# Tailwind CSS v4.0.13 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.0.13
- **Released:** Mar 11, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.0.13/

## Executive Summary (TL;DR)
Tailwind CSS v4.0.13. Source highlight: Fix Haml pre-processing (#17051)

## Bug Fixes
- Fix Haml pre-processing (#17051)
- Ensure `.node` and `.wasm` files are not scanned for utilities (#17123)
- Improve performance when scanning JSON files (#17125)
- Fix extracting candidates containing dots in Haml, Pug, and Slim pre processors (#17094, #17085, #17113)
- Don't create invalid CSS when encountering a link wrapped in square brackets (#17129)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.0.13
```