Ruff 0.16.1

Release Date: July 30, 2026

Ruff 0.16.1 has been released — a patch release for the fast Python linter and code formatter, bringing rule fixes, server improvements, and preview features.

Overview

Released on July 30, 2026, Ruff 0.16.1 is a targeted update that follows the major 0.16.0 release. This patch focuses on refining rule behaviour, fixing false positives, and improving the LSP (Language Server Protocol) integration.

Preview Features

Several preview features have been added or refined:

Human-readable names opt-out — A new option allows users to opt out of human-readable rule names, useful for teams that prefer strict code identifiers in their lint output
PT018 fixes safe by default — flake8-pytest-style fixes are now marked safe by default, with unsafe mode only triggered when comments are present
UP040, UP046, UP047 skip protection — pyupgrade fixes now correctly skip transformations when a defaulted TypeVar precedes a non-defaulted one, preventing invalid code generation
RUF065 false positive fix — The ruff-specific rule for unpacked arguments no longer fires in cases where the unpacking is legitimate

Bug Fixes

LSP resilience — The gen-lsp-types dependency has been bumped to gracefully handle unknown enumeration values in LSP protocol messages, meaning the language server won't crash when receiving unexpected data from editors
B008 immutability fix — flake8-bugbear's range is now correctly marked as immutable, eliminating false positives in the B008 check
C408 normalization — flake8-comprehensions now NFKC-normalizes keyword names in its C408 fix, ensuring consistent behaviour across Unicode inputs
RET504 false positive — flake8-return no longer flags a false positive when a variable is read inside a finally clause
RST directive detection — pydocstyle's section detection (D214, D405, D413) now correctly skips content inside RST directive bodies
FURB192 parenthesization — The refurb rule for unnecessary yield expressions now correctly parenthesizes yield arguments in its fix

Rule Changes

PT022 — flake8-pytest-style fixes are now marked as unsafe when they involve assertions in fixture teardown
FURB105 — Refurb fixes that remove unknown separators are now correctly marked as unsafe

Server Improvements

The LSP server received two notable updates: indexing of excluded nested Ruff workspaces has been fixed (so nested workspaces within excluded directories no longer break the server), and TOML files are now linted directly in the LSP, bringing configuration file linting into your editor workflow.

Documentation and Maintenance

The documentation has been updated with better coverage of pycon Markdown formatting, flake8-bandit's TYPE_CHECKING exception (S101), flake8-import-conventions' extend-aliases override behaviour, and pylint fix safety gotchas for non-augmented-assignment (PLR6104). The underlying annotate-snippets dependency has been vendored at the latest version, and syntax error noise has been reduced by swallowing dedents in the same way indents are handled.