# ruff changelog

> ruff release notes.

- Vendor: ruff
- Category: Developer Tools
- Official site: https://docs.astral.sh/ruff
- Tracked by: What's New (https://whatsnew.fyi/product/ruff)
- Harvested from: GitHub (astral-sh/ruff)
- Entries below: 10 (newest first)

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

## Releases

### 0.16.0

- Date: 2026-07-23
- Version: 0.16.0
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.16.0
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.16.0

- **changed** — Ruff now enables a much larger set of rules by default (413, up from 59)
- **removed** — Removed 18 opinionated pycodestyle and pyflakes rules from the default set: E401, E402, E701, E702, E703, E711, E712, E713, E714, E721, E731, E741, E742, E743, F403, F405, F406, and F722
- **added** — Ruff can now format Python code blocks in Markdown files and will do this by default
- **added** — Ruff now supports `ruff: ignore` comments at the ends of lines or on the line preceding a diagnostic to suppress diagnostics
- **changed** — Fixes are now shown in `check` and `format --check` output
- **added** — The `format --check` command now supports the same output formats as the linter, including `github` and `gitlab` outputs for rendering annotations in CI
- **changed** — The `filename`, `location`, `end_location`, `fix.edits[].location`, and `fix.edits[].end_location` fields in JSON output format may now be `null` rather than defaulting to empty string and row 1, column 1
- **changed** — Stabilized `airflow3-incompatible-function-signature` (AIR303) rule
- **changed** — Stabilized `missing-copyright-notice` (CPY001) rule
- **changed** — Stabilized `unnecessary-from-float` (FURB164) rule
- **changed** — Stabilized `sorted-min-max` (FURB192) rule
- **changed** — Stabilized `implicit-string-concatenation-in-collection-literal` (ISC004) rule
- **changed** — Stabilized `log-exception-outside-except-handler` (LOG004) rule
- **changed** — Stabilized `invalid-bool-return-type` (PLE0304) rule
- **changed** — Stabilized `too-many-positional-arguments` (PLR0917) rule
- **changed** — Stabilized `stop-iteration-return` (PLR1708) rule
- **changed** — Stabilized `none-not-at-end-of-union` (RUF036) rule
- **changed** — Stabilized `access-annotations-from-class-dict` (RUF063) rule
- **changed** — Stabilized `duplicate-entry-in-dunder-all` (RUF068) rule
- **changed** — The `blind-except` (BLE001) rule is now suppressed when the exception is logged via `logging` methods other than `critical`, `error`, and `exception`
- **changed** — The `future-required-type-annotation` (FA102) rule now checks for additional PEP 585-compatible APIs such as those from `collections.abc`
- **changed** — The `suspicious-url-open-usage` (S310) rule now resolves local string literal bindings to avoid more false positives
- **changed** — The `snmp-insecure-version` (S508) and `snmp-weak-cryptography` (S509) rules now support the recommended API from newer versions of PySNMP
- **changed** — The `typing-text-str-alias` (UP019) rule now recognizes `typing_extensions.Text` in addition to `typing.Text`
- **fixed** — Fix missing check on unrecognized early bound (RUF016)
- **changed** — Insert a space after the colon in Ruff suppression comments

##### Release Notes

Released on 2026-07-23.

Check out the [blog post](https://astral.sh/blog/ruff-v0.16.0) 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](https://docs.astral.sh/ruff/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](https://docs.astral.sh/ruff/formatter/#markdown-code-formatting) 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`](https://docs.astral.sh/ruff/rules/unused-import/) (`F401`) diagnostic:

    ```py
    import math  # ruff: ignore[F401]

    # ruff: ignore[F401]
    import os
    ```

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

    ````console
    ❯ 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:

    ```console
    ❯ 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](https://docs.astral.sh/ruff/settings/#output-format) 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`](https://docs.astral.sh/ruff/rules/airflow3-incompatible-function-signature) (`AIR303`)
- [`missing-copyright-notice`](https://docs.astral.sh/ruff/rules/missing-copyright-notice) (`CPY001`)
- [`unnecessary-from-float`](https://docs.astral.sh/ruff/rules/unnecessary-from-float) (`FURB164`)
- [`sorted-min-max`](https://docs.astral.sh/ruff/rules/sorted-min-max) (`FURB192`)
- [`implicit-string-concatenation-in-collection-literal`](https://docs.astral.sh/ruff/rules/implicit-string-concatenation-in-collection-literal) (`ISC004`)
- [`log-exception-outside-except-handler`](https://docs.astral.sh/ruff/rules/log-exception-outside-except-handler) (`LOG004`)
- [`invalid-bool-return-type`](https://docs.astral.sh/ruff/rules/invalid-bool-return-type) (`PLE0304`)
- [`too-many-positional-arguments`](https://docs.astral.sh/ruff/rules/too-many-positional-arguments) (`PLR0917`)
- [`stop-iteration-return`](https://docs.astral.sh/ruff/rules/stop-iteration-return) (`PLR1708`)
- [`none-not-at-end-of-union`](https://docs.astral.sh/ruff/rules/none-not-at-end-of-union) (`RUF036`)
- [`access-annotations-from-class-dict`](https://docs.astral.sh/ruff/rules/access-annotations-from-class-dict) (`RUF063`)
- [`duplicate-entry-in-dunder-all`](https://docs.astral.sh/ruff/rules/duplicate-entry-in-dunder-all) (`RUF068`)

