diff --git a/maro/__misc__.py b/maro/__misc__.py
index 8f33b5a9b..d647fe08c 100644
--- a/maro/__misc__.py
+++ b/maro/__misc__.py
@@ -2,6 +2,6 @@
 # Licensed under the MIT license.
 
 
-__version__ = "0.2.3a4"
+__version__ = "0.2.4a1"
 
 __data_version__ = "0.2"