diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec3b252d..30ac713f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - Upgrade to Chart.js v3.8.0 ([#204](https://github.com/jpanther/congo/pull/204))
 - Upgrade to KaTeX v0.16.0 ([#208](https://github.com/jpanther/congo/pull/208))
+- Upgrade to Mermaid v9.1.2 ([#214](https://github.com/jpanther/congo/pull/214))
 
 ## [2.2.1] - 2022-05-25