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0.16.4

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@github-actions github-actions released this 20 Aug 17:44
Immutable release. Only release title and notes can be modified.
11c76bf

Release Notes

Released on 2026-08-20.

Preview features

  • [flake8-use-pathlib] Add autofix for PTH116 (#26460)
  • [refurb] Restrict delete-full-slice to lists (FURB131) (#27711)
  • [refurb] Skip FURB101 and FURB103 when the open argument is a file descriptor (#27643)

Bug fixes

  • Fix InvalidInstruction on Windows CPUs that do not support POPCNT (#27803)
  • [pyflakes] Emit semantic syntax errors in string type definitions as F722 (#27835)
  • [pylint] Allow os._exit imports in import-private-name (PLC2701) (#27738)

Rule changes

  • [syntax-errors] Align mixed t-string/bytes error message with CPython 3.14 (#27766)
  • [ruff] Add ctypes.LittleEndianStructure and related types to existing exception (RUF012) (#27753)
  • [syntax-errors] Detect duplicate keyword arguments (#17804)
  • [syntax-errors] Detect parameters declared nonlocal (#27628)

Server

  • Offer display-only fixes and mark safe fixes preferred (#27807)
  • Support pull diagnostics for notebook cells (#27779)

Documentation

  • Add default indicator to rules table (#27724)
  • Fix broken link to Python docs (#27757)

Other changes

  • Fix s390x stacker assembly in release builds (#27776)
  • Guarantee minimum stack size when parsing a module, standalone expression, and suites (#25464)
  • Reduce configuration deserialization code size (#27924)
  • Check packed AST index bounds (#27849)

Contributors

Install ruff 0.16.4

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.16.4/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.16.4/ruff-installer.ps1 | iex"

Download ruff 0.16.4

File Platform Checksum
ruff-aarch64-apple-darwin.tar.gz Apple Silicon macOS checksum
ruff-x86_64-apple-darwin.tar.gz Intel macOS checksum
ruff-aarch64-pc-windows-msvc.zip ARM64 Windows checksum
ruff-i686-pc-windows-msvc.zip x86 Windows checksum
ruff-x86_64-pc-windows-msvc.zip x64 Windows checksum
ruff-aarch64-unknown-linux-gnu.tar.gz ARM64 Linux checksum
ruff-i686-unknown-linux-gnu.tar.gz x86 Linux checksum
ruff-powerpc64-unknown-linux-gnu.tar.gz PPC64 Linux checksum
ruff-powerpc64le-unknown-linux-gnu.tar.gz PPC64LE Linux checksum
ruff-riscv64gc-unknown-linux-gnu.tar.gz RISCV Linux checksum
ruff-s390x-unknown-linux-gnu.tar.gz S390x Linux checksum
ruff-x86_64-unknown-linux-gnu.tar.gz x64 Linux checksum
ruff-armv7-unknown-linux-gnueabihf.tar.gz ARMv7 Linux checksum
ruff-aarch64-unknown-linux-musl.tar.gz ARM64 MUSL Linux checksum
ruff-i686-unknown-linux-musl.tar.gz x86 MUSL Linux checksum
ruff-x86_64-unknown-linux-musl.tar.gz x64 MUSL Linux checksum
ruff-arm-unknown-linux-musleabihf.tar.gz ARMv6 MUSL Linux (Hardfloat) checksum
ruff-armv7-unknown-linux-musleabihf.tar.gz ARMv7 MUSL Linux checksum

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:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ruff

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>