0.13.1

## Release Notes

Released on 2026-10-14.

### Enhancements

- Ignore `Requires-Python` upper bounds in `uv pip check` and `uv pip install --strict`, consistent with resolution ([#22500](https://github.com/astral-sh/uv/pull/22500))
- Support Linux SPARC by falling back when filesystem cloning and detailed cache accounting are unavailable ([#22463](https://github.com/astral-sh/uv/pull/22463))
- Report missing trusted hashes in resolution errors ([#22241](https://github.com/astral-sh/uv/pull/22241))

### Python

- Add CPython 3.16.0a1 ([#22527](https://github.com/astral-sh/uv/pull/22527))

### Preview features

- Allow `uv tool upgrade` to upgrade installed tools when `tool-install-locks` is enabled ([#22498](https://github.com/astral-sh/uv/pull/22498))
- Add preliminary support for parsing PEP 825 variant labels in wheel filenames with `wheel-variants` ([#22039](https://github.com/astral-sh/uv/pull/22039))

### Performance

- Reduce uv's binary size ([#22429](https://github.com/astral-sh/uv/pull/22429), [#22430](https://github.com/astral-sh/uv/pull/22430), [#22432](https://github.com/astral-sh/uv/pull/22432))
- Speed up Simple API parsing ([#22429](https://github.com/astral-sh/uv/pull/22429))
- Reduce package metadata parsing overhead ([#22239](https://github.com/astral-sh/uv/pull/22239))

### Bug fixes

- Prevent tool and managed Python uninstalls from deleting unrelated files beside their storage directories ([#22495](https://github.com/astral-sh/uv/pull/22495))
- Restore support for source distributions containing hard links or full-length tar user or group names ([#22516](https://github.com/astral-sh/uv/pull/22516), [#22522](https://github.com/astral-sh/uv/pull/22522))
- Preserve device files and FIFOs used as `uv pip compile` or `uv export` output destinations ([#22496](https://github.com/astral-sh/uv/pull/22496))
- Fix `sys._base_executable` detection for environments created from symlinked interpreters ([#22520](https://github.com/astral-sh/uv/pull/22520))
- Prevent concurrent readers from observing partially written lockfiles, Python version files, or managed Python sysconfig files ([#22399](https://github.com/astral-sh/uv/pull/22399), [#22402](https://github.com/astral-sh/uv/pull/22402), [#22403](https://github.com/astral-sh/uv/pull/22403))
- Serialize concurrent project commands that reach the same environment through real and symlinked paths ([#22390](https://github.com/astral-sh/uv/pull/22390))
- Prevent installs, syncs, and environment creation from failing when they race with `uv cache clean` ([#22387](https://github.com/astral-sh/uv/pull/22387))
- Prevent concurrent tool installations from corrupting an environment when the last tool is uninstalled ([#22391](https://github.com/astral-sh/uv/pull/22391))
- Persist changed upgrade settings even when `uv tool upgrade` leaves the tool version unchanged ([#22499](https://github.com/astral-sh/uv/pull/22499))
- Reuse environments with installed Git dependencies pinned to full commit hashes without resolving again ([#22464](https://github.com/astral-sh/uv/pull/22464))

### Documentation

- Explain how to select an emulated Python interpreter on Windows ARM64 when native wheels are unavailable ([#22424](https://github.com/astral-sh/uv/pull/22424))
- Fix the `.netrc` format documentation link ([#22514](https://github.com/astral-sh/uv/pull/22514))

### Other changes

- Publish Python 3.15-based uv Docker images under stable tags ([#22503](https://github.com/astral-sh/uv/pull/22503))

## Install uv 0.13.1

### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-installer.sh | sh
```

### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-installer.ps1 | iex"
```

## Download uv 0.13.1

|  File  | Platform | Checksum |
|--------|----------|----------|
| [uv-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-apple-darwin.tar.gz.sha256) |
| [uv-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-apple-darwin.tar.gz.sha256) |
| [uv-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-pc-windows-msvc.zip.sha256) |
| [uv-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-pc-windows-msvc.zip.sha256) |
| [uv-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-pc-windows-msvc.zip.sha256) |
| [uv-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [uv-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-unknown-linux-gnu.tar.gz.sha256) |
| [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) |
| [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) |
| [uv-s390x-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-s390x-unknown-linux-gnu.tar.gz.sha256) |
| [uv-x86_64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-unknown-linux-gnu.tar.gz.sha256) |
| [uv-armv7-unknown-linux-gnueabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-armv7-unknown-linux-gnueabihf.tar.gz.sha256) |
| [uv-aarch64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-aarch64-unknown-linux-musl.tar.gz.sha256) |
| [uv-i686-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-i686-unknown-linux-musl.tar.gz.sha256) |
| [uv-riscv64gc-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-riscv64gc-unknown-linux-musl.tar.gz) | RISCV MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-riscv64gc-unknown-linux-musl.tar.gz.sha256) |
| [uv-x86_64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-x86_64-unknown-linux-musl.tar.gz.sha256) |
| [uv-arm-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) |
| [uv-armv7-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.13.1/uv-armv7-unknown-linux-musleabihf.tar.gz.sha256) |

## Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify):
```sh
gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv
```

You can also download the attestation from [GitHub](https://github.com/astral-sh/uv/attestations) and verify against that directly:
```sh
gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>
```