Update server/openspiel_environment.py

server/openspiel_environment.py

@@ -65,7 +65,9 @@ class OpenSpielEnvironment(Environment):
         >>> obs = env.step(OpenSpielAction(action_id=1))
         >>> print(obs.reward)
     """
-
+    
+    SUPPORTS_CONCURRENT_SESSIONS: bool = True
+    
     def __init__(
         self,
         game_name: str = "catch",