Check out the [blog post](https://astral.sh/blog/ruff-v0.5.0) for a migration guide and overview of the changes!

Breaking changes

See also, the "Remapped rules" section which may result in disabled rules.

- Follow the XDG specification to discover user-level configurations on macOS (same as on other Unix platforms)
- Selecting `ALL` now excludes deprecated rules
- The released archives now include an extra level of nesting, which can be removed with `--strip-components=1` when untarring.
- The release artifact's file name no longer includes the version tag. This enables users to install via `/latest` URLs on GitHub.

Deprecations

The following rules are now deprecated:

- [`syntax-error`](https://docs.astral.sh/ruff/rules/syntax-error/) (`E999`): Syntax errors are now always shown

Remapped rules

The following rules have been remapped to new rule codes:

- [`blocking-http-call-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-http-call-in-async-function/): `ASYNC100` to `ASYNC210`
- [`open-sleep-or-subprocess-in-async-function`](https://docs.astral.sh/ruff/rules/open-sleep-or-subprocess-in-async-function/): `ASYNC101` split into `ASYNC220`, `ASYNC221`, `ASYNC230`, and `ASYNC251`
- [`blocking-os-call-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-os-call-in-async-function/): `ASYNC102` has been merged into `ASYNC220` and `ASYNC221`
- [`trio-timeout-without-await`](https://docs.astral.sh/ruff/rules/trio-timeout-without-await/): `TRIO100` to `ASYNC100`
- [`trio-sync-call`](https://docs.astral.sh/ruff/rules/trio-sync-call/): `TRIO105` to `ASYNC105`
- [`trio-async-function-with-timeout`](https://docs.astral.sh/ruff/rules/trio-async-function-with-timeout/): `TRIO109` to `ASYNC109`
- [`trio-unneeded-sleep`](https://docs.astral.sh/ruff/rules/trio-unneeded-sleep/): `TRIO110` to `ASYNC110`
- [`trio-zero-sleep-call`](https://docs.astral.sh/ruff/rules/trio-zero-sleep-call/): `TRIO115` to `ASYNC115`
- [`repeated-isinstance-calls`](https://docs.astral.sh/ruff/rules/repeated-isinstance-calls/): `PLR1701` to `SIM101`

Stabilization

The following rules have been stabilized and are no longer in preview:

- [`mutable-fromkeys-value`](https://docs.astral.sh/ruff/rules/mutable-fromkeys-value/) (`RUF024`)
- [`default-factory-kwarg`](https://docs.astral.sh/ruff/rules/default-factory-kwarg/) (`RUF026`)
- [`django-extra`](https://docs.astral.sh/ruff/rules/django-extra/) (`S610`)
- [`manual-dict-comprehension`](https://docs.astral.sh/ruff/rules/manual-dict-comprehension/) (`PERF403`)
- [`print-empty-string`](https://docs.astral.sh/ruff/rules/print-empty-string/) (`FURB105`)
- [`readlines-in-for`](https://docs.astral.sh/ruff/rules/readlines-in-for/) (`FURB129`)
- [`if-expr-min-max`](https://docs.astral.sh/ruff/rules/if-expr-min-max/) (`FURB136`)
- [`bit-count`](https://docs.astral.sh/ruff/rules/bit-count/) (`FURB161`)
- [`redundant-log-base`](https://docs.astral.sh/ruff/rules/redundant-log-base/) (`FURB163`)
- [`regex-flag-alias`](https://docs.astral.sh/ruff/rules/regex-flag-alias/) (`FURB167`)
- [`isinstance-type-none`](https://docs.astral.sh/ruff/rules/isinstance-type-none/) (`FURB168`)
- [`type-none-comparison`](https://docs.astral.sh/ruff/rules/type-none-comparison/) (`FURB169`)
- [`implicit-cwd`](https://docs.astral.sh/ruff/rules/implicit-cwd/) (`FURB177`)
- [`hashlib-digest-hex`](https://docs.astral.sh/ruff/rules/hashlib-digest-hex/) (`FURB181`)
- [`list-reverse-copy`](https://docs.astral.sh/ruff/rules/list-reverse-copy/) (`FURB187`)
- [`bad-open-mode`](https://docs.astral.sh/ruff/rules/bad-open-mode/) (`PLW1501`)
- [`empty-comment`](https://docs.astral.sh/ruff/rules/empty-comment/) (`PLR2044`)
- [`global-at-module-level`](https://docs.astral.sh/ruff/rules/global-at-module-level/) (`PLW0604`)
- [`misplaced-bare-raise`](https://docs.astral.sh/ruff/rules/misplaced-bare-raise%60/) (`PLE0744`)
- [`non-ascii-import-name`](https://docs.astral.sh/ruff/rules/non-ascii-import-name/) (`PLC2403`)
- [`non-ascii-name`](https://docs.astral.sh/ruff/rules/non-ascii-name/) (`PLC2401`)
- [`nonlocal-and-global`](https://docs.astral.sh/ruff/rules/nonlocal-and-global/) (`PLE0115`)
- [`potential-index-error`](https://docs.astral.sh/ruff/rules/potential-index-error/) (`PLE0643`)
- [`redeclared-assigned-name`](https://docs.astral.sh/ruff/rules/redeclared-assigned-name/) (`PLW0128`)
- [`redefined-argument-from-local`](https://docs.astral.sh/ruff/rules/redefined-argument-from-local/) (`PLR1704`)
- [`repeated-keyword-argument`](https://docs.astral.sh/ruff/rules/repeated-keyword-argument/) (`PLE1132`)
- [`super-without-brackets`](https://docs.astral.sh/ruff/rules/super-without-brackets/) (`PLW0245`)
- [`unnecessary-list-index-lookup`](https://docs.astral.sh/ruff/rules/unnecessary-list-index-lookup/) (`PLR1736`)
- [`useless-exception-statement`](https://docs.astral.sh/ruff/rules/useless-exception-statement/) (`PLW0133`)
- [`useless-with-lock`](https://docs.astral.sh/ruff/rules/useless-with-lock/) (`PLW2101`)

