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Ruff now enables 413 rules by default, up from 59 in previous versions.

Ruff v0.16.0 dramatically expanded its default rule set from 59 to 413 rules. ✦ AI generated

Brent Westbrook · Simon Willison's Weblog · 2026-07-25 · original ↗

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Ruff now enables 413 rules by default, up from 59 in previous versions.

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✳ Ruff ◉ Brent Westbrook

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Mechanism · 1

Many of the 968 rules that were not previously enabled by default catch severe issues including syntax errors and immediate runtime errors, and will now be brought to developers' attention without any Ruff configuration.Brent Westbrook · Simon Willison's Weblog · conf 90%

In practice · 1

Running the latest Ruff against my three biggest projects — Datasette, sqlite-utils, and LLM — found hundreds of minor issues that breached the new default rules, and the upgrade was safe because all three projects have comprehensive test suites running against Python 3.10 through 3.14.Simon Willison · Simon Willison's Weblog · conf 95%

Extends · 1

Ruff v0.16.0 now enables 413 rules by default, up from 59 in previous versions, dramatically increasing its default linting coverage.Brent Westbrook · Simon Willison's Weblog · conf 90%

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extends → Running Ruff v0.16.0 against my three biggest Python projects found hundreds of minor issues, but comprehensive test suites made the upgrade safe.Brent Westbrook · Simon Willison's Weblog