diff --git a/python_graphql_client/graphql_client.py b/python_graphql_client/graphql_client.py
index 1d3d104..4ecce25 100644
--- a/python_graphql_client/graphql_client.py
+++ b/python_graphql_client/graphql_client.py
@@ -82,6 +82,7 @@ async def subscribe(
         operation_name: str = None,
         headers: dict = {},
         init_payload: dict = {},
+        ws_subprotocol: str = "graphql-ws",
     ):
         """Make asynchronous request for GraphQL subscription."""
         connection_init_message = json.dumps(
@@ -91,13 +92,19 @@ async def subscribe(
         request_body = self.__request_body(
             query=query, variables=variables, operation_name=operation_name
         )
-        request_message = json.dumps(
-            {"type": "start", "id": "1", "payload": request_body}
-        )
+
+        if ws_subprotocol == "graphql-ws":
+            protocol_specific_request = {"type": "start", "id": "1", "payload": request_body}
+        elif ws_subprotocol == "graphql-transport-ws":
+            protocol_specific_request = {"type": "subscribe", "id": "1", "payload": request_body}
+        else:
+          raise ValueError(f"Unknown subprotocol {ws_subprotocol}")
+
+        request_message = json.dumps(protocol_specific_request)
 
         async with websockets.connect(
             self.endpoint,
-            subprotocols=["graphql-ws"],
+            subprotocols=[ws_subprotocol],
             extra_headers={**self.headers, **headers},
         ) as websocket:
             await websocket.send(connection_init_message)