# Cal.com v5.6.6 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.6.6
- **Released:** Aug 26, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.6.6/

## Executive Summary (TL;DR)
Cal.com v5.6.6. Source highlight: perf: do not use next/dist/server image optimizer

## New Features
- feat: add startsWith operator to routing forms
- feat: enable Stripe Adaptive Currencies for subscription flows
- feat: atoms e2e tests

## Improvements
- perf: do not use next/dist/server image optimizer
- refactor: improve most booked & least booked
- perf: Make /icons page a static page
- perf: Bundle English translation at build time and use dynamic imports for other assets and have HTTP call as a fallback

## Bug Fixes
- fix: show correct input type for location in FormBuilder
- fix: Missing `jose` module in `saml-jackson` package
- fix: german translation for button in the onboarding flow
- fix: Custom Event Redirect in Routing Form with Dropdown Based fields
- fix: getting error when userid passed into booking filters
- fix: fr and de translation for buttons on the onboarding flow