The following behaviors have been stabilized:

- [`blind-except`](https://docs.astral.sh/ruff/rules/blind-except) (`BLE001`) is now supp

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.16.0]_

### 0.15.22

- Date: 2026-07-16
- Version: 0.15.22
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.22
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.22

- **added** — Add an autofix for E402 in pycodestyle
- **added** — Allow subclassing builtins in stub files for FURB189 in refurb
- **added** — Add rule to replace noqa comments with ruff:ignore (RUF105)
- **added** — Add rule to use human-readable names in ruff:ignore comments (RUF106)
- **added** — Add rule to use human-readable names in configuration selectors (RUF201)
- **fixed** — Fix false positive in __all__ for PYI053 in flake8-pyi
- **changed** — Ignore mutable type updates in redefined-loop-name (PLW2901) in pylint
- **changed** — Avoid redundant lexer token bookkeeping
- **changed** — Avoid redundant pending-indentation writes
- **changed** — Avoid unnecessary identifier lookahead
- **changed** — Reuse parser scratch buffers

##### Release Notes

Released on 2026-07-16.

###### Preview features

- \[`pycodestyle`\] Add an autofix for `E402` ([#22212](https://github.com/astral-sh/ruff/pull/22212))
- \[`refurb`\] Allow subclassing builtins in stub files (`FURB189`) ([#26812](https://github.com/astral-sh/ruff/pull/26812))
- \[`ruff`\] Add rule to replace `noqa` comments with `ruff:ignore` (`RUF105`) ([#26423](https://github.com/astral-sh/ruff/pull/26423))
- \[`ruff`\] Add rule to use human-readable names in `ruff:ignore` comments (`RUF106`) ([#26682](https://github.com/astral-sh/ruff/pull/26682))
- \[`ruff`\] Add rule to use human-readable names in configuration selectors (`RUF201`) ([#26772](https://github.com/astral-sh/ruff/pull/26772))

###### Bug fixes

- \[`flake8-pyi`\] Fix false positive in `__all__` (`PYI053`) ([#26872](https://github.com/astral-sh/ruff/pull/26872))

###### Rule changes

- \[`pylint`\] Ignore mutable type updates in `redefined-loop-name` (`PLW2901`) ([#25733](https://github.com/astral-sh/ruff/pull/25733))

###### Performance

- Avoid redundant lexer token bookkeeping ([#26765](https://github.com/astral-sh/ruff/pull/26765))
- Avoid redundant pending-indentation writes ([#26774](https://github.com/astral-sh/ruff/pull/26774))
- Avoid unnecessary identifier lookahead ([#26525](https://github.com/astral-sh/ruff/pull/26525))
- Reuse parser scratch buffers ([#26798](https://github.com/astral-sh/ruff/pull/26798))

###### Documentation

- Document argfile support ([#26803](https://github.com/astral-sh/ruff/pull/26803))
- \[`flake8-datetimez`\] Clarify naming guidance for `datetime.today` (`DTZ002`) ([#26658](https://github.com/astral-sh/ruff/pull/26658))
- \[`pycodestyle`\] Document `E731` fix safety ([#26847](https://github.com/astral-sh/ruff/pull/26847))
- \[`ruff`\] Clarify intentional async contexts for `unused-async` (`RUF029`) ([#26641](https://github.com/astral-sh/ruff/pull/26641))

###### Contributors

- [@dwego](https://github.com/dwego)
- [@MichaReiser](https://github.com/MichaReiser)
- [@Joosboy](https://github.com/Joosboy)
- [@KaufmanDmitriy](https://github.com/KaufmanDmitriy)
- [@PeterJCLaw](https://github.com/PeterJCLaw)
- [@ntBre](https://github.com/ntBre)
- [@charliermarsh](https://github.com/charliermarsh)

##### Install ruff 0.15.22

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.22

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-i686-pc-windows-msvc.zip.sha256) |
| [ruff-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-x86_64-pc-windows-msvc.zip) | x64 Windows | [

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.22]_

### 0.15.21

- Date: 2026-07-09
- Version: 0.15.21
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.21
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.21

- **added** — Add `--add-ignore` for adding `ruff:ignore` comments
- **added** — Lint and fix use of deprecated `abc` decorators (`UP051`)
- **changed** — Drop `C409` tuple comprehension preview behavior
- **changed** — Avoid whitespace normalization when formatting comments
- **changed** — Mark `EXE004` fix as unsafe
- **changed** — Mark `PYI061` fixes as unsafe in Python files
- **changed** — Skip `overload-with-docstring` in stub files (`D418`)
- **changed** — Add `--extend-exclude` to `ruff format`
- **fixed** — Refine non-empty f-string detection
- **fixed** — Detect syntax errors in individual notebook cells
- **fixed** — Fix `ISC003` autofix incorrectly stripping `+` from comments

##### Release Notes

Released on 2026-07-09.

