diff --git a/CHANGELOG b/CHANGELOG
index ff2dc72..ac61a99 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+version 0.3.1 2018.09.07
+-update Chinese (Traditional) translation
+-include more files in MANIFEST.in
+
 version 0.3.0 2018.09.06
 -set mediabox correctly if page is rotated
 
diff --git a/pdfhandoutcrop/mainwindow.py b/pdfhandoutcrop/mainwindow.py
index 8a7355d..d392e20 100644
--- a/pdfhandoutcrop/mainwindow.py
+++ b/pdfhandoutcrop/mainwindow.py
@@ -52,7 +52,7 @@ def on_actionAbout_Qt_triggered(self):
 
     @pyqtSlot()
     def on_action_About_triggered(self):
-        version="0.3.0"
+        version="0.3.1"
         QMessageBox.about(self, self.tr("About"), self.tr(
 '''<h3>PdfHandoutCrop {0}</h3><br>
 Author: Hsiu-Ming Chang<br>
diff --git a/setup.py b/setup.py
index 512068d..d52c1ff 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 
 setup(
     name='pdfhandoutcrop',
-    version='0.3.0',
+    version='0.3.1',
     description='A tool to crop pdf handout with multiple pages per sheet',
     long_description=long_description,
     long_description_content_type='text/markdown',