Sourced from ruff's releases.

0.15.15

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

... (truncated)

Sourced from ruff's changelog.

0.15.15

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

... (truncated)

• db5aa0a Bump 0.15.15 (#25431)
• 366fe21 [ty] Improve diagnostics for syntax errors in forward annotations (#25158)
• e2e1e64 [ty] Remove excess capacity from more Salsa cached collections (#25411)
• 1bd77e1 [ty] Use diagnostic message as tie breaker when sorting (#25424)
• 7e1bc1e Add agent skills for working on ty (#25422)
• 574e107 Expand semantic syntax errors for invalid walruses (#25415)
• 4a7ca06 [ty] Display docs for matching parameter when hovering over the name of an ar...
• 5432709 Refine a few agents instructions (#25423)
• 3cb09eb [ty] Support typing.TypeForm (#25334)
• c8cd59f [ty] Infer class attributes assigned by metaclass initialization (#25342)
• Additional commits viewable in compare view