diff --git a/chatexchange_extension.py b/chatexchange_extension.py
index 6b6a7bfaa4..3a097296fd 100644
--- a/chatexchange_extension.py
+++ b/chatexchange_extension.py
@@ -1,16 +1,16 @@
 # coding=utf-8
 from chatexchange import client, events, rooms
 import sys
-from datetime import datetime
+from datetime import datetime, timezone
 from helpers import log
 
 
 class Room(rooms.Room):
     def watch_socket(self, event_callback):
-        self._client.last_activity = datetime.now(datetime.UTC)
+        self._client.last_activity = datetime.now(tz=timezone.utc)
 
         def on_activity(activity):
-            self._client.last_activity = datetime.now(datetime.UTC)
+            self._client.last_activity = datetime.now(tz=timezone.utc)
 
             for event in self._events_from_activity(activity, self.id):
                 if isinstance(event, events.MessageEdited):