diff --git a/CHANGES b/CHANGES
index 51f1ba858..8f2afc163 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+4.0.9 2018-03-14
+- Fix port occupied issue
+- Add xchacha20-ietf-poly1305
+- