diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5fb1e3..1930351 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+Version 0.4
+-----------
+* bug fixed
+* minor update
+* update documentation
+
 Version 0.3
 -----------
 * add function `get_serialnumber` (return device serial number)
diff --git a/docs/conf.py b/docs/conf.py
index 774ab06..5072609 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -56,9 +56,9 @@ author = u'Fanani M. Ihsan'
 # built documents.
 #
 # The short X.Y version.
-version = u'0.3'
+version = u'0.4'
 # The full version, including alpha/beta/rc tags.
-release = u'0.3'
+release = u'0.4'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index db322d7..1e076b8 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@ from setuptools import setup
 
 setup(
     name='pyzk',
-    version='0.3',
+    version='0.4',
     description='an unofficial library of zksoftware the fingerprint attendance machine.',
     url='https://github.com/fananimi/pyzk',
     author='Fanani M. Ihsan',