v0.15.19

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Released on 2026-06-23.

Preview features

• Support human-readable names when hovering suppression comments and in code actions (#​26114)

Bug fixes

• Fall back to default settings when editor-only settings are invalid (#​26244)
• Fix panic when inserting text at a notebook cell boundary (#​26111)

Rule changes

• [pylint] Update fix suggestions for __floor__, __trunc__, __length_hint__, and __matmul__ variants (PLC2801) (#​26239)

Performance

• Avoid allocating when parsing single string literals (#​26200)
• Avoid reallocating singleton call arguments (#​26223)
• Lazily create source files for lint diagnostics (#​26226)
• Optimize formatter text width and indentation (#​26236)
• Reserve capacity for builtin bindings (#​26229)
• Skip repeated-key checks for singleton dictionaries (#​26228)
• Use ArrayVec for qualified name segments (#​26224)

Documentation

• [flake8-pyi] Note that PYI051 is an opinionated stylistic rule (#​26179)
• [pyupgrade] Clarify UP029 as a Python 2 compatibility rule (#​26243)

Other changes

• Publish Ruff crates to crates.io (#​26271)

Contributors

• @​MakenRosa
• @​MichaReiser
• @​trilamsr
• @​ntBre
• @​sanjibani
• @​charliermarsh

v0.15.18

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Released on 2026-06-18.

Preview features

• Handle nested ruff:ignore comments (#​25791)
• Stop displaying severity in output (#​26050)
• Use human-readable names in CLI output (#​25937)
• Use human-readable names in LSP and playground diagnostics (#​26058)
• [pydocstyle] Prevent property docstrings starting with verbs (D421) (#​23775)
• [flake8-pyi] Extend PYI033 to Python files (#​26129)

Bug fixes

• Detect equivalent numeric mapping keys (#​26009)
• Detect mapping keys equivalent to booleans (#​25982)
• Detect repeated signed and complex dictionary keys (#​26007)

Rule changes

• [flake8-pyi] Rename PYI033 to legacy-type-comment (#​26131)

Performance

• Use ThinVec for call keywords (#​25999)
• Inline parser recovery context checks (#​26038)
• Match parser keywords as bytes (#​26037)
• Move value parsing out of lexing (#​25360)

Server

• Render subdiagnostics and secondary annotations as related information (#​26011)

Documentation

• Update fix availability for always-fixable rules (#​26091)
• [flake8-tidy-imports] Add fix safety section (TID252) (#​17491)

Parser

• Reject __debug__ lambda parameters (#​26022)
• Reject _ as a match-pattern target (#​25977)
• Reject multiple starred names in sequence patterns (#​25976)
• Reject parenthesized star imports (#​26021)
• Reject starred comprehension targets (#​26023)
• Reject unparenthesized generator expressions in class bases (#​25978)
• Reject yield expressions after commas (#​26024)
• Validate function type parameter default order (#​25981)

Playground

• Make diagnostic links clickable (#​26104)
• Use diagnostic tags (#​26105)

Contributors

• @​AlexWaygood
• @​ntBre
• @​gtkacz
• @​MichaReiser
• @​charliermarsh
• @​Kalmaegi

v0.15.17

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Released on 2026-06-11.

Preview features

• Allow human-readable names in suppression comments (#​25614)
• Fix handling of ignore comments within a disable/enable pair (#​25845)
• Prioritize human-readable names in CLI output (#​25869)
• Respect diagnostic start and parent ranges and trailing comments in ruff:ignore suppressions (#​25673)
• [flake8-async] Add trio.as_safe_channel to safe decorators (ASYNC119) (#​25775)
• [flake8-pytest-style] Also check pytest_asyncio fixtures (#​25375)
• [ruff] Ban pytest autouse fixtures (RUF076) (#​25477)
• [pyupgrade] Add from __future__ import annotations automatically (UP007, UP045) (#​23259)

Bug fixes

• Fix diagnostic when ruff:enable or ruff:disable appears where ruff:ignore is expected (#​25700)
• [pyupgrade] Preserve leading empty literals to avoid syntax errors (UP032) (#​25491)

Rule changes

• [flake8-pytest-style] Clarify diagnostic message for single parameters (PT007) (#​25592)
• [numpy] Drop autofix for np.in1d (NPY201) (#​25612)
• [pylint] Exempt Python version comparisons (PLR2004) (#​25743)

