diff --git a/flask_socketio/__init__.py b/flask_socketio/__init__.py
index b1fd38a2..c397aa5b 100644
--- a/flask_socketio/__init__.py
+++ b/flask_socketio/__init__.py
@@ -26,7 +26,7 @@
 from .namespace import Namespace
 from .test_client import SocketIOTestClient
 
-__version__ = '4.1.0'
+__version__ = '4.1.1dev'
 
 
 class _SocketIOMiddleware(socketio.WSGIApp):