# Cal.com v5.9.9 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.9.9
- **Released:** Dec 05, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.9.9/

## Executive Summary (TL;DR)
Cal.com v5.9.9. Source highlight: fix: UI nits in QA verison of onboarding v3

## New Features
- feat: companion expo and chrome
- feat: Disable booking emails to guests
- feat: add data region dropdown to signup page
- feat: add session endpoint and booking access pbac
- feat: distributed tracing - 3
- chore: add atoms changeset for tailwind v4

## Improvements
- style: improve dropdown option spacing and hover separation
- perf: handleChildrenEventTypes transaction

## Bug Fixes
- fix: UI nits in QA verison of onboarding v3
- fix: simplify date range picker to Airbnb-style selection
- fix: prevent clicking outside
- fix: unable to edit member as a team owner/admin
- fix: e2e flake visible on CI
- fix: error spam for pbac is not enabled on this team