diff --git a/budoux/__init__.py b/budoux/__init__.py
index 289f6c07..60620c35 100644
--- a/budoux/__init__.py
+++ b/budoux/__init__.py
@@ -15,5 +15,7 @@
 
 from . import parser
 
+__version__ = "0.0.2"
+
 Parser = parser.Parser
 load_default_japanese_parser = parser.load_default_japanese_parser
diff --git a/budoux/main.py b/budoux/main.py
index 6a8b5677..04f8bbc0 100644
--- a/budoux/main.py
+++ b/budoux/main.py
@@ -25,8 +25,6 @@
 
 import budoux
 
-__version__ = "0.0.1"
-
 
 def check_file(path: str) -> str:
   """Check if filepath is exist or not.
@@ -98,7 +96,7 @@ def parse_args(
       "-V",
       "--version",
       action="version",
-      version="%(prog)s {}".format(__version__))
+      version="%(prog)s {}".format(budoux.__version__))
   if test:
     return parser.parse_args(test)
   else:
diff --git a/setup.cfg b/setup.cfg
index 725a312d..c131d26b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = budoux
-version = 0.0.2
+version = attr: budoux.__init__.__version__
 description = BudouX is the successor of Budou
 long_description = file: README.md
 long_description_content_type = text/markdown