Tailwind CSS v4.0.7 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: tailwind · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

$ npm install --save-exact [email protected]

📄 .MD

🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Tailwind CSS v4.0.7. Source highlight: Export `tailwindcss/lib/util/flattenColorPalette.js` for backward compatibility (#16411)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

🔧 Bug Fixes & Patches (6)

Export `tailwindcss/lib/util/flattenColorPalette.js` for backward compatibility (#16411)
Fix sorting of numeric utility suggestions when they have different magnitudes (#16414)
Show suggestions for fractions in IntelliSense (#16353)
Don’t replace `_` in suggested theme keys (#16433)
Ensure `--default-outline-width` can be used to change the `outline-width` value of the `outline` utility (#16469)
Ensure drop shadow utilities don't inherit unexpectedly (#16471)

📄 View Raw Release Notes (Original Developer Log)

### Fixed - Export `tailwindcss/lib/util/flattenColorPalette.js` for backward compatibility ([#16411](https://github.com/tailwindlabs/tailwindcss/pull/16411)) - Fix sorting of numeric utility suggestions when they have different magnitudes ([#16414](https://github.com/tailwindlabs/tailwindcss/pull/16414)) - Show suggestions for fractions in IntelliSense ([#16353](https://github.com/tailwindlabs/tailwindcss/pull/16353)) - Don’t replace `_` in suggested theme keys ([#16433](https://github.com/tailwindlabs/tailwindcss/pull/16433)) - Ensure `--default-outline-width` can be used to change the `outline-width` value of the `outline` utility ([#16469](https://github.com/tailwindlabs/tailwindcss/pull/16469)) - Ensure drop shadow utilities don't inherit unexpectedly ([#16471](https://github.com/tailwindlabs/tailwindcss/pull/16471)) - Export config and plugin types from `tailwindcss/plugin` for backward compatibility ([#16505](https://github.com/tailwindlabs/tailwindcss/pull/16505)) - Ensure JavaScript plugins that emit nested rules referencing the utility name work as expected ([#16539](https://github.com/tailwindlabs/tailwindcss/pull/16539)) - Statically link Visual Studio redistributables in `@tailwindcss/oxide` Windows builds ([#16602](https://github.com/tailwindlabs/tailwindcss/pull/16602)) - Ensure that Next.js splat routes are scanned for classes ([#16457](https://github.com/tailwindlabs/tailwindcss/pull/16457)) - Pin exact version of `tailwindcss` in `@tailwindcss/*` packages ([#16623](https://github.com/tailwindlabs/tailwindcss/pull/16623)) - Upgrade: Report errors when updating dependencies ([#16504](https://github.com/tailwindlabs/tailwindcss/pull/16504)) - Upgrade: Ensure a `darkMode` JS config setting with block syntax converts to use `@slot` ([#16507](https://github.com/tailwindlabs/tailwindcss/pull/16507)) - Upgrade: Ensure the latest version of `tailwindcss` and `@tailwindcss/postcss` are installed when upgrading ([#16620](https://github.com/tailwindlabs/tailwindcss/pull/16620))

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