diff --git a/pkgs/utils/prod-index.ts b/pkgs/utils/prod-index.ts
index 72c07f5..5204896 100644
--- a/pkgs/utils/prod-index.ts
+++ b/pkgs/utils/prod-index.ts
@@ -20,6 +20,7 @@ export const prodIndex = (
     content="width=device-width, initial-scale=1.0, user-scalable=1.0, minimum-scale=1.0, maximum-scale=1.0">
   <link rel="stylesheet" href="/index.css">
   <link rel="stylesheet" href="/main.css">
+  <meta http-equiv="Content-Security-Policy" content="default-src 'self';" />
 ${this.head.join("\n")}
 </head>