diff --git a/socketio/__init__.py b/socketio/__init__.py
index 529f506..e9adb7f 100644
--- a/socketio/__init__.py
+++ b/socketio/__init__.py
@@ -27,7 +27,7 @@ else:  # pragma: no cover
     AsyncRedisManager = None
     AsyncAioPikaManager = None
 
-__version__ = '5.1.0'
+__version__ = '5.1.1dev'
 
 __all__ = ['__version__', 'Client', 'Server', 'BaseManager', 'PubSubManager',
            'KombuManager', 'RedisManager', 'ZmqManager', 'KafkaManager',