diff --git a/src/server/middleware.ts b/src/server/middleware.ts
index e10f5c41..432ab403 100644
--- a/src/server/middleware.ts
+++ b/src/server/middleware.ts
@@ -21,6 +21,7 @@ export function setDefaultCsp({
      style-src 'self' 'unsafe-inline';
      form-action 'self';
      base-uri 'self';
+     blob: 'self';
      frame-src *;
      media-src * data:`.replace(/\s+/g, " "),
   );