astral-sh/ruff 0.15.15

on GitHub

Release Notes

Released on 2026-05-28.

Preview features

• Fix Markdown closing fence handling (#25310)
• [pyflakes] Report duplicate imports in typing.TYPE_CHECKING block (F811) (#22560)

Bug fixes

• [pyflakes] Treat function-scope bare annotations as locals per PEP 526 (F821) (#21540)

Performance

• Avoid redundant TokenValue drops in the lexer (#25300)
• Reduce memory usage by dropping token-excess capacity and improve performance by approximating the initial tokens Vec size (#25354)
• Use ThinVec in AST to shrink Stmt (#25361)

Documentation

• Fix line-length example for --config option (#25389)
• [flake8-comprehensions] Document RecursionError edge case in __len__ (C416) (#25286)
• [mccabe] Improve example (C901) (#25287)
• [pyupgrade] Clarify fix safety docs (UP007, UP045) (#25288)
• [refurb] Document FURB192 exception change for empty sequences (#25317)
• [ruff] Document false negative for user-defined types (RUF013) (#25289)

Formatter

• Fix formatting of lambdas nested within f-strings (#25398)

Server

• Return code action for codeAction/resolve requests that contain no or no valid URL (#25365)

Other changes

• Expand semantic syntax errors for invalid walruses (#25415)

Contributors

• @chirizxc
• @ntBre
• @adityasingh2400
• @charliermarsh
• @fallintoplace
• @martin-schlossarek
• @MichaReiser
• @Ruchir28

Install ruff 0.15.15

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-installer.ps1 | iex"

Download ruff 0.15.15

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>