# Cal.com v5.1.18 — Release & Upgrade Intelligence
- **Product:** Cal.com (https://cal.com)
- **Version:** v5.1.18
- **Released:** Apr 08, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/calcom/updates/v5.1.18/

## Executive Summary (TL;DR)
Cal.com v5.1.18. Source highlight: revert: "chore: Migration to backfill EventType.userId with B, if null"

## New Features
- revert: "feat: enable 'Overlay Calendar' enabled by default for signe…
- chore: Add id column in CalendarCache
- feat: sticky-shell in event-types
- feat: restrict attributes tab to admin/owners only (CAL-4852)
- feat: Salesforce - on booking cancel, write to event object

## Bug Fixes
- fix: Layout is not being set properly on mobile screens
- fix: weight filter should never return length=0
- fix: use real ip in throttler [v2]
- fix: Incorrect booker URL for individual event types inside the org
- fix(CAL-5435): Conditionally render selection bar buttons based on user role
- fix: A few flakes