###### Preview features

- Add `--add-ignore` for adding `ruff:ignore` comments ([#26346](https://github.com/astral-sh/ruff/pull/26346))
- \[`flake8-comprehensions`\] Drop `C409` tuple comprehension preview behavior ([#25707](https://github.com/astral-sh/ruff/pull/25707))
- Avoid whitespace normalization when formatting comments ([#26455](https://github.com/astral-sh/ruff/pull/26455))
- \[`pyupgrade`\] Lint and fix use of deprecated `abc` decorators (`UP051`) ([#26417](https://github.com/astral-sh/ruff/pull/26417))

###### Bug fixes

- Refine non-empty f-string detection ([#26526](https://github.com/astral-sh/ruff/pull/26526))
- Detect syntax errors in individual notebook cells ([#26419](https://github.com/astral-sh/ruff/pull/26419))
- \[`flake8-implicit-str-concat`\] Fix `ISC003` autofix incorrectly stripping `+` from comments ([#26554](https://github.com/astral-sh/ruff/pull/26554))

###### Rule changes

- \[`flake8-executable`\] Mark `EXE004` fix as unsafe ([#26033](https://github.com/astral-sh/ruff/pull/26033))
- \[`flake8-pyi`\] Mark `PYI061` fixes as unsafe in Python files ([#26533](https://github.com/astral-sh/ruff/pull/26533))
- \[`pydocstyle`\] Skip `overload-with-docstring` in stub files (`D418`) ([#26318](https://github.com/astral-sh/ruff/pull/26318))

###### Performance

- Avoid per-token source index visitor calls ([#26506](https://github.com/astral-sh/ruff/pull/26506))
- Cache parenthesized expression boundaries in the formatter ([#26344](https://github.com/astral-sh/ruff/pull/26344))
- Improve performance of rendering edits in preview mode ([#26565](https://github.com/astral-sh/ruff/pull/26565))
- Inline `fits_element` in formatter ([#26429](https://github.com/astral-sh/ruff/pull/26429))
- Inline formatter printing hot paths ([#26504](https://github.com/astral-sh/ruff/pull/26504))
- Lazily create builtin bindings ([#26510](https://github.com/astral-sh/ruff/pull/26510))
- Skip empty trivia scans in the source indexer ([#26507](https://github.com/astral-sh/ruff/pull/26507))
- Use ICF for macOS release builds ([#25780](https://github.com/astral-sh/ruff/pull/25780))

###### Formatter

- Add `--extend-exclude` to `ruff format` ([#26372](https://github.com/astral-sh/ruff/pull/26372))

###### Documentation

- Add "How does Ruff's import sorting compare to isort?" link to README ([#26530](https://github.com/astral-sh/ruff/pull/26530))
- Fix Mozilla Firefox repository link in README ([#26537](https://github.com/astral-sh/ruff/pull/26537))
- \[`flake8-bandit`\] Fix misleading docstring for `mako-templates` (`S702`) ([#26432](https://github.com/astral-sh/ruff/pull/26432))
- \[`ruff`\] Fix non-triggering example for `if-key-in-dict-del` (`RUF051`) ([#26433](https://github.com/astral-sh/ruff/pull/26433))

###### Contributors

- [@EkriirkE](https://github.com/EkriirkE)
- [@tingerrr](https://github.com/tingerrr)
- [@s-rigaud](https://github.com/s-rigaud)
- [@nikolauspschuetz](https://github.com/nikolauspschuetz)
- [@Avasam](https://github.com/Avasam)
- [@ntBre](https://github.com/ntBre)
- [@omar-y-abdi](https://github.com/omar-y-abdi)
- [@AlexWaygood](https://github.com/AlexWaygood)
- [@sylvestre](https://github.com/sylvestre)
- [@shaanmajid](https://github.com/shaanmajid)
- [@lerebear](https://github.com/lerebear)
- [@baltasarblanco](https://github.com/baltasarblanco)
- [@Sanjays2402](https://github.com/Sanjays2402)
- [@ZedThree](https://github.com/ZedThree)
- [@servusdei2018](https://github.com/servusdei2018)
- [@charliermarsh](https://github.com/charliermarsh)
- [@jesco-absolute](https://github.com/jesco-absolut)
- [@velikodniy](https://github.com/velikodniy)
- [@zaniebot](https://github.com/zaniebot)
- [@epage](https://github.com/epage)

