0.16.6

astral-sh/ruff0.16.6Sep 3, 2026by github-actions[bot]
AI Summary

This release focuses on preview features for linting rules, various bug fixes including parsing and datetime validation, and documentation updates. It also adds support for unary plus in match patterns on Python 3.15.
Key Highlights

Preview features for `pytest-fixture-autouse`, `flake8-tidy-imports`, and `isort`.
Bug fixes for parsing unary expressions, recognizing `builtins.open`, and fixing panics on match subjects.
Support for unary plus in match patterns on Python 3.15.
Documentation updates for various linting rules like `flake8-async` and `pyupgrade`.
New Features

Preview autofix for `PT020` in `flake8-pytest-style`.
Validation for unary expressions during parsing.
Fix for panic on `match` subjects in `flake8-bugbear`.
Exclusion of pragma comments from line length calculation in `isort`.
Full Release Notes

## Release Notes

Released on 2026-09-03.

### Preview features

- Move `pytest-fixture-autouse` to the `restriction` category ([#28219](https://github.com/astral-sh/ruff/pull/28219))
- \[`flake8-pytest-style`\] Add an autofix for `PT020` ([#27993](https://github.com/astral-sh/ruff/pull/27993))
- \[`flake8-tidy-imports`\] Prevent fix loop between `TID254` and `TID255` ([#28262](https://github.com/astral-sh/ruff/pull/28262))
- \[`isort`\] Exclude pragma comments from line length calculation (`I001`) ([#27313](https://github.com/astral-sh/ruff/pull/27313))

### Bug fixes

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

### Rule changes

- \[`flake8-use-pathlib`\] Add display-only fix for `os.listdir` (`PTH208`) ([#28027](https://github.com/astral-sh/ruff/pull/28027))

### Documentation

- Add another example and glob reference for `lint.per-file-ignores` ([#28106](https://github.com/astral-sh/ruff/pull/28106))
- Add duplicate work guidance ([#28229](https://github.com/astral-sh/ruff/pull/28229))
- \[`flake8-async`\] Document thread offloading (`ASYNC240`) ([#28008](https://github.com/astral-sh/ruff/pull/28008))
- \[`pyupgrade`\] Clarify default `encoding` argument handling (`UP012`) ([#27315](https://github.com/astral-sh/ruff/pull/27315))

### Other changes

- Allow unary plus in match patterns on Python 3.15 ([#28231](https://github.com/astral-sh/ruff/pull/28231))

### Contributors

- [@flying-sheep](https://github.com/flying-sheep)
- [@pikammmmm](https://github.com/pikammmmm)
- [@fly1d](https://github.com/fly1d)
- [@waterWang](https://github.com/waterWang)
- [@Pierre-Sassoulas](https://github.com/Pierre-Sassoulas)
- [@ntBre](https://github.com/ntBre)
- [@jelle-openai](https://github.com/jelle-openai)
- [@ericbuehl](https://github.com/ericbuehl)
- [@tjkuson](https://github.com/tjkuson)
- [@AbhinavMir](https://github.com/AbhinavMir)
- [@Whning0513](https://github.com/Whning0513)
- [@chirizxc](https://github.com/chirizxc)

## Install ruff 0.16.6

### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-installer.sh | sh
```

### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-installer.ps1 | iex"
```

## Download ruff 0.16.6

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-pc-windows-msvc.zip.sha256) |
| [ruff-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-pc-windows-msvc.zip.sha256) |
| [ruff-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-powerpc64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-powerpc64le-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-riscv64gc-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-riscv64gc-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-s390x-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-s390x-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-x86_64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-armv7-unknown-linux-gnueabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-armv7-unknown-linux-gnueabihf.tar.gz.sha256) |
| [ruff-aarch64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-aarch64-unknown-linux-musl.tar.gz.sha256) |
| [ruff-i686-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-i686-unknown-linux-musl.tar.gz.sha256) |
| [ruff-x86_64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-x86_64-unknown-linux-musl.tar.gz.sha256) |
| [ruff-arm-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-arm-unknown-linux-musleabihf.tar.gz.sha256) |
| [ruff-armv7-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.6/ruff-armv7-unknown-linux-musleabihf.tar.gz.sha256) |

## Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the [GitHub CLI](https://cli.github.com/manual/gh_attestation_verify):
```sh
gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ruff
```

You can also download the attestation from [GitHub](https://github.com/astral-sh/ruff/attestations) and verify against that directly:
```sh
gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>
```