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Changelog

0.16.8

Released on 2026-09-16.

Bug fixes

  • Visit functional TypedDict keyword arguments correctly (#28584)
  • [flake8-simplify] Detect nested async with under sync parent (SIM117) (#27821)
  • [flake8-simplify] Preserve operand order in SIM109 fix (#27824)
  • [pyupgrade] Preserve required parentheses in multiline UP040 fixes (#28164)
  • [pyupgrade] Skip TypeVarTuple and ParamSpec conversions with bounds or constraints (UP040, UP046, UP047) (#28505)

Rule changes

  • Add support for __lazy_modules__ (#28459)
  • Recognize PEP-728 TypedDict class keywords (#28533)
  • Recognize quoted types in typing.TypeForm (#28507)
  • Support conditional assignment to __lazy_modules__ (#28491)
  • [flake8-type-checking] Prefer lazy imports over TYPE_CHECKING on Python 3.15 and later (TC001, TC002, TC003) (#28541)
  • [pyupgrade] Make the fix for UP040 always unsafe (#28526)
  • [pyupgrade] Stop recommending deprecated ByteString aliases (UP035) (#28498)
  • [ruff, flake8-use-pathlib] Recognize the parent_mode argument (RUF064, PTH103) (#28528)
  • [ruff] Detect \Z in pytest.raises() match patterns (RUF043) (#28598)

CLI

  • Use rule name and code in formatter incompatibility warnings (#28571)

Configuration

  • [flake8-tidy-imports] Add extend-banned-api (#28644)

Contributors

0.16.7

Released on 2026-09-10.

Preview features

  • [ruff] Add rule for default values on method receivers (RUF077) (#26700)
  • [ruff] Recognize re.prefixmatch (RUF039, RUF055) (#28311)

Bug fixes

  • Alternate nested quotes inside format spec interpolations (#28259)
  • [flake8-implicit-str-concat] Mark fix unsafe when it creates a docstring (ISC003) (#27981)
  • [flake8-tidy-imports] Skip fixes for multi-member imports (TID254) (#26584)
  • [pylint] Gate ImportCycleError on Python 3.15 (PLW0133) (#28310)

Rule changes

  • Correct D211 and D203 rule conflict diagnostic (#28444)
  • Recognize slice and frozendict generics (#28477)
  • Stop defining __cached__ for Python 3.15 (#28476)
  • [pyupgrade] Stop recommending removed typing.no_type_check_decorator (UP035) (#28475)

Performance

  • Reuse parser name lookups when interning (#28399)
  • Speed up inherited configuration resolution (#28299)

Documentation

  • Fix line-length path in --config example (#28392)
  • Remove the "Who’s Using Ruff?" list (#28455)

Other changes

  • Embed archive checksums in the shell installer (#28281)

Contributors

0.16.6

Released on 2026-09-03.

Preview features

  • Move pytest-fixture-autouse to the restriction category (#28219)
  • [flake8-pytest-style] Add an autofix for PT020 (#27993)
  • [flake8-tidy-imports] Prevent fix loop between TID254 and TID255 (#28262)
  • [isort] Exclude pragma comments from line length calculation (I001) (#27313)

Bug fixes

  • Validate unary expressions when parsing (#28233)
  • [flake8-async, pylint] Recognize builtins.open (ASYNC230, PLW1514) (#28021)
  • [flake8-bugbear] Fix panic on match subjects (B031) (#27781)
  • [flake8-datetimez] Reject tzinfo=None for datetime bounds (DTZ901) (#28022)
  • [flake8-pytest-style] Avoid duplicate PT017 diagnostics (#27918)
  • [ruff] Remove lint.external hint for Ruff-specific suppressions (RUF102) (#27923)

Rule changes

  • [flake8-use-pathlib] Add display-only fix for os.listdir (PTH208) (#28027)

Documentation

  • Add another example and glob reference for lint.per-file-ignores (#28106)
  • Add duplicate work guidance (#28229)
  • [flake8-async] Document thread offloading (ASYNC240) (#28008)
  • [pyupgrade] Clarify default encoding argument handling (UP012) (#27315)

Other changes

  • Allow unary plus in match patterns on Python 3.15 (#28231)

Contributors

0.16.5

Released on 2026-08-27.

