# Tailwind CSS v4.0.16 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.0.16
- **Released:** Mar 25, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.0.16/

## Executive Summary (TL;DR)
Tailwind CSS v4.0.16. Source highlight: Add support for literal values in `--value('…')` and `--modifier('…')` (#17304)

## New Features
- Add support for literal values in `--value('…')` and `--modifier('…')` (#17304)

## Bug Fixes
- Fix class extraction followed by `(` in Pug (#17320)
- Ensure `@keyframes` for theme animations are emitted if they are referenced following a comma (#17352)
- Vite: Ensure that updates to an imported CSS file are properly propagated after updating source files (#17347)
- Pre process `Slim` templates embedded in Ruby files (#17336)
- Error when input and output files resolve to the same file when using the CLI (#17311)
- Add missing suggestions when `--spacing(--value(integer, number))` is used (#17308)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.0.16
```