# Vitest v0.15.0 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v0.15.0
- **Released:** Jun 14, 2022
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v0.15.0/

## Executive Summary (TL;DR)
Vitest v0.15.0. Source highlight:    🚀 Features

## New Features
- Bind expect state to context `#1468`
- Introduce `VITEST_POOL_ID` `#1473`
- Add `maxConcurrency` option, `5` by default `#1483`
- Add --shard command `#1477`
- Add `css` config option, don't process CSS by default `#1467`

## Bug Fixes
- Null inside test.each is not turned into an empty array `#1462`
- Add @types/node to dependencies `#1474`
- Parent is defined on global, closes `#1489`
- Ensure event listener functions are bound correctly `#1487`