# Appwrite 1.9.0 — Release & Upgrade Intelligence
- **Product:** Appwrite (https://appwrite.io)
- **Version:** 1.9.0
- **Released:** Apr 01, 2026
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/appwrite/updates/1.9.0/

## Executive Summary (TL;DR)
Appwrite 1.9.0. Source highlight: MongoDB support (#11312)

## Improvements
- Trusted headers — Improved client IP resolution via _APP_TRUSTED_HEADERS env var
- Realtime performance improvements (#11251)
- Cache key improvements with attribute/index hash

## Bug Fixes
- User impersonation — Admins can now impersonate users for debugging and support (#11533)
- Memory leak fixes in webhook/stats/event processing (#11067, #11241)
- OAuth fixes for custom domains, redirect schemes, and verified emails
- MFA recovery code validation fix
- VCS template flow, deployment, and comment fixes
- Schedule execution trigger and deletion fixes