0.16.3

affaan-m/ECC0.16.3Aug 13, 2026by github-actions[bot]
AI Summary

Released on 2026-08-13, this release focuses on performance optimizations through Profile-Guided Optimization (PGO) and adds a new rule to modernize `while 1` loops.
Key Highlights

Enable PGO for multiple platforms (Linux, Windows, macOS)
Add rule to replace `while 1` with `while True`
Fix false positives on negative numbers in Pylint
Hyperlink rule codes in `ruff check --statistics` output
Reduce `Expr` size to 64 bytes
New Features

`while 1` -> `while True` rule
PGO enabled for releases
Full Release Notes

## Release Notes

Released on 2026-08-13.

### Preview features

- \[`pylint`\] Fix false negatives on negative numbers (`PLR6104`) ([#27251](https://github.com/astral-sh/ruff/pull/27251))
- \[`pyupgrade`\] Add rule to replace `while 1` with `while True` (`UP048`) ([#27190](https://github.com/astral-sh/ruff/pull/27190))

### Bug fixes

- \[`flake8-bandit`\] Also check keyword arguments (`S602`, `S603`, `S607`, `S609`) ([#27687](https://github.com/astral-sh/ruff/pull/27687))
- \[`pylint`\] Allow `continue` in `finally` on Python 3.8 ([#27626](https://github.com/astral-sh/ruff/pull/27626))
- \[`pylint`\] Fix `PLE1307` false positive with bools ([#27651](https://github.com/astral-sh/ruff/pull/27651))
- \[`pylint`\] Fix false positives and negatives with `%b` format character (`PLE1300`, `PLE1307`) ([#27560](https://github.com/astral-sh/ruff/pull/27560))
- \[`pylint`\] Improve handling of concatenated strings (`PLE1300`) ([#27659](https://github.com/astral-sh/ruff/pull/27659))

### Rule changes

- \[`numpy`\] Make `np.chararray` autofix backwards-compatible (`NPY201`) ([#27527](https://github.com/astral-sh/ruff/pull/27527))

### Performance

- Enable PGO for Linux x86-64 Ruff releases ([#27570](https://github.com/astral-sh/ruff/pull/27570))
- Enable PGO for Linux ARM64 Ruff releases ([#27574](https://github.com/astral-sh/ruff/pull/27574))
- Enable PGO for Windows x86-64 Ruff releases ([#27573](https://github.com/astral-sh/ruff/pull/27573))
- Enable PGO for macOS ARM64 Ruff releases ([#27572](https://github.com/astral-sh/ruff/pull/27572))
- Reduce `Expr` size to 64 bytes ([#27591](https://github.com/astral-sh/ruff/pull/27591))

### CLI

- Hyperlink rule codes in `ruff check --statistics` output ([#27646](https://github.com/astral-sh/ruff/pull/27646))

### Documentation

- \[`ruff`\] Also suggest `asyncio.TaskGroup` (`RUF006`) ([#27461](https://github.com/astral-sh/ruff/pull/27461))

### Other changes

- Use mimalloc v3 ([#27586](https://github.com/astral-sh/ruff/pull/27586))

### Contributors

- [@Andrej730](https://github.com/Andrej730)
- [@alonfaraj](https://github.com/alonfaraj)
- [@romero-deshaw](https://github.com/romero-deshaw)
- [@Avasam](https://github.com/Avasam)
- [@tjkuson](https://github.com/tjkuson)
- [@charliermarsh](https://github.com/charliermarsh)
- [@chirizxc](https://github.com/chirizxc)
- [@saberoueslati](https://github.com/saberoueslati)
- [@MichaReiser](https://github.com/MichaReiser)

## Install ruff 0.16.3

### Install prebuilt binaries via shell script

```sh
curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-installer.sh | sh
```

### Install prebuilt binaries via powershell script

```sh
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-installer.ps1 | iex"
```

## Download ruff 0.16.3

|  File  | Platform | Checksum |
|--------|----------|----------|
| [ruff-aarch64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-apple-darwin.tar.gz) | Apple Silicon macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-apple-darwin.tar.gz.sha256) |
| [ruff-x86_64-apple-darwin.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-apple-darwin.tar.gz) | Intel macOS | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-apple-darwin.tar.gz.sha256) |
| [ruff-aarch64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-pc-windows-msvc.zip) | ARM64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-pc-windows-msvc.zip.sha256) |
| [ruff-i686-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-pc-windows-msvc.zip) | x86 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-pc-windows-msvc.zip.sha256) |
| [ruff-x86_64-pc-windows-msvc.zip](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-pc-windows-msvc.zip) | x64 Windows | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-pc-windows-msvc.zip.sha256) |
| [ruff-aarch64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-unknown-linux-gnu.tar.gz) | ARM64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-i686-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-unknown-linux-gnu.tar.gz) | x86 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-powerpc64-unknown-linux-gnu.tar.gz) | PPC64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-powerpc64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-powerpc64le-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-powerpc64le-unknown-linux-gnu.tar.gz) | PPC64LE Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-powerpc64le-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-riscv64gc-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-riscv64gc-unknown-linux-gnu.tar.gz) | RISCV Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-riscv64gc-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-s390x-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-s390x-unknown-linux-gnu.tar.gz) | S390x Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-s390x-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-x86_64-unknown-linux-gnu.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-unknown-linux-gnu.tar.gz) | x64 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-unknown-linux-gnu.tar.gz.sha256) |
| [ruff-armv7-unknown-linux-gnueabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-armv7-unknown-linux-gnueabihf.tar.gz) | ARMv7 Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-armv7-unknown-linux-gnueabihf.tar.gz.sha256) |
| [ruff-aarch64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-unknown-linux-musl.tar.gz) | ARM64 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-aarch64-unknown-linux-musl.tar.gz.sha256) |
| [ruff-i686-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-unknown-linux-musl.tar.gz) | x86 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-i686-unknown-linux-musl.tar.gz.sha256) |
| [ruff-x86_64-unknown-linux-musl.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-unknown-linux-musl.tar.gz) | x64 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-x86_64-unknown-linux-musl.tar.gz.sha256) |
| [ruff-arm-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-arm-unknown-linux-musleabihf.tar.gz) | ARMv6 MUSL Linux (Hardfloat) | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-arm-unknown-linux-musleabihf.tar.gz.sha256) |
| [ruff-armv7-unknown-linux-musleabihf.tar.gz](https://releases.astral.sh/github/ruff/releases/download/0.16.3/ruff-armv7-unknown-linux-musleabihf.tar.gz) | ARMv7 MUSL Linux | [checksum](https://releases.astral.sh/github/ruff/releases/download/0.16.3/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>
```