# Tailwind CSS v4.1.17 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.1.17
- **Released:** Nov 06, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.1.17/

## Executive Summary (TL;DR)
Tailwind CSS v4.1.17. Source highlight: Substitute `@variant` inside legacy JS APIs (#19263)

## Bug Fixes
- Substitute `@variant` inside legacy JS APIs (#19263)
- Prevent occasional crash on Windows when loaded into a worker thread (#19242)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.1.17
```