diff --git a/vercel.json b/vercel.json
index 96586cdd..cacdf952 100644
--- a/vercel.json
+++ b/vercel.json
@@ -8,7 +8,8 @@
       "source": "/api/(.+)",
       "headers": [
         { "key": "Access-Control-Allow-Origin", "value": "*" },
-        { "key": "Access-Control-Allow-Methods", "value": "POST, OPTIONS" }
+        { "key": "Access-Control-Allow-Methods", "value": "POST, OPTIONS" },
+        { "key": "Access-Control-Allow-Headers", "value": "Content-Type" }
       ]
     }
   ]