0.17.0 0.17.1

Name: ruff
Author: astral-sh

low risk

astral-sh/ruffOct 9, 2026 → Oct 15, 20266 days between releases

What's New

Fixes dedent and flake8-pyi bugs; adds preview feature for boolean literal keyword detection

New Features

Preview feature: Treat boolean literals as keywords (E271-E274)

Improvements

Treat more `collections` and `weakref` containers as mutable
Update default and example aliases for flake8-import-conventions

Bug Fixes

Fix dedent issues when multiple leading comments are present
Fix false positives in flake8-pyi for legacy positional-only parameters and quoted annotations
Avoid invalid comprehension suggestions (PERF401, PERF403)

Upgrade Notes

No configuration changes are required. The boolean literal preview feature must be explicitly enabled via settings. The mutable container rule change may trigger new linting warnings.

The Two Releases

0.17.0

Oct 9, 2026· 12 days ago

Ruff 0.17.0 enhances security by code-signing executables on macOS and Windows and updates default Python versions to 3.11 and 3.15. The release also removes legacy support for ruff-lsp and the Python dependency from conda-forge builds, while introducing support for Unicode 17 and new linting conventions.

Full release notes

0.17.1

Oct 15, 2026· 6 days ago

This release focuses on bug fixes for dedent handling and flake8-pyi rules, along with a preview feature to treat boolean literals as keywords in pycodestyle.

Full release notes