diff --git a/cozepy/websockets/chat/__init__.py b/cozepy/websockets/chat/__init__.py
index a76508a..6507de8 100644
--- a/cozepy/websockets/chat/__init__.py
+++ b/cozepy/websockets/chat/__init__.py
@@ -181,8 +181,8 @@ def __init__(
         auth: Auth,
         requester: Requester,
         bot_id: str,
-        workflow_id: str,
         on_event: Union[WebsocketsChatEventHandler, Dict[WebsocketsEventType, Callable]],
+        workflow_id: Optional[str] = None,
         **kwargs,
     ):
         if isinstance(on_event, WebsocketsChatEventHandler):
@@ -352,8 +352,8 @@ def create(
         self,
         *,
         bot_id: str,
-        workflow_id: str,
         on_event: Union[WebsocketsChatEventHandler, Dict[WebsocketsEventType, Callable]],
+        workflow_id: Optional[str] = None,
         **kwargs,
     ) -> WebsocketsChatClient:
         return WebsocketsChatClient(
@@ -361,8 +361,8 @@ def create(
             auth=self._auth,
             requester=self._requester,
             bot_id=bot_id,
-            workflow_id=workflow_id,
             on_event=on_event,  # type: ignore
+            workflow_id=workflow_id,
             **kwargs,
         )
 
@@ -433,8 +433,8 @@ def __init__(
         auth: Auth,
         requester: Requester,
         bot_id: str,
-        workflow_id: str,
         on_event: Union[AsyncWebsocketsChatEventHandler, Dict[WebsocketsEventType, Callable]],
+        workflow_id: Optional[str] = None,
         **kwargs,
     ):
         if isinstance(on_event, AsyncWebsocketsChatEventHandler):
@@ -604,8 +604,8 @@ def create(
         self,
         *,
         bot_id: str,
-        workflow_id: str,
         on_event: Union[AsyncWebsocketsChatEventHandler, Dict[WebsocketsEventType, Callable]],
+        workflow_id: Optional[str] = None,
         **kwargs,
     ) -> AsyncWebsocketsChatClient:
         return AsyncWebsocketsChatClient(
@@ -613,7 +613,7 @@ def create(
             auth=self._auth,
             requester=self._requester,
             bot_id=bot_id,
-            workflow_id=workflow_id,
             on_event=on_event,  # type: ignore
+            workflow_id=workflow_id,
             **kwargs,
         )