diff --git a/parsons/action_network/action_network.py b/parsons/action_network/action_network.py
index 07d528fbfb..db24a05cf4 100644
--- a/parsons/action_network/action_network.py
+++ b/parsons/action_network/action_network.py
@@ -925,7 +925,7 @@ def update_message(self, message_id, payload):
         `Documentation Reference`:
             https://actionnetwork.org/docs/v2/messages
         """
-        return self.api.put_request(f"messages/{message_id}", payload)
+        return self.api.put_request(f"messages/{message_id}", json=payload)
 
     # Metadata
     def get_metadata(self):