diff --git a/.github/workflows/test-system.yml b/.github/workflows/test-system.yml
index 293d40c03..792245b70 100644
--- a/.github/workflows/test-system.yml
+++ b/.github/workflows/test-system.yml
@@ -13,14 +13,14 @@ jobs:
     timeout-minutes: 10
     name: "python on debian"
     runs-on: ubuntu-latest
-    container: debian:bookworm
+    container: debian:trixie@sha256:5cf544fad978371b3df255b61e209b373583cb88b733475c86e49faa15ac2104
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
 
       - name: "Install Python"
-        run: apt-get update && apt-get install -y python3.11 python3-pip python3.11-venv python3-debian
+        run: apt-get update && apt-get install -y python3 python3-pip python3-venv python3-debian
 
       - name: "Download binary"
         uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4.3.0
@@ -31,15 +31,15 @@ jobs:
         run: chmod +x ./uv
 
       - name: "Print Python path"
-        run: echo $(which python3.11)
+        run: echo $(which python3)
 
       - name: "Validate global Python install"
-        run: python3.11 scripts/check_system_python.py --uv ./uv --externally-managed
+        run: python3 scripts/check_system_python.py --uv ./uv --externally-managed
 
       - name: "Test `uv run` with system Python"
         run: |
-          ./uv run -p python3.11 -v python -c "import debian"
-          ./uv run -p python3.11 -v --with anyio python -c "import debian"
+          ./uv run -p python3 -v python -c "import debian"
+          ./uv run -p python3 -v --with anyio python -c "import debian"
 
   system-test-fedora:
     timeout-minutes: 10