0.12.21

Release Notes

Released on 2026-09-29.

Python

• Update CPython to use OpenSSL 3.5.9 (#22076)

Enhancements

• Omit empty [manifest] tables from lockfiles that contain only manifest subtables (#22070)

Preview features

• Omit redundant runtime constraints from uv.lock, including those involving pre-releases, with the resolution-inputs preview feature (#22004, #22068)

Bug fixes

• Prevent uv python pin --rm from removing a global .python-versions file without --global (#21992)
• Fix installed-package checks incorrectly reporting post-releases as incompatible with exclusive lower bounds on pre-releases (#22049)

Install uv 0.12.21

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/uv/releases/download/0.12.21/uv-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/uv/releases/download/0.12.21/uv-installer.ps1 | iex"

Download uv 0.12.21

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  --repo astral-sh/uv

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

gh attestation verify  --bundle