diff --git a/aiorwlock/__init__.py b/aiorwlock/__init__.py
index c85921c..8aed815 100644
--- a/aiorwlock/__init__.py
+++ b/aiorwlock/__init__.py
@@ -3,7 +3,7 @@
 from collections import deque
 from typing import Any, Deque, List, Tuple
 
-__version__ = "1.4.0"
+__version__ = "1.5.0a0"
 __all__ = ('RWLock',)