# Tailwind CSS v4.1.3 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.1.3
- **Released:** Apr 04, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.1.3/

## Executive Summary (TL;DR)
Tailwind CSS v4.1.3. Source highlight: Show warning when using unsupported bare value data type in `--value(…)` (#17464)

## Bug Fixes
- Show warning when using unsupported bare value data type in `--value(…)` (#17464)
- PostCSS: Ensure changes to the input CSS file don't generate stale output when using Turbopack (#17554)
- Ensure classes are detected in Ruby's `%w` syntax in Slim templates (#17557)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.1.3
```