# Vitest v4.1.11 — Release & Upgrade Intelligence
- **Product:** Vitest (https://vitest.dev)
- **Version:** v4.1.11
- **Released:** Aug 18, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/vitest/updates/v4.1.11/

## Executive Summary (TL;DR)
Vitest v4.1.11. Source highlight:    🐞 Bug Fixes

## Bug Fixes
- Revive global concurrency limit for test lifecycle [backport to v4] &nbsp;-&nbsp; by @sheremet-va and @hi-ogawa in https://github.com/vitest-dev/vitest/issues/10992 <samp>(5146d)</samp>
- Encode iframeId in tester iframe URL [backport to v4] &nbsp;-&nbsp; by @sheremet-va, **Pduhard** and **Claude Opus 4.8** in https://github.com/vitest-dev/vitest/issues/10955 <samp>(10b2c)</samp>
- Trigger playwright/chromium gc on lower disk availability [backport to v4] &nbsp;-&nbsp; by @hi-ogawa, **Hiroshi Ogawa** and **OpenCode** in https://github.com/vitest-dev/vitest/issues/10951 <samp>(9851d)</samp>
- Restrict redirect mocks to the fs allowlist [backport to v4] &nbsp;-&nbsp; by @sheremet-va in https://github.com/vitest-dev/vitest/issues/10974 <samp>(fe5a1)</samp>