Sourced from ruff's releases.

0.15.2

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:

  
  # 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

... (truncated)

Sourced from ruff's changelog.

0.15.2

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!

... (truncated)

• 9d18ee9 Hard code workflow name and cancel-in-progress only for PRs (#23431)
• 7cc15f0 Bump 0.15.2 (#23430)
• d1b5443 Add extension mapping to configuration file options (#23384)
• 222574a Expand the default rule set (#23385)
• 1465b5d [flake8-async] Fix in_async_context logic (#23426)
• 410902f [pyupgrade] Fix handling of typing.{io,re} (UP035) (#23131)
• 729610a [ty] Fall back to ambiguous for large control flow graphs (#23399)
• 1425c18 [ty] Add code folding support
• 97acaae [ty] Fix stack overflow for self-referential TypeOf in annotations (#23407)
• 1f380c8 [ty] Update tests reveal_type and Never (#23418)
• Additional commits viewable in compare view

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