Preview features

  • Allow rules without codes (#28049)
  • Introduce category selectors (#27666)
  • Update preview default rules and categories (#27877)

Bug fixes

  • [flake8-async] Detect blocking generic HTTP requests (ASYNC210) (#28024)
  • [flake8-datetimez] Allow timezone-safe strptime chains (DTZ007) (#28023)
  • [flake8-simplify] Respect side effects in lambda defaults (SIM401) (#28000)

Server

  • Fix duplicated "of" in ClientOptions doc comment (#27978)

Documentation

  • Document rule acceptance guidelines (#27910)
  • Document the new category selectors (#27906)

Contributors

0.16.4

Released on 2026-08-20.

Preview features

  • [flake8-use-pathlib] Add autofix for PTH116 (#26460)
  • [refurb] Restrict delete-full-slice to lists (FURB131) (#27711)
  • [refurb] Skip FURB101 and FURB103 when the open argument is a file descriptor (#27643)

Bug fixes

  • Fix InvalidInstruction on Windows CPUs that do not support POPCNT (#27803)
  • [pyflakes] Emit semantic syntax errors in string type definitions as F722 (#27835)
  • [pylint] Allow os._exit imports in import-private-name (PLC2701) (#27738)

Rule changes

  • [syntax-errors] Align mixed t-string/bytes error message with CPython 3.14 (#27766)
  • [ruff] Add ctypes.LittleEndianStructure and related types to existing exception (RUF012) (#27753)
  • [syntax-errors] Detect duplicate keyword arguments (#17804)
  • [syntax-errors] Detect parameters declared nonlocal (#27628)

Server

  • Offer display-only fixes and mark safe fixes preferred (#27807)
  • Support pull diagnostics for notebook cells (#27779)

Documentation

  • Add default indicator to rules table (#27724)
  • Fix broken link to Python docs (#27757)

Other changes

  • Fix s390x stacker assembly in release builds (#27776)
  • Guarantee minimum stack size when parsing a module, standalone expression, and suites (#25464)
  • Reduce configuration deserialization code size (#27924)
  • Check packed AST index bounds (#27849)

Contributors

0.16.3

Released on 2026-08-13.

Preview features

  • [pylint] Fix false negatives on negative numbers (PLR6104) (#27251)
  • [pyupgrade] Add rule to replace while 1 with while True (UP048) (#27190)

Bug fixes

  • [flake8-bandit] Also check keyword arguments (S602, S603, S607, S609) (#27687)
  • [pylint] Allow continue in finally on Python 3.8 (#27626)
  • [pylint] Fix PLE1307 false positive with bools (#27651)
  • [pylint] Fix false positives and negatives with %b format character (PLE1300, PLE1307) (#27560)
  • [pylint] Improve handling of concatenated strings (PLE1300) (#27659)

Rule changes

  • [numpy] Make np.chararray autofix backwards-compatible (NPY201) (#27527)

Performance

  • Enable PGO for Linux x86-64 Ruff releases (#27570)
  • Enable PGO for Linux ARM64 Ruff releases (#27574)
  • Enable PGO for Windows x86-64 Ruff releases (#27573)
  • Enable PGO for macOS ARM64 Ruff releases (#27572)
  • Reduce Expr size to 64 bytes (#27591)

CLI

  • Hyperlink rule codes in ruff check --statistics output (#27646)

Documentation

  • [ruff] Also suggest asyncio.TaskGroup (RUF006) (#27461)

Other changes

Contributors

0.16.2

Released on 2026-08-06.

Bug fixes

  • [flake8-pyi] Avoid false positives on singledispatch functions (PYI041) (#27335)

Server

  • Register formatting capabilities dynamically to exclude TOML files (#27332)

Contributors

0.16.1

Released on 2026-07-30.

