# Cal.com v5.6.15 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.6.15
- **Released:** Sep 08, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.6.15/

## Executive Summary (TL;DR)
Cal.com v5.6.15. Source highlight: feat: update translations via @LingoDotDev

## New Features
- feat: update translations via @LingoDotDev
- feat: update translations via @LingoDotDev
- docs: add getBusyTimes API documentation and update usage details
- feat: add time-based cancellation fees for no-show fee events
- feat: update translations via @LingoDotDev
- chore: Add .mdx to all checks ignore list

## Improvements
- perf: Delete `viewer.public.session` tRPC endpoint
- chore: improve local testing retell
- perf: optimize public event query by using lightweight session lookup
- perf: Create 'heavy' eventTypes router

## Bug Fixes
- fix: Pbac NITS found in dog food tesitng (I18n)
- fix: Calendar Event getting orphaned if location changes.
- fix: Switch component thumb positioning in RTL languages
- fix: resolve Sentry version conflicts and import-in-the-middle error
- fix: fix few e2e flakes
- fix: use `disableToasts` for handling notifications in `EventTypeSettings` atom