# Cal.com v5.2.9 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.2.9
- **Released:** May 05, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.2.9/

## Executive Summary (TL;DR)
Cal.com v5.2.9. Source highlight: refactor: Replace attendee email with user id in idempotency key

## New Features
- feat: verified resources endpoint [v2]
- feat: add membership creation date to Organization Member List table (CAL-5406)
- build(packages/features): resolved type error when building `apps/web`.
- feat: booking URL validation to accept links without explicit mention of https://
- chore: Add proton.me to email provider list

## Improvements
- perf: remove unnecessary routes from middleware

## Bug Fixes
- fix: disabled sms hanging, by calling resolve()
- fix: rf v3 tidy up mobile issues
- fix: between operator for attribute matching
- fix: wrong info on cancelled email
- fix: return for dry run
- fix: Read user id properly when generating idempotency key