# Cal.com v5.3.8 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.3.8
- **Released:** May 28, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.3.8/

## Executive Summary (TL;DR)
Cal.com v5.3.8. Source highlight: perf: service worker and lifecycle method

## Improvements
- perf: service worker and lifecycle method

## Bug Fixes
- fix: Create separate calendar events to hide organizer
- fix: Variable fix
- fix: Function return type is illegal, not sure how this passed eslint
- fix: misaligned and undersized tick mark in timezone dropdown
- fix: only generate sms message bodies when needed
- fix: Logger in `SalesforceGraphQLClient`