diff --git a/visualization/index.html b/visualization/index.html
index 8631d11..d8c7df7 100644
--- a/visualization/index.html
+++ b/visualization/index.html
@@ -4,8 +4,8 @@
     <meta charset="utf-8"/>
     <title>Revenge of the Cyclic Cicadas</title>
     <link rel="stylesheet" href="index.css"/>
-    <script src="preprocessed.js"></script>
-    <script defer="" src="index.js"></script>
+    <script type="module" src="preprocessed.js"></script>
+    <script type="module" src="index.js"></script>
   </head>
   <body>
     <div id="sidebar">
