astral-sh/ruff 0.16.3

on GitHub

Release Notes

Released on 2026-08-13.

Preview features

• [pylint] Fix false negatives on negative numbers (PLR6104) (#27251)
• [pyupgrade] Add rule to replace while 1 with while True (UP048) (#27190)

Bug fixes

• [flake8-bandit] Also check keyword arguments (S602, S603, S607, S609) (#27687)
• [pylint] Allow continue in finally on Python 3.8 (#27626)
• [pylint] Fix PLE1307 false positive with bools (#27651)
• [pylint] Fix false positives and negatives with %b format character (PLE1300, PLE1307) (#27560)
• [pylint] Improve handling of concatenated strings (PLE1300) (#27659)

Rule changes

• [numpy] Make np.chararray autofix backwards-compatible (NPY201) (#27527)

Performance

• Enable PGO for Linux x86-64 Ruff releases (#27570)
• Enable PGO for Linux ARM64 Ruff releases (#27574)
• Enable PGO for Windows x86-64 Ruff releases (#27573)
• Enable PGO for macOS ARM64 Ruff releases (#27572)
• Reduce Expr size to 64 bytes (#27591)

CLI

• Hyperlink rule codes in ruff check --statistics output (#27646)

Documentation

• [ruff] Also suggest asyncio.TaskGroup (RUF006) (#27461)

Other changes

• Use mimalloc v3 (#27586)

Contributors

• @Andrej730
• @alonfaraj
• @romero-deshaw
• @Avasam
• @tjkuson
• @charliermarsh
• @chirizxc
• @saberoueslati
• @MichaReiser

Install ruff 0.16.3

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-installer.ps1 | iex"

Download ruff 0.16.3

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/ruff

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>