diff --git a/index.html b/index.html
index daae856cd..fa98270f0 100644
--- a/index.html
+++ b/index.html
@@ -256,5 +256,6 @@
           .prepend(document.querySelector(".theme-btn"));
       });
     </script>
+    <script src="https://www.unpkg.com/zod/lib/index.umd.js"></script>
   </body>
 </html>