# Tailwind CSS v3.1.5 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v3.1.5
- **Released:** Jul 07, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v3.1.5/

## Executive Summary (TL;DR)
Tailwind CSS v3.1.5. Source highlight: Support configuring a default `font-weight` for each font size utility (#8763)

## New Features
- Support configuring a default `font-weight` for each font size utility (#8763)
- Add support for alpha values in safe list (#8774)

## Bug Fixes
- Improve types to support fallback values in the CSS-in-JS syntax used in plugin APIs (#8762)
- Support including `tailwindcss` and `autoprefixer` in `postcss.config.js` in standalone CLI (#8769)
- Fix using special-characters as prefixes (#8772)
- Don’t prefix classes used within arbitrary variants (#8773)
- Add more explicit types for the default theme (#8780)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@3.1.5
```