uv 0.12.18

on Python PyPI

Release Notes

Released on 2026-09-22.

Enhancements

• Add --output-format json to uv pip install and uv pip sync, including for --dry-run and --check (#21893)
• Add --check to uv pip install and uv pip sync to report planned changes without modifying the environment (#21844)
• Identify failures from get_requires_for_build_* hooks correctly in build errors (#21881)

Preview features

• Validate build requirements for uv build --no-build-isolation with --preview-features build-dependency-check; use --skip-dependency-check to opt out (#21880)

Performance

• Speed up uv_build editable wheel creation by omitting compression from temporary wheels (#21918)

Bug fixes

• Select package versions with wheels compatible with each Python resolution fork, correctly interpreting generic and stable-ABI wheel tags (#21835, #21836)
• Restore project, script, and lock files when uv add, uv remove, or uv version fails or is interrupted (#21860, #21856)
• Use configured dependency-metadata when checking whether installed requirements are satisfied (#21843)
• Reject archive entries that normalize to absolute Windows paths (#21923)
• Recognize distribution filenames and archive extensions when URL fragments contain ? (#21920)
• Generate correctly lowercased platform tags for BSD and Haiku releases (#21853)
• Avoid rebuilding a Windows relative path into an absolute form (#21923)

Install uv 0.12.18

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/uv/releases/download/0.12.18/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/uv/releases/download/0.12.18/uv-installer.ps1 | iex"

Download uv 0.12.18

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>