##### Install ruff 0.15.21

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.21/ruff-installer.sh | sh
```

###### Install prebuilt binar

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.21]_

### 0.15.20

- Date: 2026-06-25
- Version: 0.15.20
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.20
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.20

- **added** — Allow human-readable names in rule selectors
- **changed** — Emit a warning instead of an error for unknown rule selectors
- **changed** — Match noqa shebang handling in ruff:ignore comments
- **removed** — Remove pytest-fixture-autouse (RUF076)

##### Release Notes

Released on 2026-06-25.

###### Preview features

- Allow human-readable names in rule selectors ([#25887](https://github.com/astral-sh/ruff/pull/25887))
- Emit a warning instead of an error for unknown rule selectors ([#26113](https://github.com/astral-sh/ruff/pull/26113))
- Match `noqa` shebang handling in `ruff:ignore` comments ([#26286](https://github.com/astral-sh/ruff/pull/26286))
- \[`ruff`\] Remove `pytest-fixture-autouse` (`RUF076`) ([#26240](https://github.com/astral-sh/ruff/pull/26240), [#26371](https://github.com/astral-sh/ruff/pull/26371))

###### Documentation

- Add versioning sections to custom crate READMEs ([#26317](https://github.com/astral-sh/ruff/pull/26317))
- Update `ruff_python_parser` README for crates.io ([#26315](https://github.com/astral-sh/ruff/pull/26315))
- \[`perflint`\] Clarify that `PERF402` applies to any iterable ([#26242](https://github.com/astral-sh/ruff/pull/26242))

###### Contributors

- [@dhruvmanila](https://github.com/dhruvmanila)
- [@MichaReiser](https://github.com/MichaReiser)
- [@ntBre](https://github.com/ntBre)
- [@trilamsr](https://github.com/trilamsr)

##### Install ruff 0.15.20

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.20

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-i686-pc-windows-msvc.zip.sha256) |
| [ruff-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-x86_64-pc-windows-msvc.zip.sha256) |
| [ruff-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-i686-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-powerpc64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.20/ruff-powerpc64le-unknown-linux-gnu

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.20]_

### 0.15.19

- Date: 2026-06-24
- Version: 0.15.19
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.19
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.19

- **added** — Support human-readable names when hovering suppression comments and in code actions
- **fixed** — Fall back to default settings when editor-only settings are invalid
- **fixed** — Fix panic when inserting text at a notebook cell boundary
- **changed** — Update fix suggestions for `__floor__`, `__trunc__`, `__length_hint__`, and `__matmul__` variants (PLC2801)
- **changed** — Avoid allocating when parsing single string literals
- **changed** — Avoid reallocating singleton call arguments
- **changed** — Lazily create source files for lint diagnostics
- **changed** — Optimize formatter text width and indentation
- **changed** — Reserve capacity for builtin bindings
- **changed** — Skip repeated-key checks for singleton dictionaries
- **changed** — Use ArrayVec for qualified name segments

##### Release Notes

Released on 2026-06-23.

###### Preview features

- Support human-readable names when hovering suppression comments and in code actions ([#26114](https://github.com/astral-sh/ruff/pull/26114))

###### Bug fixes

- Fall back to default settings when editor-only settings are invalid ([#26244](https://github.com/astral-sh/ruff/pull/26244))
- Fix panic when inserting text at a notebook cell boundary ([#26111](https://github.com/astral-sh/ruff/pull/26111))

###### Rule changes

- \[`pylint`\] Update fix suggestions for `__floor__`, `__trunc__`, `__length_hint__`, and `__matmul__` variants (`PLC2801`) ([#26239](https://github.com/astral-sh/ruff/pull/26239))

###### Performance

- Avoid allocating when parsing single string literals ([#26200](https://github.com/astral-sh/ruff/pull/26200))
- Avoid reallocating singleton call arguments ([#26223](https://github.com/astral-sh/ruff/pull/26223))
- Lazily create source files for lint diagnostics ([#26226](https://github.com/astral-sh/ruff/pull/26226))
- Optimize formatter text width and indentation ([#26236](https://github.com/astral-sh/ruff/pull/26236))
- Reserve capacity for builtin bindings ([#26229](https://github.com/astral-sh/ruff/pull/26229))
- Skip repeated-key checks for singleton dictionaries ([#26228](https://github.com/astral-sh/ruff/pull/26228))
- Use ArrayVec for qualified name segments ([#26224](https://github.com/astral-sh/ruff/pull/26224))

###### Documentation

- \[`flake8-pyi`\] Note that `PYI051` is an opinionated stylistic rule ([#26179](https://github.com/astral-sh/ruff/pull/26179))
- \[`pyupgrade`\] Clarify `UP029` as a Python 2 compatibility rule ([#26243](https://github.com/astral-sh/ruff/pull/26243))

###### Other changes

- Publish Ruff crates to crates.io ([#26271](https://github.com/astral-sh/ruff/pull/26271))

###### Contributors

- [@MakenRosa](https://github.com/MakenRosa)
- [@MichaReiser](https://github.com/MichaReiser)
