diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c877c3a..da20536d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - Updated German translation ([#475](https://github.com/jpanther/congo/pull/475))
 - Upgrade to Chart.js v4.2.1 ([#472](https://github.com/jpanther/congo/pull/472))
+- Upgrade to Mermaid v9.4.0 ([#473](https://github.com/jpanther/congo/pull/473))
 - Upgrade to Tailwind v3.2.7 ([#491](https://github.com/jpanther/congo/pull/491))
 
 ### Fixed