pip_install.rs b/crates/uv/tests/it/pip_install.rs
index 3d29517ca..71dcf8fcb 100644
--- a/crates/uv/tests/it/pip_install.rs
+++ b/crates/uv/tests/it/pip_install.rs
@@ -3419,9 +3419,13 @@ fn install_no_downgrade() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
+    idna.child("src")
+        .child("idna")
+        .child("__init__.py")
+        .touch()?;
 
     // Install the local `idna`.
     uv_snapshot!(context.filters(), context.pip_install()
diff --git a/crates/uv/tests/it/run.rs b/crates/uv/tests/it/run.rs
index 2dc8d532f..6b8d2ce25 100644
--- a/crates/uv/tests/it/run.rs
+++ b/crates/uv/tests/it/run.rs
@@ -29,10 +29,16 @@ fn run_with_python_version() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r#"
         import importlib.metadata
@@ -156,10 +162,16 @@ fn run_args() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     // We treat arguments before the command as uv arguments
     uv_snapshot!(context.filters(), context.run().arg("--help").arg("python"), @"
@@ -210,10 +222,16 @@ fn run_no_args() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     // Run without specifying any arguments.
     #[cfg(not(windows))]
@@ -278,10 +296,16 @@ fn run_pep723_script() -> Result<()> {
         dependencies = ["anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     // If the script contains a PEP 723 tag, we should install its requirements.
     let test_script = context.temp_dir.child("main.py");
@@ -547,10 +571,16 @@ fn run_pythonw_script() -> Result<()> {
         dependencies = ["anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.pyw");
     test_script.write_str(indoc! { r"
@@ -1057,8 +1087,8 @@ fn run_managed_false() -> Result<()> {
         dependencies = ["anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         managed = false
@@ -1159,10 +1189,16 @@ fn run_with() -> Result<()> {
         dependencies = ["sniffio==1.3.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r"
@@ -1286,10 +1322,16 @@ fn run_with_pyvenv_cfg_file() -> Result<()> {
         requires-python = ">=3.8"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r#"
@@ -1339,8 +1381,8 @@ fn run_with_overlay_interpreter() -> Result<()> {
         dependencies = ["anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [project.scripts]
         main = "foo:main"
@@ -2167,10 +2209,16 @@ fn run_locked() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running with `--locked` should error, if no lockfile is present.
     uv_snapshot!(context.filters(), context.run().arg("--locked").arg("--").arg("python").arg("--version"), @"
@@ -2254,8 +2302,8 @@ fn run_locked() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2331,10 +2379,16 @@ fn run_frozen() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running with `--frozen` should error, if no lockfile is present.
     uv_snapshot!(context.filters(), context.run().arg("--frozen").arg("--").arg("python").arg("--version"), @"
@@ -2358,8 +2412,8 @@ fn run_frozen() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -2396,10 +2450,16 @@ fn run_no_sync() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running with `--no-sync` should succeed error, even if the lockfile isn't present.
     uv_snapshot!(context.filters(), context.run().arg("--no-sync").arg("--").arg("python").arg("--version"), @"
@@ -2455,10 +2515,16 @@ fn run_no_sync_env_var() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running with `UV_NO_SYNC=1` should succeed, even if the lockfile isn't present.
     uv_snapshot!(context.filters(), context.run().env(EnvVars::UV_NO_SYNC, "1").arg("--").arg("python").arg("--version"), @"
@@ -2510,10 +2576,16 @@ fn run_empty_requirements_txt() -> Result<()> {
         dependencies = ["anyio", "sniffio==1.3.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r"
@@ -2570,10 +2642,16 @@ fn run_requirements_txt() -> Result<()> {
         dependencies = ["anyio", "sniffio==1.3.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r"
@@ -2720,10 +2798,16 @@ fn run_requirements_txt_arguments() -> Result<()> {
         dependencies = ["typing_extensions"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r"
@@ -2774,8 +2858,8 @@ fn run_editable() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
 
@@ -3006,10 +3090,16 @@ fn run_without_output() -> Result<()> {
         dependencies = ["anyio", "sniffio==1.3.1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r"
@@ -3490,10 +3580,16 @@ fn run_isolated_does_not_modify_lock() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r#"
         import importlib.metadata
@@ -3593,10 +3689,16 @@ fn run_isolated_with_frozen() -> Result<()> {
         ]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    context
+        .temp_dir
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
     let test_script = context.temp_dir.child("main.py");
     test_script.write_str(indoc! { r#"
         import importlib.metadata
@@ -3776,8 +3878,8 @@ fn run_invalid_project_table() -> Result<()> {
         repository = 'https://github.com/octocat/octocat-python'
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
 
