v0.15.2

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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:

  # 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