diff --git a/drift/conversations.py b/drift/conversations.py
index f2014b6..5970dc8 100644
--- a/drift/conversations.py
+++ b/drift/conversations.py
@@ -64,5 +64,5 @@ def _normalize_message_keys(self, **kwargs):
 
         Note: Also drops unknown keys.
         """
-        allowed_keys = ['edited_message_id', 'edit_type', 'body', 'buttons']
+        allowed_keys = ['edited_message_id', 'edit_type', 'body', 'buttons', 'userId']
         return normalize_keys(allowed_keys, kwargs)