diff --git a/app/core/content/utils.py b/app/core/content/utils.py
index 8f3fed3..3cc89e8 100644
--- a/app/core/content/utils.py
+++ b/app/core/content/utils.py
@@ -49,7 +49,7 @@ async def create_metadata_for_item(
     async with AsyncClient() as client:
         response = await client.post(
             f"{PROJECT_HOST}/api/v1/storage",
-            files={"file": ('metadata.json', metadata_bin, 'application/json')},
+            files={"file": ('metadata.json', metadata_bin, 'json')},
             headers={
                 'X-Service-Signature': signer.sign(metadata_hash),
                 'X-Message-Hash': metadata_hash_b58,