diff --git a/packages/mermaid/src/docs/.vitepress/config.ts b/packages/mermaid/src/docs/.vitepress/config.ts
index db686fd99e9..450fc6156c3 100644
--- a/packages/mermaid/src/docs/.vitepress/config.ts
+++ b/packages/mermaid/src/docs/.vitepress/config.ts
@@ -4,7 +4,10 @@ import { defineConfig, MarkdownOptions } from 'vitepress';
 
 const allMarkdownTransformers: MarkdownOptions = {
   // the shiki theme to highlight code blocks
-  theme: 'github-light',
+  theme: {
+    light: 'github-light',
+    dark: 'github-dark'
+  },
   config: async (md) => {
     await MermaidExample(md);
   },