@@ -6173,10 +6275,15 @@ fn run_target_workspace_discovery() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
+    workspace
+        .child("src")
+        .child("foo")
+        .child("__init__.py")
+        .touch()?;
 
     // Create a script in the workspace that imports from the project.
     workspace.child("script.py").write_str(indoc! { r"
diff --git a/crates/uv/tests/it/sync.rs b/crates/uv/tests/it/sync.rs
index b4d0930f4..5a0f7c9f8 100644
--- a/crates/uv/tests/it/sync.rs
+++ b/crates/uv/tests/it/sync.rs
@@ -241,8 +241,8 @@ fn package() -> Result<()> {
         dependencies = ["iniconfig>=1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -252,6 +252,12 @@ fn package() -> Result<()> {
     let init = src.child("__init__.py");
     init.touch()?;
 
+    child
+        .child("src")
+        .child("child")
+        .child("__init__.py")
+        .touch()?;
+
     uv_snapshot!(context.filters(), context.sync().arg("--package").arg("child"), @"
     success: true
     exit_code: 0
@@ -699,11 +705,11 @@ fn mixed_requires_python() -> Result<()> {
     let child = context.temp_dir.child("packages").child("bird-feeder");
     child.create_dir_all()?;
 
-    let src = context.temp_dir.child("src").child("bird_feeder");
-    src.create_dir_all()?;
-
-    let init = src.child("__init__.py");
-    init.touch()?;
+    child
+        .child("src")
+        .child("bird_feeder")
+        .child("__init__.py")
+        .touch()?;
 
     let pyproject_toml = child.child("pyproject.toml");
     pyproject_toml.write_str(
@@ -714,8 +720,8 @@ fn mixed_requires_python() -> Result<()> {
         requires-python = ">=3.9"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -1766,13 +1772,19 @@ fn sync_build_isolation_extra() -> Result<()> {
         compile = ["source-distribution @ https://files.pythonhosted.org/packages/10/1f/57aa4cce1b1abf6b433106676e15f9fa2c92ed2bd4cf77c3b50a9e9ac773/source_distribution-0.0.1.tar.gz"]
 
         [build-system]
-        requires = ["setuptools >= 40.9.0"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         no-build-isolation-package = ["source-distribution"]
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running `uv sync` should fail for the `compile` extra.
     uv_snapshot!(context.filters(), context.sync().arg("--extra").arg("compile"), @r#"
@@ -4636,10 +4648,17 @@ fn sync_group_member() -> Result<()> {
         dependencies = ["iniconfig>=1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
         )?;
+    context
+        .temp_dir
+        .child("child")
+        .child("src")
+        .child("child")
+        .child("__init__.py")
+        .touch()?;
 
     // Generate a lockfile.
     context.lock().assert().success();
@@ -4695,10 +4714,17 @@ fn sync_group_non_project_member() -> Result<()> {
         dependencies = ["iniconfig>=1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
         )?;
+    context
+        .temp_dir
+        .child("child")
+        .child("src")
+        .child("child")
+        .child("__init__.py")
+        .touch()?;
 
