# Tailwind CSS v4.2.0 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.2.0
- **Released:** Feb 18, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.2.0/

## Executive Summary (TL;DR)
Tailwind CSS v4.2.0. Source highlight: Add mauve, olive, mist, and taupe color palettes to the default theme (#19627)

## New Features
- Add mauve, olive, mist, and taupe color palettes to the default theme (#19627)
- Add `@tailwindcss/webpack` package to run Tailwind CSS as a webpack plugin (#19610)
- Add `pbs-*` and `pbe-*` utilities for `padding-block-start` and `padding-block-end` (#19601)
- Add `mbs-*` and `mbe-*` utilities for `margin-block-start` and `margin-block-end` (#19601)
- Add `scroll-pbs-*` and `scroll-pbe-*` utilities for `scroll-padding-block-start` and `scroll-padding-block-end` (#19601)
- Add `scroll-mbs-*` and `scroll-mbe-*` utilities for `scroll-margin-block-start` and `scroll-margin-block-end` (#19601)

## Bug Fixes
- Prevent double `@supports` wrapper for `color-mix` values (#19450)
- Allow whitespace around `@source inline()` argument (#19461)
- Emit comment when source maps are saved to files when using `@tailwindcss/cli` (#19447)
- Detect utilities containing capital letters followed by numbers (#19465)
- Fix class extraction for Rails' strict locals (#19525)
- Align `@utility` name validation with Oxide scanner rules (#19524)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.2.0
```