diff --git a/static/js/theme.js b/static/js/theme.js
index 0791ad1220..88a6f92b8b 100644
--- a/static/js/theme.js
+++ b/static/js/theme.js
@@ -276,7 +276,8 @@ function initMermaid( update, attrs ) {
     }
     var is_initialized = ( update ? update_func( attrs ) : init_func( attrs ) );
     if( is_initialized ){
-        mermaid.init( {theme: attrs.theme} );
+        mermaid.initialize( Object.assign( { "securityLevel": "antiscript", "startOnLoad": false }, window.relearn.mermaidConfig, { theme: attrs.theme } ) );
+        mermaid.run();
         // zoom for Mermaid
         // https://github.com/mermaid-js/mermaid/issues/1860#issuecomment-1345440607
         var svgs = d3.selectAll( '.mermaid.zoom svg' );
@@ -1345,6 +1346,7 @@ function useMermaid( config ){
         // We don't support Mermaid for IE11 anyways, so bail out early
         return;
     }
+    window.relearn.mermaidConfig = config;
     if (typeof mermaid != 'undefined' && typeof mermaid.mermaidAPI != 'undefined') {
         mermaid.initialize( Object.assign( { "securityLevel": "antiscript", "startOnLoad": false }, config ) );
         if( config.theme && variants ){