diff --git a/atrcopy/__init__.py b/atrcopy/__init__.py
index 5ea50bd..c506de7 100755
--- a/atrcopy/__init__.py
+++ b/atrcopy/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.3.3"
+__version__ = "2.4.0"
 
 try:
     import numpy as np