diff --git a/atrcopy/__init__.py b/atrcopy/__init__.py
index 1d3545c..79db365 100644
--- a/atrcopy/__init__.py
+++ b/atrcopy/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.5.0"
+__version__ = "2.5.1"
 
 try:
     import numpy as np