diff --git a/moto/__init__.py b/moto/__init__.py
index cc127fbca..911630ba3 100644
--- a/moto/__init__.py
+++ b/moto/__init__.py
@@ -212,7 +212,7 @@ mock_all = MockAll
 # logging.getLogger('boto').setLevel(logging.CRITICAL)
 
 __title__ = "moto"
-__version__ = "3.1.19.dev"
+__version__ = "4.0.0.dev"
 
 
 try: