uv/docs/reference/policies/versioning.md

# Versioning

uv is widely used in production and is stable software.

uv uses a custom versioning scheme in which the minor version number is bumped for breaking changes,
and the patch version number is bumped for bug fixes, enhancements, and other non-breaking changes.

The care we take in backwards-incompatible changes is proportional to the expected real-world
impact, not a function of arbitrary version numbering policies. We value the ability to iterate on
new features quickly and gather changes that _could_ be breaking into clearly marked releases.

uv's changelog can be [viewed on GitHub](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md).

## Crate versioning

uv's crates are published to [crates.io](https://crates.io). The following crates follow the normal
uv versioning policy:

- `uv`
- `uv-build`
- `uv-version`

The `uv` and `uv-build` crates are versioned by the binary command-line interface. The Rust
interface of these crates does not follow semantic versioning.

The remainder of uv's crates provide **no stability guarantees**. The Rust interface is considered
internal and unstable. Consequently, they are versioned as `0.0.x`. The patch version is incremented
on every uv release, regardless of changes to the crate.

## Cache versioning

Cache versions are considered internal to uv, and so may be changed in a minor or patch release. See
[Cache versioning](../../concepts/cache.md#cache-versioning) for more.

## Lockfile versioning

The `uv.lock` schema version is considered part of the public API, and so will only be incremented
in a minor release as a breaking change. See
[Lockfile versioning](../../concepts/resolution.md#lockfile-versioning) for more.