# Cal.com v5.4.9 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.4.9
- **Released:** Jun 27, 2025
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.4.9/

## Executive Summary (TL;DR)
Cal.com v5.4.9. Source highlight: fix: show icon button when one item in array

## Breaking Changes & Deprecations
- fix: EventAvailabilityTab atom breaking by @SomayChauhan in https://github.com/calcom/cal.com/pull/22059

## New Features
- feat: Add `rerouting` to `AssignmentReasonRecorder`
- feat: Phone based bookings for everyone (#21320)

## Improvements
- perf: optimize slot conflict checking from O(n²) to O(n log n)

## Bug Fixes
- fix: show icon button when one item in array
- fix: changesets atoms release
- fix: add InsightsRoutingService and refactor InsightsBookingRepository
- fix: add avatar shapes to docs
- fix: no available users found (recurring events)
- fix: EventAvailabilityTab atom breaking