     // Generate a lockfile.
     uv_snapshot!(context.filters(), context.lock(), @"
@@ -4802,14 +4828,20 @@ fn sync_group_self() -> Result<()> {
         test = ["idna>=3"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [dependency-groups]
         foo = ["project", "typing-extensions>=4"]
         bar = ["project[test]"]
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Generate a lockfile.
     uv_snapshot!(context.filters(), context.lock(), @"
@@ -5349,10 +5381,16 @@ fn read_metadata_statically_over_the_cache() -> Result<()> {
         dependencies = ["anyio>=4,<5"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     context.sync().assert().success();
     let lock1 = context.read("uv.lock");
@@ -5382,10 +5420,16 @@ fn no_install_project() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Generate a lockfile.
     context.lock().assert().success();
@@ -5436,8 +5480,8 @@ fn no_install_workspace() -> Result<()> {
         dependencies = ["anyio==3.7.0", "child"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["child"]
@@ -5446,6 +5490,12 @@ fn no_install_workspace() -> Result<()> {
         child = { workspace = true }
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Add a workspace member.
     let child = context.temp_dir.child("child");
@@ -5458,8 +5508,8 @@ fn no_install_workspace() -> Result<()> {
         dependencies = ["iniconfig>=1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
     child
@@ -5575,8 +5625,8 @@ fn no_install_local() -> Result<()> {
         dependencies = ["anyio==3.7.0", "local", "local-editable", "workspace-member"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         local = { path = "./local" }
@@ -5587,6 +5637,12 @@ fn no_install_local() -> Result<()> {
         members = ["workspace-member"]
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Add a local package, local editable package, and then a workspace member
     // as a dependency.
@@ -5659,10 +5715,16 @@ fn no_install_package() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Generate a lockfile.
     context.lock().assert().success();
@@ -5716,8 +5778,8 @@ fn no_install_project_no_build() -> Result<()> {
         dependencies = ["anyio==3.7.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -6166,10 +6228,16 @@ fn convert_to_virtual() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running `uv sync` should install the project itself.
     uv_snapshot!(context.filters(), context.sync(), @"
@@ -6361,10 +6429,16 @@ fn convert_to_package() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("project")
+        .child("__init__.py")
+        .touch()?;
 
     // Running `uv sync` should install the project itself.
     uv_snapshot!(context.filters(), context.sync(), @"
@@ -7382,10 +7456,16 @@ fn sync_update_project() -> Result<()> {
         dependencies = ["iniconfig"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
+    context
+        .temp_dir
+        .child("src")
+        .child("my_project")
+        .child("__init__.py")
+        .touch()?;
 
     uv_snapshot!(context.filters(), context.sync(), @"
     success: true
@@ -8065,8 +8145,8 @@ fn transitive_dev() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         dev-dependencies = ["iniconfig>=1"]
@@ -8079,6 +8159,12 @@ fn transitive_dev() -> Result<()> {
     let init = src.child("__init__.py");
     init.touch()?;
 
+    child
+        .child("src")
+        .child("child")
+        .child("__init__.py")
+        .touch()?;
+
     uv_snapshot!(context.filters(), context.sync().arg("--dev"), @"
     success: true
     exit_code: 0
@@ -8113,8 +8199,8 @@ fn sync_no_editable() -> Result<()> {
         dependencies = ["child"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         child = { workspace = true }
@@ -8130,6 +8216,13 @@ fn sync_no_editable() -> Result<()> {
     let init = src.child("__init__.py");
     init.touch()?;
 
+    context
+        .temp_dir
+        .child("src")
+        .child("root")
+        .child("__init__.py")
+        .touch()?;
+
     let child = context.temp_dir.child("child");
     fs_err::create_dir_all(&child)?;
 
@@ -8142,8 +8235,8 @@ fn sync_no_editable() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8411,8 +8504,8 @@ fn build_system_requires_workspace() -> Result<()> {
         dependencies = ["typing-extensions>=3.10"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -8494,8 +8587,8 @@ fn build_system_requires_path() -> Result<()> {
         dependencies = ["typing-extensions>=3.10"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
@@ -9121,8 +9214,8 @@ fn sync_all() -> Result<()> {
         dependencies = ["anyio>3", "child"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["child"]
@@ -9149,8 +9242,8 @@ fn sync_all() -> Result<()> {
         dependencies = ["iniconfig>=1"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
     child
diff --git a/crates/uv/tests/it/tool_run.rs b/crates/uv/tests/it/tool_run.rs
index bd5bb0cef..fa5aa2822 100644
--- a/crates/uv/tests/it/tool_run.rs
+++ b/crates/uv/tests/it/tool_run.rs
@@ -2585,14 +2585,15 @@ fn run_with_env_file() -> anyhow::Result<()> {
         script = "foo.main:run"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#
     })?;
 
     // Create the `foo` module.
     let foo_project_src = foo_dir.child("src");
     let foo_module = foo_project_src.child("foo");
+    foo_module.child("__init__.py").touch()?;
     let foo_main_py = foo_module.child("main.py");
     foo_main_py.write_str(indoc! { r#"
         def run():
diff --git a/crates/uv/tests/it/tree.rs b/crates/uv/tests/it/tree.rs
index 1e0eeee7b..701e2f50a 100644
--- a/crates/uv/tests/it/tree.rs
+++ b/crates/uv/tests/it/tree.rs
@@ -1144,8 +1144,8 @@ fn non_project_member() -> Result<()> {
         dependencies = ["iniconfig", "sniffio", "anyio"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
         "#,
     )?;
 
diff --git a/crates/uv/tests/it/workspace.rs b/crates/uv/tests/it/workspace.rs
index 1f2cdb6dd..6c419908d 100644
--- a/crates/uv/tests/it/workspace.rs
+++ b/crates/uv/tests/it/workspace.rs
@@ -1355,8 +1355,8 @@ fn workspace_inherit_sources() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1372,8 +1372,8 @@ fn workspace_inherit_sources() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     leaf.child("src/__init__.py").touch()?;
 
