# Vitest v4.1.7 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v4.1.7
- **Released:** May 20, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v4.1.7/

## Executive Summary (TL;DR)
Vitest v4.1.7. Source highlight:    🐞 Bug Fixes

## Bug Fixes
- **runner**: Limit concurrency per task branch in addition to per leaf callbacks (backport) &nbsp;-&nbsp; by @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10384 <samp>(4f0f2)</samp>