diff --git a/lib/default-options.js b/lib/default-options.js
index b5c6b13..db71828 100644
--- a/lib/default-options.js
+++ b/lib/default-options.js
@@ -2,7 +2,7 @@
 module.exports = {
   assetMapPath: '',
   exclude: [],
-  extensions: ['js', 'css', 'png', 'jpg', 'gif', 'map'],
+  extensions: ['js', 'css', 'png', 'jpg', 'gif', 'svg', 'webp', 'map', 'mp4', 'webmanifest', 'json'],
   fingerprintAssetMap: false,
   prepend: '',
   railsManifestPath: '',