uv 0.12.19

on Python PyPI

Release Notes

Released on 2026-09-24.

Python

• Add PyPy 3.11.16 and 3.12.14 (#21847)
• Update GraalPy 3.13.0 to build 25.4.4 (#21847)

Enhancements

• Format upload URLs with backticks in uv publish errors (#21934)

Preview features

• Run build-backend hooks with lazy imports on CPython 3.15 and later using the build-lazy-imports preview feature (#21967)
• Omit unused resolution settings from uv.lock and ignore changes to them when checking lockfile freshness with the resolution-inputs preview feature (#21913)

Bug fixes

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

Rust API

• Restore the public FlatDistributions export and its BTreeMap conversion for downstream resolvers (#21965)

Documentation

• Make individual preview-feature reference entries linkable by name (#21950)

Install uv 0.12.19

Install prebuilt binaries via shell script

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

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

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:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/uv

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>