diff --git a/CHANGELOG.md b/CHANGELOG.md
index b81324d669..4283d59a67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,18 +4,24 @@
 
 ---
 
-## [3.5.3] - 2026-04-06
+## [3.5.3] - 2026-04-07
 
 ### Security
 
+- **Vulnerabilities:** Fully remediated 12 High-Severity CodeQL vulnerabilities by migrating from Math.random to `crypto.randomUUID()`, wrapping SSE injection points with aggressive backslash escaping, sanitizing trailing HTTP fragments, and enforcing rigid SSRF HTTP verification schemes across internal routes.
 - **Dependencies:** Upgraded Next.js to `^16.2.2` and Vite to `>=8.0.5` resolving critical DoS, arbitrary file reads and CSRF vectors in the build/server environments.
 
 ### Fixed
 
+- **E2E Stability:** Eliminated extreme CI unreliability and transient test timeouts (Playwright) by propagating internal standalone `_next/static` assets properly and refactoring deep UI interactions inside defensive `expect().toPass()` loops.
 - **Middleware:** Resolved infinite redirect loop on dashboard for fresh instances when requireLogin is disabled.
 - **Core Fallbacks:** Preserved primary failure contexts and enhanced Edge-case error handling pipelines across chat and fallback loops.
 - **Proxy/Hooks:** Optimized local git hooks, normalized token coverage endpoints into `/coverage`, and guarded GLM region lookups.
 
+### 🛠️ Maintenance
+
+- **CI/CD Stabilization:** Prevented random GitHub Runner freezes by decoupling sharded processes, adjusting test concurrencies, unref-ing active connections on server teardown, and strictly capping job timeout durations.
+
 ### Documentation
 
 - **I18n Engine:** Synchronized and pushed deep Machine Translation updates across all 32 natively-supported languages (682 translation nodes aligned).