diff --git a/CHANGES b/CHANGES
index d48f5705..eeda7f45 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+4.0.2 2017-05-19
+- Fix legacy key derivation
+- Bug fixes and improvements
+
 4.0.1 2017-04-08
 - Fix UDP relay
 - Allow to add multiple servers via Shadowsocks URL
diff --git a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
index 367213be..4939baed 100644
--- a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
+++ b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
@@ -24,7 +24,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.0.1";
+        public const string Version = "4.0.2";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {