diff --git a/pyproject.toml b/pyproject.toml
index 54632b7..94a7505 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "launch-generator"
-version = "0.3.0"
+version = "0.4.0"
 description = "Simple launch file generator for ROS2."
 authors = [
     { name = "Tatsuro Sakaguchi", email = "tatsuro.sakaguchi@g.softbank.co.jp" },
diff --git a/setup.py b/setup.py
index acb80da..99cc2b2 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,7 @@
 
 setuptools.setup(
     name='launch_generator',
-    version='0.3.0',
+    version='0.4.0',
     author='Tatsuro Sakaguchi',
     author_email='tatsuro.sakaguchi@g.softbank.co.jp',
     description='The package `launch-generator` is a tool to easily generate launch descriptions for ROS 2.',