diff --git a/impy/__init__.py b/impy/__init__.py
index 5a0ff50..4f994ed 100644
--- a/impy/__init__.py
+++ b/impy/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "2.4.1"
+__version__ = "2.4.2"
 __author__ = "Hanjin Liu"
 __email__ = "liuhanjin-sc@g.ecc.u-tokyo.ac.jp"