0.12.19

Name: uv
Author: astral-sh

astral-sh/uv0.12.19Sep 25, 2026by astral-releases-bot[bot]

Upgrading?

What changed from 0.12.18 → 0.12.19?What's new in 0.12.20 after 0.12.19?

AI Summary

This release adds support for newer Python versions including PyPy 3.11.16 and 3.12.14, and GraalPy 3.13.0. It introduces preview features for lazy imports in build backends and resolution input handling. Additionally, it fixes issues with package reinstalling due to signed query parameters and marker parsing.

Key Highlights

Added support for PyPy 3.11.16 and 3.12.14.
Updated GraalPy 3.13.0 to build 25.4.4.
Preview feature: Build-backend lazy imports on CPython 3.15+.
Preview feature: Omit unused resolution settings from `uv.lock`.
Fix to preserve signed query parameters to prevent unnecessary package reinstalls.

New Features

Support for PyPy 3.11.16 and 3.12.14.
Update GraalPy 3.13.0 to build 25.4.4.
Preview feature: `build-lazy-imports` for CPython 3.15+.
Preview feature: `resolution-inputs` to ignore changes to unused resolution settings in lockfiles.
Rust API: Restored public `FlatDistributions` export.

Full Release Notes

## Release Notes

Released on 2026-09-24.

### Python

- Add PyPy 3.11.16 and 3.12.14 ([#21847](https://github.com/astral-sh/uv/pull/21847))
- Update GraalPy 3.13.0 to build 25.4.4 ([#21847](https://github.com/astral-sh/uv/pull/21847))

### Enhancements

- Format upload URLs with backticks in `uv publish` errors ([#21934](https://github.com/astral-sh/uv/pull/21934))

### Preview features

- Run build-backend hooks with lazy imports on CPython 3.15 and later using the `build-lazy-imports` preview feature ([#21967](https://github.com/astral-sh/uv/pull/21967))
- Omit unused resolution settings from `uv.lock` and ignore changes to them when checking lockfile freshness with the `resolution-inputs` preview feature ([#21913](https://github.com/astral-sh/uv/pull/21913))

### Bug fixes

- Preserve signed and encoded query parameters in direct-URL metadata to avoid reinstalling unchanged packages ([#21971](https://github.com/astral-sh/uv/pull/21971))
- Recognize `1.0.0` as satisfying `===1` during installed-package checks, matching resolution ([#21931](https://github.com/astral-sh/uv/pull/21931))
- Avoid collisions between Git checkout readiness markers and `.ok` files in dependencies ([#21891](https://github.com/astral-sh/uv/pull/21891))
- Preserve always-false `python_version` markers when parsing their serialized form ([#21939](https://github.com/astral-sh/uv/pull/21939))

### Rust API

- Restore the public `FlatDistributions` export and its `BTreeMap` conversion for downstream resolvers ([#21965](https://github.com/astral-sh/uv/pull/21965))

### Documentation

- Make individual preview-feature reference entries linkable by name ([#21950](https://github.com/astral-sh/uv/pull/21950))

## Install uv 0.12.19

### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-installer.sh | sh
```

### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-installer.ps1 | iex"
```

## Download uv 0.12.19

|  File  | Platform | Checksum |
|--------|----------|----------|
| [uv-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-apple-darwin.tar.gz.sha256) |
| [uv-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-apple-darwin.tar.gz.sha256) |
| [uv-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-pc-windows-msvc.zip.sha256) |
| [uv-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-pc-windows-msvc.zip.sha256) |
| [uv-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-pc-windows-msvc.zip.sha256) |
| [uv-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [uv-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-unknown-linux-gnu.tar.gz.sha256) |
| [uv-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-powerpc64le-unknown-linux-gnu.tar.gz.sha256) |
| [uv-riscv64gc-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-riscv64gc-unknown-linux-gnu.tar.gz.sha256) |
| [uv-s390x-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-s390x-unknown-linux-gnu.tar.gz.sha256) |
| [uv-x86_64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-unknown-linux-gnu.tar.gz.sha256) |
| [uv-armv7-unknown-linux-gnueabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-armv7-unknown-linux-gnueabihf.tar.gz.sha256) |
| [uv-aarch64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-aarch64-unknown-linux-musl.tar.gz.sha256) |
| [uv-i686-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-i686-unknown-linux-musl.tar.gz.sha256) |
| [uv-riscv64gc-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-riscv64gc-unknown-linux-musl.tar.gz) | RISCV MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-riscv64gc-unknown-linux-musl.tar.gz.sha256) |
| [uv-x86_64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-x86_64-unknown-linux-musl.tar.gz.sha256) |
| [uv-arm-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-arm-unknown-linux-musleabihf.tar.gz.sha256) |
| [uv-armv7-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/uv/releases/download/0.12.19/uv-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://releases.astral.sh/github/uv/releases/download/0.12.19/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>
```

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