@@ -1386,8 +1386,8 @@ fn workspace_inherit_sources() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     library.child("src/__init__.py").touch()?;
 
@@ -1415,8 +1415,8 @@ fn workspace_inherit_sources() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         library = { path = "../../../library", editable = true }
@@ -1443,8 +1443,8 @@ fn workspace_inherit_sources() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
 
     // Update the root to include the source.
@@ -1456,8 +1456,8 @@ fn workspace_inherit_sources() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         library = { path = "../library", editable = true }
@@ -1532,8 +1532,8 @@ fn workspace_inherit_sources() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         library = { path = "../library", editable = true }
@@ -1550,8 +1550,8 @@ fn workspace_inherit_sources() -> Result<()> {
         dependencies = ["library"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.sources]
         application = { path = "../application", editable = true }
@@ -1589,8 +1589,8 @@ fn workspace_unsatisfiable_member_dependencies() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1606,8 +1606,8 @@ fn workspace_unsatisfiable_member_dependencies() -> Result<()> {
         dependencies = ["httpx>9999"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     leaf.child("src/__init__.py").touch()?;
 
@@ -1645,8 +1645,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1662,8 +1662,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting() -> Result<()> {
         dependencies = ["anyio==4.1.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     foo.child("src/__init__.py").touch()?;
     let bar = workspace.child("packages").child("bar");
@@ -1674,8 +1674,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting() -> Result<()> {
         dependencies = ["anyio==4.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     bar.child("src/__init__.py").touch()?;
 
@@ -1713,8 +1713,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_threeway() -> Result<
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1730,8 +1730,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_threeway() -> Result<
         dependencies = ["anyio==4.1.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     red.child("src/__init__.py").touch()?;
     let knot = workspace.child("packages").child("knot");
@@ -1742,8 +1742,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_threeway() -> Result<
         dependencies = ["anyio==4.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     knot.child("src/__init__.py").touch()?;
 
@@ -1757,8 +1757,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_threeway() -> Result<
         dependencies = ["anyio==4.3.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     bird.child("src/__init__.py").touch()?;
 
@@ -1796,8 +1796,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_extra() -> Result<()>
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1813,8 +1813,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_extra() -> Result<()>
         dependencies = ["anyio==4.1.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     foo.child("src/__init__.py").touch()?;
     let bar = workspace.child("packages").child("bar");
@@ -1827,8 +1827,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_extra() -> Result<()>
         some_extra = ["anyio==4.2.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     bar.child("src/__init__.py").touch()?;
 
@@ -1866,8 +1866,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_dev() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1883,8 +1883,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_dev() -> Result<()> {
         dependencies = ["anyio==4.1.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     foo.child("src/__init__.py").touch()?;
     let bar = workspace.child("packages").child("bar");
@@ -1894,8 +1894,8 @@ fn workspace_unsatisfiable_member_dependencies_conflicting_dev() -> Result<()> {
         version = "0.1.0"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv]
         dev-dependencies = ["anyio==4.2.0"]
@@ -1937,8 +1937,8 @@ fn workspace_member_name_shadows_dependencies() -> Result<()> {
         requires-python = ">=3.12"
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
 
         [tool.uv.workspace]
         members = ["packages/*"]
@@ -1954,8 +1954,8 @@ fn workspace_member_name_shadows_dependencies() -> Result<()> {
         dependencies = ["anyio==4.1.0"]
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     foo.child("src/__init__.py").touch()?;
 
@@ -1968,8 +1968,8 @@ fn workspace_member_name_shadows_dependencies() -> Result<()> {
         dependencies = []
 
         [build-system]
-        requires = ["setuptools>=42"]
-        build-backend = "setuptools.build_meta"
+        requires = ["uv_build>=0.7,<10000"]
+        build-backend = "uv_build"
     "#})?;
     anyio.child("src/__init__.py").touch()?;