diff --git a/History.md b/History.md
index 0af948c..077a135 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,11 @@
+0.5.0 / 2015-05-02
+==================
+
+* bump `engine.io-client`.
+* enhance parser decode [niqo01]
+* add a wrong event name check
+* add setDefaultHostnameVerifier method
+
 0.4.2 / 2015-03-07
 ==================
 
diff --git a/README.md b/README.md
index 496d6c3..8153685 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Add the following dependency to your `pom.xml`.
   <dependency>
     <groupId>com.github.nkzawa</groupId>
     <artifactId>socket.io-client</artifactId>
-    <version>0.4.2</version>
+    <version>0.5.0</version>
   </dependency>
 </dependencies>
 ```
@@ -28,7 +28,7 @@ Add the following dependency to your `pom.xml`.
 Add it as a gradle dependency for Android Studio, in `build.gradle`:
 
 ```groovy
-compile 'com.github.nkzawa:socket.io-client:0.4.2'
+compile 'com.github.nkzawa:socket.io-client:0.5.0'
 ```
 
 ## Usage
diff --git a/pom.xml b/pom.xml
index bc97d7e..ea41f1a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.github.nkzawa</groupId>
   <artifactId>socket.io-client</artifactId>
-  <version>0.4.3-SNAPSHOT</version>
+  <version>0.5.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>socket.io-client</name>
   <description>Socket.IO Client Library for Java</description>