diff --git a/src/aleph/sdk/client/authenticated_http.py b/src/aleph/sdk/client/authenticated_http.py
index da7f80f7..dda7de35 100644
--- a/src/aleph/sdk/client/authenticated_http.py
+++ b/src/aleph/sdk/client/authenticated_http.py
@@ -215,7 +215,7 @@ async def _broadcast_deprecated(self, message_dict: Mapping[str, Any]) -> None:
 
         async with self.http_session.post(
             url,
-            json={"topic": "ALEPH-TEST", "data": json.dumps(message_dict)},
+            json={"topic": "ALEPH-TEST", "data": json.dumps(message_dict, default=extended_json_encoder)},
         ) as response:
             await self._handle_broadcast_deprecated_response(response)
 
@@ -678,7 +678,7 @@ async def _storage_push_file_with_message(
             "sync": sync,
         }
         data.add_field(
-            "metadata", json.dumps(metadata), content_type="application/json"
+            "metadata", json.dumps(metadata, default=extended_json_encoder), content_type="application/json"
         )
         # Add the file
         data.add_field("file", file_content)