# Cal.com v6.0.4 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v6.0.4
- **Released:** Dec 23, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v6.0.4/

## Executive Summary (TL;DR)
Cal.com v6.0.4. Source highlight: fix: Handle error when no default calendar exists for a o365 account

## New Features
- feat(companion): Add Google Calendar mark no-show functionality
- feat: upgrade apps/web to Next.js 16.1.0
- feat: upgrade api/v1 and example apps to Next.js 16.1.0
- perf: add z.ZodType annotations to high-impact schemas
- Add versioned webhook payload reference with interactive selection by @mintlify[bot] in https://github.com/calcom/cal.com/pull/26008
- docs: Add anchor links to webhook version tabs by @mintlify[bot] in https://github.com/calcom/cal.com/pull/26118

## Improvements
- perf: use compound key in event types repository
- perf: (googlecalendar): batch freebusy calls by delegation credential
- perf: pass app data to OmniInstallAppButton to avoid redundant API calls

## Bug Fixes
- fix: Handle error when no default calendar exists for a o365 account
- fix: add missing Korean translations
- fix: slots in email embed sorted
- fix: cache build error on CI
- fix: E2E flakes after splitting the tests
- fix: fix credential type mismatch in AppPage component