diff --git a/async_timeout/__init__.py b/async_timeout/__init__.py
index <HASH>..<HASH> 100644
--- a/async_timeout/__init__.py
+++ b/async_timeout/__init__.py
@@ -8,7 +8,7 @@ from typing import Any, Optional, Type
 from typing_extensions import final
 
 
-__version__ = "4.0.0a0"
+__version__ = "4.0.0a1"
 
 
 __all__ = ("timeout", "timeout_at")
Bump to <I>a1