diff --git a/pygmtools/__init__.py b/pygmtools/__init__.py
index c899b26..2aa149b 100644
--- a/pygmtools/__init__.py
+++ b/pygmtools/__init__.py
@@ -18,7 +18,7 @@
 set_backend = utils.set_backend
 
 BACKEND = 'numpy'
-__version__ = '0.5.1'
+__version__ = '0.5.2'
 __author__ = 'ThinkLab at SJTU'
 
 SUPPORTED_BACKENDS = [