diff --git a/packages/frontend/src/index.html b/packages/frontend/src/index.html
index 4489f351f..b93e32265 100644
--- a/packages/frontend/src/index.html
+++ b/packages/frontend/src/index.html
@@ -19,7 +19,8 @@
 		content="default-src 'self';
 		  script-src 'self';
 		  style-src 'self' 'unsafe-inline';
-		  img-src 'self' data: www.google.com xn--931a.moe localhost:3000 localhost:5137 127.0.0.1:5173 127.0.0.1:3000"
+		  img-src 'self' data: www.google.com xn--931a.moe localhost:3000 localhost:5173 127.0.0.1:5173 127.0.0.1:3000;
+			media-src 'self' localhost:3000 localhost:5173 127.0.0.1:5173 127.0.0.1:3000;"
 	/>
 	<meta property="og:site_name" content="[DEV BUILD] Misskey" />
 </head>