- [@trilamsr](https://github.com/trilamsr)
- [@ntBre](https://github.com/ntBre)
- [@sanjibani](https://github.com/sanjibani)
- [@charliermarsh](https://github.com/charliermarsh)

##### Install ruff 0.15.19

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.19

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-i686-pc-windows-msvc.zip.sha256) |
| [ruff-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.19/ruff-x86_64-pc-windows-msvc.zip.sha256) |
| [ruff-aarch64-

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.19]_

### 0.15.18

- Date: 2026-06-18
- Version: 0.15.18
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.18
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.18

- **added** — Handle nested `ruff:ignore` comments
- **changed** — Stop displaying severity in output
- **changed** — Use human-readable names in CLI output
- **changed** — Use human-readable names in LSP and playground diagnostics
- **added** — Prevent property docstrings starting with verbs in pydocstyle (D421)
- **added** — Extend PYI033 to Python files in flake8-pyi
- **fixed** — Detect equivalent numeric mapping keys
- **fixed** — Detect mapping keys equivalent to booleans
- **fixed** — Detect repeated signed and complex dictionary keys
- **changed** — Rename PYI033 to legacy-type-comment in flake8-pyi
- **changed** — Render subdiagnostics and secondary annotations as related information in LSP server
- **fixed** — Reject `__debug__` lambda parameters in parser
- **fixed** — Reject `_` as a match-pattern target in parser
- **fixed** — Reject multiple starred names in sequence patterns in parser
- **fixed** — Reject parenthesized star imports in parser
- **fixed** — Reject starred comprehension targets in parser
- **fixed** — Reject unparenthesized generator expressions in class bases in parser
- **fixed** — Reject `yield` expressions after commas in parser
- **fixed** — Validate function type parameter default order in parser
- **added** — Make diagnostic links clickable in playground

##### Release Notes

Released on 2026-06-18.

###### Preview features

- Handle nested `ruff:ignore` comments ([#25791](https://github.com/astral-sh/ruff/pull/25791))
- Stop displaying severity in output ([#26050](https://github.com/astral-sh/ruff/pull/26050))
- Use human-readable names in CLI output ([#25937](https://github.com/astral-sh/ruff/pull/25937))
- Use human-readable names in LSP and playground diagnostics ([#26058](https://github.com/astral-sh/ruff/pull/26058))
- \[`pydocstyle`\] Prevent property docstrings starting with verbs (`D421`) ([#23775](https://github.com/astral-sh/ruff/pull/23775))
- \[`flake8-pyi`\] Extend `PYI033` to Python files ([#26129](https://github.com/astral-sh/ruff/pull/26129))

###### Bug fixes

- Detect equivalent numeric mapping keys ([#26009](https://github.com/astral-sh/ruff/pull/26009))
- Detect mapping keys equivalent to booleans ([#25982](https://github.com/astral-sh/ruff/pull/25982))
- Detect repeated signed and complex dictionary keys ([#26007](https://github.com/astral-sh/ruff/pull/26007))

###### Rule changes

- \[`flake8-pyi`\] Rename `PYI033` to `legacy-type-comment` ([#26131](https://github.com/astral-sh/ruff/pull/26131))

###### Performance

- Use `ThinVec` for call keywords ([#25999](https://github.com/astral-sh/ruff/pull/25999))
- Inline parser recovery context checks ([#26038](https://github.com/astral-sh/ruff/pull/26038))
- Match parser keywords as bytes ([#26037](https://github.com/astral-sh/ruff/pull/26037))
- Move value parsing out of lexing ([#25360](https://github.com/astral-sh/ruff/pull/25360))

###### Server

- Render subdiagnostics and secondary annotations as related information ([#26011](https://github.com/astral-sh/ruff/pull/26011))

###### Documentation

- Update fix availability for always-fixable rules ([#26091](https://github.com/astral-sh/ruff/pull/26091))
- \[`flake8-tidy-imports`\] Add fix safety section (`TID252`) ([#17491](https://github.com/astral-sh/ruff/pull/17491))

###### Parser

- Reject `__debug__` lambda parameters ([#26022](https://github.com/astral-sh/ruff/pull/26022))
- Reject `_` as a match-pattern target ([#25977](https://github.com/astral-sh/ruff/pull/25977))
- Reject multiple starred names in sequence patterns ([#25976](https://github.com/astral-sh/ruff/pull/25976))
- Reject parenthesized star imports ([#26021](https://github.com/astral-sh/ruff/pull/26021))
- Reject starred comprehension targets ([#26023](https://github.com/astral-sh/ruff/pull/26023))
- Reject unparenthesized generator expressions in class bases ([#25978](https://github.com/astral-sh/ruff/pull/25978))
- Reject `yield` expressions after commas ([#26024](https://github.com/astral-sh/ruff/pull/26024))
- Validate function type parameter default order ([#25981](https://github.com/astral-sh/ruff/pull/25981))

###### Playground

- Make diagnostic links clickable ([#26104](https://github.com/astral-sh/ruff/pull/26104))
- Use diagnostic tags ([#26105](https://github.com/astral-sh/ruff/pull/26105))

###### Contributors

- [@AlexWaygood](https://github.com/AlexWaygood)
- [@ntBre](https://github.com/ntBre)
- [@gtkacz](https://github.com/gtkacz)
- [@MichaReiser](https://github.com/MichaReiser)
- [@charliermarsh](https://github.com/charliermarsh)
