# Tailwind CSS v4.1.5 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.1.5
- **Released:** Apr 30, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.1.5/

## Executive Summary (TL;DR)
Tailwind CSS v4.1.5. Source highlight: Support using `@tailwindcss/upgrade` to upgrade between versions of v4.* (#17717)

## New Features
- Support using `@tailwindcss/upgrade` to upgrade between versions of v4.* (#17717)
- Add `h-lh` / `min-h-lh` / `max-h-lh` utilities (#17790)
- Transition `display`, `visibility`, `content-visibility`, `overlay`, and `pointer-events` when using `transition` to simplify `@starting-style` usage (#17812)

## Bug Fixes
- Don't scan `.geojson` or `.db` files for classes by default (#17700, #17711)
- Hide default shadow suggestions when missing default shadow theme keys (#17743)
- Replace `_` with `.` in theme suggestions for `@utility` if surrounded by digits (#17733)
- Skip `color-mix(…)` when opacity is `100%` (#17815)
- PostCSS: Ensure that errors in imported stylesheets are recoverable (#17754)
- Upgrade: Bump all Tailwind CSS related dependencies during upgrade (#17763)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.1.5
```