diff --git a/setup.py b/setup.py
index b5d1b4b..40dbce1 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@ def build_extension(self, ext):
 
 setup(
     name="pySequentialLineSearch",
-    version="0.3",
+    version="0.4",
     author="Yuki Koyama",
     author_email="yuki@koyama.xyz",
     description="Python bindings of sequential line search",