- [@Kalmaegi](https://github.com/Kalmaegi)

##### Install ruff 0.15.18

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.18/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.18/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.18

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.18/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/git

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.18]_

### 0.15.17

- Date: 2026-06-11
- Version: 0.15.17
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.17
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.17

- **added** — Allow human-readable names in suppression comments
- **fixed** — Fix handling of `ignore` comments within a `disable`/`enable` pair
- **added** — Prioritize human-readable names in CLI output
- **changed** — Respect diagnostic start and parent ranges and trailing comments in `ruff:ignore` suppressions
- **added** — Add `trio.as_safe_channel` to safe decorators for `flake8-async` (ASYNC119)
- **added** — Check `pytest_asyncio` fixtures in `flake8-pytest-style`
- **added** — Ban `pytest` autouse fixtures with rule RUF076
- **added** — Add `from __future__ import annotations` automatically in `pyupgrade` (UP007, UP045)
- **fixed** — Fix diagnostic when `ruff:enable` or `ruff:disable` appears where `ruff:ignore` is expected
- **fixed** — Preserve leading empty literals to avoid syntax errors in `pyupgrade` (UP032)
- **changed** — Clarify diagnostic message for single parameters in `flake8-pytest-style` (PT007)
- **removed** — Drop autofix for `np.in1d` in `numpy` (NPY201)
- **changed** — Exempt Python version comparisons in `pylint` (PLR2004)
- **changed** — Reserve AST `Vec`s with correct capacity for common cases
- **fixed** — Preserve whitespace for Quarto cell option comments in formatter
- **added** — Allow rule names in `ruff rule` command

##### Release Notes

Released on 2026-06-11.

###### Preview features

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

###### Bug fixes

- Fix diagnostic when `ruff:enable` or `ruff:disable` appears where `ruff:ignore` is expected ([#25700](https://github.com/astral-sh/ruff/pull/25700))
- \[`pyupgrade`\] Preserve leading empty literals to avoid syntax errors (`UP032`) ([#25491](https://github.com/astral-sh/ruff/pull/25491))

###### Rule changes

- \[`flake8-pytest-style`\] Clarify diagnostic message for single parameters (`PT007`) ([#25592](https://github.com/astral-sh/ruff/pull/25592))
- \[`numpy`\] Drop autofix for `np.in1d` (`NPY201`) ([#25612](https://github.com/astral-sh/ruff/pull/25612))
- \[`pylint`\] Exempt Python version comparisons (`PLR2004`) ([#25743](https://github.com/astral-sh/ruff/pull/25743))

###### Performance

- Reserve AST `Vec`s with correct capacity for common cases ([#25451](https://github.com/astral-sh/ruff/pull/25451))

###### Formatter

- Preserve whitespace for Quarto cell option comments ([#25641](https://github.com/astral-sh/ruff/pull/25641))

###### CLI

- Allow rule names in `ruff rule` ([#25640](https://github.com/astral-sh/ruff/pull/25640))

###### Other changes

- Fix playground diagnostics scrollbars ([#25642](https://github.com/astral-sh/ruff/pull/25642))

###### Contributors

- [@SuryanshSS1011](https://github.com/SuryanshSS1011)
- [@anishgirianish](https://github.com/anishgirianish)
- [@romero-deshaw](https://github.com/romero-deshaw)
- [@karlhillx](https://github.com/karlhillx)
- [@carljm](https://github.com/carljm)
- [@ntBre](https://github.com/ntBre)
- [@11happy](https://github.com/11happy)
- [@Kilo59](https://github.com/Kilo59)
- [@oconnor663](https://github.com/oconnor663)
- [@LeonidasZhak](https://github.com/LeonidasZhak)
- [@DavisVaughan](https://github.com/DavisVaughan)
- [@MeGaGiGaGon](https://github.com/MeGaGiGaGon)
- [@jonathandung](https://github.com/jonathandung)
- [@MichaReiser](https://github.com/MichaReiser)
- [@brianmego](https://github.com/brianmego)

##### Install ruff 0.15.17

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.17/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.17/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.17

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.17/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.17/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.17/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.17]_

### 0.15.16

- Date: 2026-06-04
- Version: 0.15.16
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.16
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.16

- **added** — Implement `yield-in-context-manager-in-async-generator` (ASYNC119) for flake8-async
- **changed** — Narrow diagnostic range and exclude cases without exception handlers for PLW0717 in pylint
- **changed** — Treat `yield` before `break` from a terminal loop as terminal (RUF075) in ruff
- **fixed** — Avoid flagging `ruff:ignore` comments as code (ERA001) in eradicate
- **fixed** — Fix ERA001/RUF100 conflict when `noqa` is on commented-out code
- **fixed** — Avoid removing the `format` call when it would change behavior (F523) in pyflakes
- **fixed** — Avoid syntax errors in invalid character replacements in f-strings before Python 3.12 (PLE2510, PLE2512, PLE2513, PLE2514, PLE2515) in pylint
