diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13d3a022..121ecc87 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Changed
+
+- Upgrade to Mermaid v10.2.3 ([#577](https://github.com/jpanther/congo/pull/577), [#582](https://github.com/jpanther/congo/pull/582))
+
 ## [2.6.1] - 2023-06-04
 
 ### Changed