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Tailwind CSS v4.1.9stable Released Jun 11, 2025
Impact Score: 5/10

Tailwind CSS v4.1.9 — 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 v4.1.9. Source highlight: Correctly parse custom properties with strings containing semicolons (#18251)

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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)

  • Correctly parse custom properties with strings containing semicolons (#18251)
  • Upgrade: Migrate arbitrary modifiers without percentage signs to bare values (e.g. `/[0.16]` → `/16`) (#18184)
  • Upgrade: Migrate CSS variable shorthands where fallback value contains function call (#18184)
  • Upgrade: Migrate negative arbitrary values to negative bare values (e.g. `mb-[-32rem]` → `-mb-128`) (#18212)
  • Upgrade: Do not migrate `blur` in `wire:model.blur` (#18216)
  • Don't add spaces around CSS dashed idents when formatting math expressions (#18220)
📄 View Raw Release Notes (Original Developer Log)
### Fixed - Correctly parse custom properties with strings containing semicolons ([#18251](https://github.com/tailwindlabs/tailwindcss/pull/18251)) - Upgrade: Migrate arbitrary modifiers without percentage signs to bare values (e.g. `/[0.16]` → `/16`) ([#18184](https://github.com/tailwindlabs/tailwindcss/pull/18184)) - Upgrade: Migrate CSS variable shorthands where fallback value contains function call ([#18184](https://github.com/tailwindlabs/tailwindcss/pull/18184)) - Upgrade: Migrate negative arbitrary values to negative bare values (e.g. `mb-[-32rem]` → `-mb-128`) ([#18212](https://github.com/tailwindlabs/tailwindcss/pull/18212)) - Upgrade: Do not migrate `blur` in `wire:model.blur` ([#18216](https://github.com/tailwindlabs/tailwindcss/pull/18216)) - Don't add spaces around CSS dashed idents when formatting math expressions ([#18220](https://github.com/tailwindlabs/tailwindcss/pull/18220))
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