Performance

• Reserve AST Vecs with correct capacity for common cases (#​25451)

Formatter

• Preserve whitespace for Quarto cell option comments (#​25641)

CLI

• Allow rule names in ruff rule (#​25640)

Other changes

• Fix playground diagnostics scrollbars (#​25642)

Contributors

• @​SuryanshSS1011
• @​anishgirianish
• @​romero-deshaw
• @​karlhillx
• @​carljm
• @​ntBre
• @​11happy
• @​Kilo59
• @​oconnor663
• @​LeonidasZhak
• @​DavisVaughan
• @​MeGaGiGaGon
• @​jonathandung
• @​MichaReiser
• @​brianmego

v0.15.16

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Released on 2026-06-04.

Preview features

• [flake8-async] Implement yield-in-context-manager-in-async-generator (ASYNC119) (#​24644)
• [pylint] Narrow diagnostic range and exclude cases without exception handlers (PLW0717) (#​25440)
• [ruff] Treat yield before break from a terminal loop as terminal (RUF075) (#​25447)

Bug fixes

• [eradicate] Avoid flagging ruff:ignore comments as code (ERA001) (#​25537)
• [eradicate] Fix ERA001/RUF100 conflict when noqa is on commented-out code (#​25414)
• [pyflakes] Avoid removing the format call when it would change behavior (F523) (#​25320)
• [pylint] Avoid syntax errors in invalid character replacements in f-strings before Python 3.12 (PLE2510, PLE2512, PLE2513, PLE2514, PLE2515) (#​25544)
• [pyupgrade] Avoid converting format calls with more kinds of side effects (UP032) (#​25484)

Rule changes

• [flake8-pytest-style] Avoid fixes for ambiguous argnames and argvalues combinations (PT006) (#​24776)

Performance

• Drop excess capacity from statement suites during parsing (#​25368)

Documentation

• [pydocstyle] Improve discoverability of rules enabled for each convention (#​24973)
• [ruff] Restore example code for Python versions before 3.15 (RUF017) (#​25439)
• Fix typo bin/active → bin/activate in tutorial (#​25473)

Other changes

• Shrink additional parser AST collections (#​25465)

Contributors

• @​Redslayer112
• @​koriyoshi2041
• @​George-Ogden
• @​TejasAmle
• @​anishgirianish
• @​ntBre
• @​MichaReiser
• @​loganrosen
• @​RafaelJohn9
• @​adityasingh2400

v0.15.15

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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

v0.15.14

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Released on 2026-05-21.

Preview features

• [airflow] Implement airflow-task-implicit-multiple-outputs (AIR202) (#​25152)
• [flake8-use-pathlib] Mark PTH101 fix as unsafe when first argument is a class attribute annotated as int (#​25086)
• [pylint] Implement too-many-try-statements (W0717) (#​23970)
• [ruff] Add incorrect-decorator-order (RUF074) (#​23461)
• [ruff] Add fallible-context-manager (RUF075) (#​22844)

Bug fixes

• Fix lambda formatting in interpolated string expressions (#​25144)
• Treat generic frozenset annotations as immutable (#​25251)
• [flake8-type-checking] Avoid strict behavior when future-annotations are enabled (TC001, TC002, TC003) (#​25035)
• [pylint] Avoid false positives in else clause (PLR1733) (#​25177)

Rule changes

• [flake8-comprehensions] Skip C417 for lambdas with positional-only parameters (#​25272)
• [flake8-simplify] Preserve f-string source verbatim in SIM101 fix (#​25061)

Performance

• Avoid unnecessary parser lookahead for operators (#​25290)

Documentation

• Update code example setting Neovim LSP log level (#​25284)

Other changes

• Add full PEP 798 support (#​25104)
• Add a parser recursion limit (#​24810)
• Update various ruff_python_stdlib APIs (#​25273)

Contributors

• @​ocaballeror
• @​lerebear
• @​samuelcolvin
• @​baltasarblanco
• @​aconal-com
• @​anishgirianish
• @​JelleZijlstra
• @​AlexWaygood
• @​ntBre
• @​adityasingh2400
• @​charliermarsh
• @​Dev-iL
• @​neutrinoceros
• @​shivamtiwari3
• @​Dev-X25874