diff --git a/vercel.json b/vercel.json
index 2b2e0ce4300296ffcc7cc913afc5061b7e7133dc..2f4c40cccf9ff76f6e5bbf54e74346992d21cccd 100644
--- a/vercel.json
+++ b/vercel.json
@@ -130,7 +130,7 @@
       "headers": [
         {
           "key": "content-type",
-          "value": "application/json"
+          "value": "application/activity+json"
         }
       ]
     },