- **fixed** — Avoid converting `format` calls with more kinds of side effects (UP032) in pyupgrade
- **changed** — Avoid fixes for ambiguous `argnames` and `argvalues` combinations (PT006) in flake8-pytest-style
- **changed** — Drop excess capacity from statement suites during parsing

##### Release Notes

Released on 2026-06-04.

###### Preview features

- \[`flake8-async`\] Implement `yield-in-context-manager-in-async-generator` (`ASYNC119`) ([#24644](https://github.com/astral-sh/ruff/pull/24644))
- \[`pylint`\] Narrow diagnostic range and exclude cases without exception handlers (`PLW0717`) ([#25440](https://github.com/astral-sh/ruff/pull/25440))
- \[`ruff`\] Treat `yield` before `break` from a terminal loop as terminal (`RUF075`) ([#25447](https://github.com/astral-sh/ruff/pull/25447))

###### Bug fixes

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

###### Rule changes

- \[`flake8-pytest-style`\] Avoid fixes for ambiguous `argnames` and `argvalues` combinations (`PT006`) ([#24776](https://github.com/astral-sh/ruff/pull/24776))

###### Performance

- Drop excess capacity from statement suites during parsing ([#25368](https://github.com/astral-sh/ruff/pull/25368))

###### Documentation

- \[`pydocstyle`\] Improve discoverability of rules enabled for each convention ([#24973](https://github.com/astral-sh/ruff/pull/24973))
- \[`ruff`\] Restore example code for Python versions before 3.15 (`RUF017`) ([#25439](https://github.com/astral-sh/ruff/pull/25439))
- Fix typo `bin/active` → `bin/activate` in tutorial ([#25473](https://github.com/astral-sh/ruff/pull/25473))

###### Other changes

- Shrink additional parser AST collections ([#25465](https://github.com/astral-sh/ruff/pull/25465))

###### Contributors

- [@Redslayer112](https://github.com/Redslayer112)
- [@koriyoshi2041](https://github.com/koriyoshi2041)
- [@George-Ogden](https://github.com/George-Ogden)
- [@TejasAmle](https://github.com/TejasAmle)
- [@anishgirianish](https://github.com/anishgirianish)
- [@ntBre](https://github.com/ntBre)
- [@MichaReiser](https://github.com/MichaReiser)
- [@loganrosen](https://github.com/loganrosen)
- [@RafaelJohn9](https://github.com/RafaelJohn9)
- [@adityasingh2400](https://github.com/adityasingh2400)

##### Install ruff 0.15.16

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.16

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.16/ruff-aarch64-pc-windows-msvc.

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.16]_

### 0.15.15

- Date: 2026-05-28
- Version: 0.15.15
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.15
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.15

- **fixed** — Fix Markdown closing fence handling
- **added** — Report duplicate imports in typing.TYPE_CHECKING block (F811)
- **fixed** — Treat function-scope bare annotations as locals per PEP 526 (F821)
- **changed** — Avoid redundant TokenValue drops in the lexer
- **changed** — Reduce memory usage by dropping token-excess capacity and improve performance by approximating the initial tokens Vec size
- **changed** — Use ThinVec in AST to shrink Stmt
- **fixed** — Fix formatting of lambdas nested within f-strings
- **fixed** — Return code action for codeAction/resolve requests that contain no or no valid URL
- **changed** — Expand semantic syntax errors for invalid walruses

##### Release Notes

Released on 2026-05-28.

###### Preview features

- Fix Markdown closing fence handling ([#25310](https://github.com/astral-sh/ruff/pull/25310))
- \[`pyflakes`\] Report duplicate imports in `typing.TYPE_CHECKING` block (`F811`) ([#22560](https://github.com/astral-sh/ruff/pull/22560))

###### Bug fixes

- \[`pyflakes`\] Treat function-scope bare annotations as locals per PEP 526 (`F821`) ([#21540](https://github.com/astral-sh/ruff/pull/21540))

###### Performance

- Avoid redundant `TokenValue` drops in the lexer ([#25300](https://github.com/astral-sh/ruff/pull/25300))
- Reduce memory usage by dropping token-excess capacity and improve performance by approximating the initial tokens `Vec` size ([#25354](https://github.com/astral-sh/ruff/pull/25354))
- Use `ThinVec` in AST to shrink `Stmt` ([#25361](https://github.com/astral-sh/ruff/pull/25361))

###### Documentation

- Fix `line-length` example for `--config` option ([#25389](https://github.com/astral-sh/ruff/pull/25389))
- \[`flake8-comprehensions`\] Document `RecursionError` edge case in `__len__` (`C416`) ([#25286](https://github.com/astral-sh/ruff/pull/25286))
- \[`mccabe`\] Improve example (`C901`) ([#25287](https://github.com/astral-sh/ruff/pull/25287))
- \[`pyupgrade`\] Clarify fix safety docs (`UP007`, `UP045`) ([#25288](https://github.com/astral-sh/ruff/pull/25288))
- \[`refurb`\] Document `FURB192` exception change for empty sequences ([#25317](https://github.com/astral-sh/ruff/pull/25317))
- \[`ruff`\] Document false negative for user-defined types (`RUF013`) ([#25289](https://github.com/astral-sh/ruff/pull/25289))

###### Formatter

- Fix formatting of lambdas nested within f-strings ([#25398](https://github.com/astral-sh/ruff/pull/25398))

###### Server

- Return code action for `codeAction/resolve` requests that contain no or no valid URL ([#25365](https://github.com/astral-sh/ruff/pull/25365))

