Release Notes

Released on 2026-02-19.

Preview features

• Expand the default rule set (#23385)

  In preview, Ruff now enables a significantly expanded default rule set of 412 rules, up from the stable default set of 59 rules. The new rules are mostly a superset of the stable defaults, with the exception of these rules, which are removed from the preview defaults:

  • multiple-imports-on-one-line (E401)
  • module-import-not-at-top-of-file (E402)
  • module-import-not-at-top-of-file (E701)
  • multiple-statements-on-one-line-semicolon (E702)
  • useless-semicolon (E703)
  • none-comparison (E711)
  • true-false-comparison (E712)
  • not-in-test (E713)
  • not-is-test (E714)
  • type-comparison (E721)
  • lambda-assignment (E731)
  • ambiguous-variable-name (E741)
  • ambiguous-class-name (E742)
  • ambiguous-function-name (E743)
  • undefined-local-with-import-star (F403)
  • undefined-local-with-import-star-usage (F405)
  • undefined-local-with-nested-import-star-usage (F406)
  • forward-annotation-syntax-error (F722)

  If you use preview and prefer the old defaults, you can restore them with configuration like:

  ```toml

  ruff.toml

  [lint] select = ["E4", "E7", "E9", "F"]

  pyproject.toml

  [tool.ruff.lint] select = ["E4", "E7", "E9", "F"] ```

  If you do give them a try, feel free to share your feedback in the GitHub discussion!

• [flake8-pyi] Also check string annotations (PYI041) (#19023)

Bug fixes

• [flake8-async] Fix in_async_context logic (#23426)
• [ruff] Fix for RUF102 should delete entire comment (#23380)
• [ruff] Suppress diagnostic for strings with backslashes in interpolations before Python 3.12 (RUF027) (#21069)
• [flake8-bugbear] Fix B023 false positive for immediately-invoked lambdas (#23294)
• [parser] Fix false syntax error for match-like annotated assignments (#23297)
• [parser] Fix indentation tracking after line continuations (#23417)

Rule changes

• [flake8-executable] Allow global flags in uv shebangs (EXE003) (#22582)
• [pyupgrade] Fix handling of typing.{io,re} (UP035) (#23131)
• [ruff] Detect PLC0207 on chained str.split() calls (#23275)

CLI

• Remove invalid inline noqa warning (#23270)

Configuration

• Add extension mapping to configuration file options (#23384)

Documentation

• Add Q004 to the list of conflicting rules (#23340)
• [ruff] Expand lint.external docs and add sub-diagnostic (RUF100, RUF102) (#23268)

Contributors

• @dylwil3
• @Jkhall81
• @danparizher
• @dhruvmanila
• @harupy
• @ngnpope
• @amyreese
• @kar-ganap
• @robsdedude
• @shaanmajid
• @ntBre
• @toslunar

Install ruff 0.15.2

Install prebuilt binaries via shell script

:::sh
curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ruff/releases/download/0.15.2/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

:::sh
powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ruff/releases/download/0.15.2/ruff-installer.ps1 | iex"

Download ruff 0.15.2

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:

:::sh
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:

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