Changelog

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:

airflow3-incompatible-function-signature (AIR303)
missing-copyright-notice (CPY001)
unnecessary-from-float (FURB164)
sorted-min-max (FURB192)
implicit-string-concatenation-in-collection-literal (ISC004)
log-exception-outside-except-handler (LOG004)
invalid-bool-return-type (PLE0304)
too-many-positional-arguments (PLR0917)
stop-iteration-return (PLR1708)
none-not-at-end-of-union (RUF036)
access-annotations-from-class-dict (RUF063)
duplicate-entry-in-dunder-all (RUF068)

The following behaviors have been stabilized:

blind-except (BLE001) is now suppressed when the exception is logged via logging methods other than critical, error and exception.
future-required-type-annotation (FA102) now checks for additional PEP 585-compatible APIs, such as those from collections.abc.
f-string-in-get-text-func-call (INT001), format-in-get-text-func-call (INT002), and printf-in-get-text-func-call (INT003) now check for additional common ways of using the gettext module, such as assigning it to builtins._.
suspicious-url-open-usage (S310) now resolves local string literal bindings to avoid more false positives.
snmp-insecure-version (S508) and snmp-weak-cryptography (S509) now support the recommended API from newer versions of PySNMP.
typing-text-str-alias (UP019) now recognizes typing_extensions.Text in addition to typing.Text.

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)