Preview features

  • Add an option to opt out of human-readable names (#27160)
  • [flake8-pytest-style] Make fixes safe by default and unsafe only when comments are present (PT018) (#27201)
  • [pyupgrade] Skip fix when a defaulted TypeVar precedes a non-defaulted one (UP040, UP046, UP047) (#27133)
  • [ruff] Fix false positive with unpacked arguments (RUF065) (#26959)

Bug fixes

  • Bump gen-lsp-types to gracefully handle unknown enumeration values in LSP messages (#27230)
  • [flake8-bugbear] Mark range as immutable (B008) (#27247)
  • [flake8-comprehensions] NFKC-normalize keyword names in C408 fix (#26813)
  • [flake8-return] Fix false positive when variable is read in finally clause (RET504) (#25441)
  • [pydocstyle] Skip section detection inside RST directive bodies (D214, D405, D413) (#23635)
  • [refurb] Parenthesize yield arguments in the FURB192 fix (#27192)

Rule changes

  • [flake8-pytest-style] Mark PT022 fixes as unsafe (#26440)
  • [refurb] Mark fixes that remove unknown separators as unsafe (FURB105) (#27200)

Server

  • Fix indexing of excluded nested Ruff workspaces (#27303)
  • Lint TOML files in the LSP (#26862)

Documentation

  • Cover pycon Markdown formatting (#27153)
  • [flake8-bandit] Document TYPE_CHECKING exception (S101) (#27004)
  • [flake8-import-conventions] Document that extend-aliases can override default aliases (#27191)
  • [pylint] Add missing fix safety gotchas for non-augmented-assignment (PLR6104) (#27250)

Other changes

  • Reduce syntax error noise by swallowing dedents like indents (#27170)
  • Vendor latest annotate-snippets (#27033)

Contributors

0.16.0

Released on 2026-07-23.

Check out the blog post for a migration guide and overview of the changes!

Breaking changes

  • Ruff now enables a much larger set of rules by default (413, up from 59). See the blog post for more details and the new Default Rules page for a full listing of the enabled rules. Note that this is primarily an expansion, but 18 of the more opinionated pycodestyle (E) and pyflakes (F) rules have been removed from the default set: E401, E402, E701, E702, E703, E711, E712, E713, E714, E721, E731, E741, E742, E743, F403, F405, F406, and F722.

  • Ruff can now format Python code blocks in Markdown files and will do this by default. See the documentation for more details.

  • Ruff now supports ruff: ignore comments at the ends of lines, like noqa comments, or on the line preceding a diagnostic. For example, these both suppress an unused-import (F401) diagnostic:

    import math  # ruff: ignore[F401]

# ruff: ignore[F401]
import os

  • Fixes are now shown in check and format --check output:

    ❯ ruff format --check .
unformatted: File would be reformatted
 --> try.md:1:1
  |
1 | ```python
  - import   math
2 + import math
3 | ```
  |

1 file would be reformatted

    This example also shows off the Markdown formatting.

  • format --check now supports the same output formats as the linter, including the github and gitlab outputs for rendering annotations in CI:

    ❯ ruff format --check --output-format github .
::error title=ruff (unformatted),file=try.md,line=2,col=8,endLine=2,endColumn=10::try.md:2:8: unformatted: File would be reformatted

    See the CLI help or documentation for the full list of supported formats.

  • The filename, location, end_location, fix.edits[].location, and fix.edits[].end_location fields in the JSON output format may now be null rather than defaulting to the empty string and row 1, column 1, respectively.

Stabilization

The following rules have been stabilized and are no longer in preview:

The following behaviors have been stabilized:

Preview features

  • [pyupgrade] Fix false positive with TypeVar default before Python 3.13 (UP040) (#26888)

Bug fixes

  • [ruff] Fix missing check on unrecognized early bound (RUF016) (#26986)

Rule changes

  • Insert a space after the colon in Ruff suppression comments (#27123)

Performance

  • [pyupgrade] Speed up unnecessary-future-import (UP010) (#27047)

Documentation

  • [ruff] Add missing period in "Why is this bad?" section (RUF200) (#26930)
  • [flake8-simplify] Clarify os.environ behavior on Windows (SIM112) (#26972)
  • [pydocstyle] Document fix safety (D400) (#26971)

Contributors

0.15.x

See changelogs/0.15.x

0.14.x

See changelogs/0.14.x

0.13.x

See changelogs/0.13.x

0.12.x

See changelogs/0.12.x

0.11.x

See changelogs/0.11.x

0.10.x

See changelogs/0.10.x

0.9.x

See changelogs/0.9.x

0.8.x

See changelogs/0.8.x

0.7.x

See changelogs/0.7.x

0.6.x

See changelogs/0.6.x

0.5.x

See changelogs/0.5.x

0.4.x

See changelogs/0.4.x

0.3.x

See changelogs/0.3.x

0.2.x

See changelogs/0.2.x

0.1.x

See changelogs/0.1.x