diff --git a/CHANGES.rst b/CHANGES.rst
index 4fc8f3b..59330b4 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,8 +1,8 @@
 Changes
 =======
 
-0.4.0 (unreleased)
------------------------
+0.4.0 (2019-03-19)
+------------------
 
 - Modernize development environment.
 - encoder / decoder
diff --git a/src/hypua2jamo/__init__.py b/src/hypua2jamo/__init__.py
index 6c6ef20..fff74a9 100644
--- a/src/hypua2jamo/__init__.py
+++ b/src/hypua2jamo/__init__.py
@@ -20,7 +20,7 @@
 import logging
 
 
-__version__ = '0.4.0.dev0'
+__version__ = '0.4.0'
 
 
 logger = logging.getLogger(__name__)