diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 17cd6c3..83bc45b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,22 @@
 Change log
 ================================================================================
 
+
+0.5.0 - 30.08.2017
+--------------------------------------------------------------------------------
+
+Updated
+********************************************************************************
+
+#. put dependency on pyexcel-io 0.5.0, which uses cStringIO instead of StringIO.
+   Hence, there will be performance boost in handling files in memory.
+
+Relocated
+--------------------------------------------------------------------------------
+
+#. All ods type conversion code lives in pyexcel_io.service module
+
+
 0.4.1 - 25.08.2017
 --------------------------------------------------------------------------------
 
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 4423ccb..3836c77 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -20,8 +20,8 @@
 
 project = u'pyexcel-ods'
 copyright = u'2015-2017 Onni Software Ltd.'
-version = '0.4.1'
-release = '0.4.1'
+version = '0.5.0'
+release = '0.5.0'
 exclude_patterns = []
 pygments_style = 'sphinx'
 html_theme = 'default'
diff --git a/pyexcel_ods.yaml b/pyexcel_ods.yaml
index bdefd5b..c72ed07 100644
--- a/pyexcel_ods.yaml
+++ b/pyexcel_ods.yaml
@@ -1,11 +1,11 @@
 overrides: "pyexcel.yaml"
 name: "pyexcel-ods"
 nick_name: ods
-version: 0.4.1
-current_version: 0.4.1
-release: 0.4.1
+version: 0.5.0
+current_version: 0.5.0
+release: 0.5.0
 file_type: ods
 dependencies:
-  - pyexcel-io>=0.4.0
+  - pyexcel-io>=0.5.0
   - odfpy>=1.3.3
 description: A wrapper library to read, manipulate and write data in ods format
diff --git a/requirements.txt b/requirements.txt
index bbd7824..9ffd1b6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-pyexcel-io>=0.4.0
+pyexcel-io>=0.5.0
 odfpy>=1.3.3
diff --git a/rnd_requirements.txt b/rnd_requirements.txt
index 3d8132d..2ce1c92 100644
--- a/rnd_requirements.txt
+++ b/rnd_requirements.txt
@@ -1,4 +1,2 @@
-https://github.com/chfw/lml/archive/master.zip
-https://github.com/pyexcel/pyexcel-io/archive/dev.zip
 https://github.com/pyexcel/pyexcel/archive/master.zip
-https://github.com/pyexcel/pyexcel-xls/archive/dev.zip
+
diff --git a/setup.py b/setup.py
index e97928e..513c5c7 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 NAME = 'pyexcel-ods'
 AUTHOR = 'C.W.'
-VERSION = '0.4.1'
+VERSION = '0.5.0'
 EMAIL = 'wangc_2011@hotmail.com'
 LICENSE = 'New BSD'
 DESCRIPTION = (
@@ -15,7 +15,7 @@
     ''
 )
 URL = 'https://github.com/pyexcel/pyexcel-ods'
-DOWNLOAD_URL = '%s/archive/0.4.1.tar.gz' % URL
+DOWNLOAD_URL = '%s/archive/0.5.0.tar.gz' % URL
 FILES = ['README.rst', 'CHANGELOG.rst']
 KEYWORDS = [
     'python'
@@ -36,7 +36,7 @@
 ]
 
 INSTALL_REQUIRES = [
-    'pyexcel-io>=0.4.0',
+    'pyexcel-io>=0.5.0',
     'odfpy>=1.3.3',
 ]