The following behaviors have been stabilized:

- [`is-literal`](https://docs.astral.sh/ruff/rules/is-literal/) (`F632`) now warns for identity checks against list, set or dictionary literals
- [`needless-bool`](https://docs.astral.sh/ruff/rules/needless-bool/) (`SIM103`) now detects `if` expressions with implicit `else` branches
- [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file/) (`E402`) now allows `os.environ` modifications between import statements
- [`type-comparison`](https://docs.astral.sh/ruff/rules/type-comparison/) (`E721`) now allows idioms such as `type(x) is int`
- [`yoda-condition`](https://docs.astral.sh/ruff/rules/yoda-conditions/) (`SIM300`) now flags a wider range of expressions

Removals

The following deprecated settings have been removed:

- `output-format=text`; use `output-format=concise` or `output-format=full`
- `tab-size`; use `indent-width`

The following deprecated CLI options have been removed:

- `--show-source`; use `--output-format=full`
- `--no-show-source`; use `--output-format=concise`

The following deprecated CLI commands have been removed:

- `ruff <path>`; use `ruff check <path>`
- `ruff --clean`; use `ruff clean`
- `ruff --generate-shell-completion`; use `ruff generate-shell-completion`

Preview features

- \[`ruff`\] Add `assert-with-print-message` rule ([11981](https://github.com/astral-sh/ruff/pull/11981))

CLI

- Use rule name rather than message in `--statistics` ([11697](https://github.com/astral-sh/ruff/pull/11697))
- Use the output format `full` by default ([12010](https://github.com/astral-sh/ruff/pull/12010))
- Don't log syntax errors to the console ([11902](https://github.com/astral-sh/ruff/pull/11902))

Rule changes

- \[`ruff`\] Fix false positives if `gettext` is imported using an alias (`RUF027`) ([12025](https://github.com/astral-sh/ruff/pull/12025))
- \[`npy`\] Update `trapz` and `in1d` deprecation (`NPY201`) ([11948](https://github.com/astral-sh/ruff/pull/11948))
- \[`flake8-bandit`\] Modify diagnostic ranges for shell-related rules ([10667](https://github.com/astral-sh/ruff/pull/10667))

Server

- Closing an untitled, unsaved notebook document no longer throws an error ([11942](https://github.com/astral-sh/ruff/pull/11942))
- Support the usage of tildes and environment variables in `logFile` ([11945](https://github.com/astral-sh/ruff/pull/11945))
- Add option to configure whether to show syntax errors ([12059](https://github.com/astral-sh/ruff/pull/12059))

Bug fixes

- \[`pycodestyle`\] Avoid `E203` for f-string debug expression ([12024](https://github.com/astral-sh/ruff/pull/12024))
- \[`pep8-naming`\] Match import-name ignores against both name and alias (`N812`, `N817`) ([12033](https://github.com/astral-sh/ruff/pull/12033))
- \[`pyflakes`\] Detect assignments that shadow definitions (`F811`) ([11961](https://github.com/astral-sh/ruff/pull/11961))

Parser

- Emit a syntax error for an empty type parameter list ([12030](https://github.com/astral-sh/ruff/pull/12030))
- Avoid consuming the newline for unterminated strings ([12067](https://github.com/astral-sh/ruff/pull/12067))
- Do not include the newline in the unterminated string range ([12017](https://github.com/astral-sh/ruff/pull/12017))
- Use the correct range to highlight line continuation errors ([12016](https://github.com/astral-sh/ruff/pull/12016))
- Consider 2-character EOL before line continuations ([12035](https://github.com/astral-sh/ruff/pull/12035))
- Consider line continuation character for re-lexing ([12008](https://github.com/astral-sh/ruff/pull/12008))

Other changes

- Upgrade the Unicode table used for measuring the line-length ([11194](https://github.com/astral-sh/ruff/pull/11194))
- Remove the deprecation error message for the nursery selector ([10172](https://github.com/astral-sh/ruff/pull/10172))