###### Other changes

- Expand semantic syntax errors for invalid walruses ([#25415](https://github.com/astral-sh/ruff/pull/25415))

###### Contributors

- [@chirizxc](https://github.com/chirizxc)
- [@ntBre](https://github.com/ntBre)
- [@adityasingh2400](https://github.com/adityasingh2400)
- [@charliermarsh](https://github.com/charliermarsh)
- [@fallintoplace](https://github.com/fallintoplace)
- [@martin-schlossarek](https://github.com/martin-schlossarek)
- [@MichaReiser](https://github.com/MichaReiser)
- [@Ruchir28](https://github.com/Ruchir28)

##### Install ruff 0.15.15

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.15

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.15.15/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/release

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.15]_

### 0.15.14

- Date: 2026-05-21
- Version: 0.15.14
- Original notes: https://github.com/astral-sh/ruff/releases/tag/0.15.14
- Permalink: https://whatsnew.fyi/product/ruff/releases/0.15.14

- **added** — Implement airflow-task-implicit-multiple-outputs (AIR202) rule
- **added** — Implement too-many-try-statements (W0717) rule for pylint
- **added** — Add incorrect-decorator-order (RUF074) rule
- **added** — Add fallible-context-manager (RUF075) rule
- **changed** — Mark PTH101 fix as unsafe when first argument is a class attribute annotated as int
- **changed** — Skip C417 for lambdas with positional-only parameters
- **changed** — Preserve f-string source verbatim in SIM101 fix
- **changed** — Treat generic frozenset annotations as immutable
- **changed** — Add full PEP 798 support
- **changed** — Add a parser recursion limit
- **fixed** — Fix lambda formatting in interpolated string expressions
- **fixed** — Avoid strict behavior in flake8-type-checking when future-annotations are enabled (TC001, TC002, TC003)
- **fixed** — Avoid false positives in else clause for pylint (PLR1733)
- **changed** — Avoid unnecessary parser lookahead for operators

##### Release Notes

Released on 2026-05-21.

###### Preview features

- \[`airflow`\] Implement `airflow-task-implicit-multiple-outputs` (`AIR202`) ([#25152](https://github.com/astral-sh/ruff/pull/25152))
- \[`flake8-use-pathlib`\] Mark `PTH101` fix as unsafe when first argument is a class attribute annotated as `int` ([#25086](https://github.com/astral-sh/ruff/pull/25086))
- \[`pylint`\] Implement `too-many-try-statements` (`W0717`) ([#23970](https://github.com/astral-sh/ruff/pull/23970))
- \[`ruff`\] Add `incorrect-decorator-order` (`RUF074`) ([#23461](https://github.com/astral-sh/ruff/pull/23461))
- \[`ruff`\] Add `fallible-context-manager` (`RUF075`) ([#22844](https://github.com/astral-sh/ruff/pull/22844))

###### Bug fixes

- Fix lambda formatting in interpolated string expressions ([#25144](https://github.com/astral-sh/ruff/pull/25144))
- Treat generic `frozenset` annotations as immutable ([#25251](https://github.com/astral-sh/ruff/pull/25251))
- \[`flake8-type-checking`\] Avoid `strict` behavior when `future-annotations` are enabled (`TC001`, `TC002`, `TC003`) ([#25035](https://github.com/astral-sh/ruff/pull/25035))
- \[`pylint`\] Avoid false positives in `else` clause (`PLR1733`) ([#25177](https://github.com/astral-sh/ruff/pull/25177))

###### Rule changes

- \[`flake8-comprehensions`\] Skip `C417` for lambdas with positional-only parameters ([#25272](https://github.com/astral-sh/ruff/pull/25272))
- \[`flake8-simplify`\] Preserve f-string source verbatim in `SIM101` fix ([#25061](https://github.com/astral-sh/ruff/pull/25061))

###### Performance

- Avoid unnecessary parser lookahead for operators ([#25290](https://github.com/astral-sh/ruff/pull/25290))

###### Documentation

- Update code example setting Neovim LSP log level ([#25284](https://github.com/astral-sh/ruff/pull/25284))

###### Other changes

- Add full PEP 798 support ([#25104](https://github.com/astral-sh/ruff/pull/25104))
- Add a parser recursion limit ([#24810](https://github.com/astral-sh/ruff/pull/24810))
- Update various `ruff_python_stdlib` APIs ([#25273](https://github.com/astral-sh/ruff/pull/25273))

###### Contributors

- [@ocaballeror](https://github.com/ocaballeror)
- [@lerebear](https://github.com/lerebear)
- [@samuelcolvin](https://github.com/samuelcolvin)
- [@baltasarblanco](https://github.com/baltasarblanco)
- [@aconal-com](https://github.com/aconal-com)
- [@anishgirianish](https://github.com/anishgirianish)
- [@JelleZijlstra](https://github.com/JelleZijlstra)
- [@AlexWaygood](https://github.com/AlexWaygood)
- [@ntBre](https://github.com/ntBre)
- [@adityasingh2400](https://github.com/adityasingh2400)
- [@charliermarsh](https://github.com/charliermarsh)
- [@Dev-iL](https://github.com/Dev-iL)
- [@neutrinoceros](https://github.com/neutrinoceros)
- [@shivamtiwari3](https://github.com/shivamtiwari3)
- [@Dev-X25874](https://github.com/Dev-X25874)

##### Install ruff 0.15.14

###### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-installer.sh | sh
```

###### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-installer.ps1 | iex"
```

##### Download ruff 0.15.14

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.15.14/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.

_[Truncated at 4000 characters — full notes: https://github.com/astral-sh/ruff/releases/tag/0.15.14]_