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!
[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

0.15.1

Released on 2026-02-12.

Preview features

[airflow] Add ruff rules to catch deprecated Airflow imports for Airflow 3.1 (AIR321) (#22376)
[airflow] Third positional parameter not named ti_key should be flagged for BaseOperatorLink.get_link (AIR303) (#22828)
[flake8-gettext] Fix false negatives for plural argument of ngettext (INT001, INT002, INT003) (#21078)
[pyflakes] Fix infinite loop in preview fix for unused-import (F401) (#23038)
[pygrep-hooks] Detect non-existent mock methods in standalone expressions (PGH005) (#22830)
[pylint] Allow dunder submodules and improve diagnostic range (PLC2701) (#22804)
[pyupgrade] Improve diagnostic range for tuples (UP024) (#23013)
[refurb] Check subscripts in tuple do not use lambda parameters in reimplemented-operator (FURB118) (#23079)
[ruff] Detect mutable defaults in field calls (RUF008) (#23046)
[ruff] Ignore std cmath.inf (RUF069) (#23120)
[ruff] New rule float-equality-comparison (RUF069) (#20585)
Don't format unlabeled Markdown code blocks (#23106)
Markdown formatting support in LSP (#23063)
Support Quarto Markdown language markers (#22947)
Support formatting pycon Markdown code blocks (#23112)
Use extension mapping to select Markdown code block language (#22934)

Bug fixes

Avoid false positive for undefined variables in FAST001 (#23224)
Avoid introducing syntax errors for FAST003 autofix (#23227)
Avoid suggesting InitVar for __post_init__ that references PEP 695 type parameters (#23226)
Deduplicate type variables in generic functions (#23225)
Fix exception handler parenthesis removal for Python 3.14+ (#23126)
Fix f-string middle panic when parsing t-strings (#23232)
Wrap RUF020 target for multiline fixes (#23210)
Wrap UP007 target for multiline fixes (#23208)
Fix missing diagnostics for last range suppression in file (#23242)
[pyupgrade] Fix syntax error on string with newline escape and comment (UP037) (#22968)

Rule changes

Use ruff instead of Ruff as the program name in GitHub output format (#23240)
[PT006] Fix syntax error when unpacking nested tuples in parametrize fixes (#22441) (#22464)
[airflow] Catch deprecated attribute access from context key for Airflow 3.0 (AIR301) (#22850)
[airflow] Capture deprecated arguments and a decorator (AIR301) (#23170)
[flake8-boolean-trap] Add multiprocessing.Value to excluded functions for FBT003 (#23010)
[flake8-bugbear] Add a secondary annotation showing the previous occurrence (B033) (#22634)
[flake8-type-checking] Add sub-diagnostic showing the runtime use of an annotation (TC004) (#23091)
[isort] Support configurable import section heading comments (#23151)
[ruff] Improve the diagnostic for RUF012 (#23202)

Formatter

Suppress diagnostic output for format --check --silent (#17736)

Documentation

Add tabbed shell completion documentation (#23169)
Explain how to enable Markdown formatting for pre-commit hook (#23077)
Fixed import in runtime-evaluated-decorators example (#23187)
Update ruff server contributing guide (#23060)

Other changes

Exclude WASM artifacts from GitHub releases (#23221)

Contributors

0.15.0

Released on 2026-02-03.

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

Breaking changes

Ruff now formats your code according to the 2026 style guide. See the formatter section below or in the blog post for a detailed list of changes.
The linter now supports block suppression comments. For example, to suppress N803 for all parameters in this function:
```
# ruff: disable[N803]
def foo(
    legacyArg1,
    legacyArg2,
    legacyArg3,
    legacyArg4,
): ...
# ruff: enable[N803]
```
See the documentation for more details.
The ruff:alpine Docker image is now based on Alpine 3.23 (up from 3.21).
The ruff:debian and ruff:debian-slim Docker images are now based on Debian 13 “Trixie” instead of Debian 12 “Bookworm.”
Binaries for the ppc64 (64-bit big-endian PowerPC) architecture are no longer included in our releases. It should still be possible to build Ruff manually for this platform, if needed.
Ruff now resolves all extended configuration files before falling back on a default Python version.

Stabilization

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

blocking-http-call-httpx-in-async-function (ASYNC212)
blocking-path-method-in-async-function (ASYNC240)
blocking-input-in-async-function (ASYNC250)
map-without-explicit-strict (B912)
if-exp-instead-of-or-operator (FURB110)
single-item-membership-test (FURB171)
missing-maxsplit-arg (PLC0207)
unnecessary-lambda (PLW0108)
unnecessary-empty-iterable-within-deque-call (RUF037)
in-empty-collection (RUF060)
legacy-form-pytest-raises (RUF061)
non-octal-permissions (RUF064)
invalid-rule-code (RUF102)
invalid-suppression-comment (RUF103)
unmatched-suppression-comment (RUF104)
replace-str-enum (UP042)

The following behaviors have been stabilized:

The --output-format flag is now respected when running Ruff in --watch mode, and the full output format is now used by default, matching the regular CLI output.
builtin-attribute-shadowing (A003) now detects the use of shadowed built-in names in additional contexts like decorators, default arguments, and other attribute definitions.
duplicate-union-member (PYI016) now considers typing.Optional when searching for duplicate union members.
split-static-string (SIM905) now offers an autofix when the maxsplit argument is provided, even without a sep argument.
dict-get-with-none-default (SIM910) now applies to more types of key expressions.
super-call-with-parameters (UP008) now has a safe fix when it will not delete comments.
unnecessary-default-type-args (UP043) now applies to stub (.pyi) files on Python versions before 3.13.

Formatter

This release introduces the new 2026 style guide, with the following changes:

Lambda parameters are now kept on the same line and lambda bodies will be parenthesized to let them break across multiple lines (#21385)
Parentheses around tuples of exceptions in except clauses will now be removed on Python 3.14 and later (#20768)
A single empty line is now permitted at the beginning of function bodies (#21110)
Parentheses are avoided for long as captures in match statements (#21176)
Extra spaces between escaped quotes and ending triple quotes can now be omitted (#17216)
Blank lines are now enforced before classes with decorators in stub files (#18888)

Preview features

Apply formatting to Markdown code blocks (#22470, #22990, #22996)
See the documentation for more details.

Bug fixes

Fix suppression indentation matching (#22903)

Rule changes

Customize where the fix_title sub-diagnostic appears (#23044)
[FastAPI] Add sub-diagnostic explaining why a fix was unavailable (FAST002) (#22565)
[flake8-annotations] Don't suggest NoReturn for functions raising NotImplementedError (ANN201, ANN202, ANN205, ANN206) (#21311)
[pyupgrade] Make fix unsafe if it deletes comments (UP017) (#22873)
[pyupgrade] Make fix unsafe if it deletes comments (UP020) (#22872)
[pyupgrade] Make fix unsafe if it deletes comments (UP033) (#22871)
[refurb] Do not add abc.ABC if already present (FURB180) (#22234)
[refurb] Make fix unsafe if it deletes comments (FURB110) (#22768)
[ruff] Add sub-diagnostics with permissions (RUF064) (#22972)