diff --git a/mkdocs.yml b/mkdocs.yml
index 177c539..370e9e5 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -20,7 +20,8 @@ theme:
       name: Switch to dark mode
 plugins:
   - search
-  - mermaid2
+  - mermaid2:
+      version: 10.9.0
 nav:
 #  - Home: home.md
   - Index: index.md