# Cal.com v5.5.9 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.5.9
- **Released:** Jul 31, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.5.9/

## Executive Summary (TL;DR)
Cal.com v5.5.9. Source highlight: fix: resolve type error causing CI failure

## New Features
- feat: BTCPay Server App
- feat: add race condition test with dynamic date selection
- feat: rename repository files to include Repository suffix
- feat: Support an array response for a field when used as `Value of Field`
- feat: Improving Booking Visibility at Month-End
- feat: enable PBAC checking on organization settings page

## Bug Fixes
- fix: resolve type error causing CI failure
- fix: improve error messages for PayPal credential validation
- fix: alignment of time unit select box content
- fix: center-align timezone and edit availability button on mobile layout
- fix: skip last name check when creating a booking in v2
- fix: date overrides for availability settings atom