# Tailwind CSS v0.4.2 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v0.4.2
- **Released:** Mar 01, 2018
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v0.4.2/

## Executive Summary (TL;DR)
Tailwind CSS v0.4.2. Source highlight: Fix an issue where borders couldn't be applied to `img` tags without specifying a border style (#362, #363)

## New Features
- Add support for using a function to define class prefixes in addition to a simple string (#367)

## Improvements
- Improve the performance of `@apply` by using a lookup table instead of searching (#401)

## Bug Fixes
- Fix an issue where borders couldn't be applied to `img` tags without specifying a border style (#362, #363)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@0.4.2
```