diff --git a/bioblend/galaxyclient.py b/bioblend/galaxyclient.py
index 25ebb6166..bbd179373 100644
--- a/bioblend/galaxyclient.py
+++ b/bioblend/galaxyclient.py
@@ -255,7 +255,7 @@ def make_put_request(self, url: str, payload: Optional[dict] = None, params: Opt
                     status_code=r.status_code,
                 )
         elif r.status_code == 204:
-            return {}
+            return None
         # @see self.body for HTTP response body
         raise ConnectionError(
             f"Unexpected HTTP status code: {r.status_code}",