diff --git a/README.md b/README.md
index 67d1c38bd8..7dd5bab2d2 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ For additional features
 Environments under Python 2.7.12 and 3.6.0 are tested.
 
 The HEAD of the master branch is developed for Chainer v2.
-For users using Chainer v1, please use version 0.4.10, which can be installed by `pip install chainercv==0.4.10`.
+For users using Chainer v1, please use version 0.4.11, which can be installed by `pip install chainercv==0.4.10`.
 
 
 # Features
diff --git a/setup.py b/setup.py
index a99b28dd8b..aceb1f0fbd 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
 
 setup(
     name='chainercv',
-    version='0.5.0',
+    version='0.5.1',
     packages=find_packages(),
     author='Yusuke Niitani',
     author_email='yuyuniitani@gmail.com',