# Tailwind CSS v3.1.0 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v3.1.0
- **Released:** Jun 09, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v3.1.0/

## Executive Summary (TL;DR)
Tailwind CSS v3.1.0. Source highlight: We just released Tailwind CSS v3.1 — the first new feature release since v3.0 came out last year!

## New Features
- Support PostCSS `Document` nodes (#7291)
- Add `text-start` and `text-end` utilities (#6656)
- Support customizing class name when using `darkMode: 'class'` (#5800)
- Add `--poll` option to the CLI (#7725)
- Add new `border-spacing` utilities (#7102)
- Add `enabled` variant (#7905)

## Bug Fixes
- Types: allow for arbitrary theme values (for 3rd party plugins) (#7926)
- Don’t split vars with numbers in them inside arbitrary values (#8091)
- Require matching prefix when detecting negatives (#8121)
- Handle duplicate At Rules without children (#8122)
- Allow arbitrary values with commas in `@apply` (#8125)
- Fix intellisense for plugins with multiple `@apply` rules (#8213)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@3.1.0
```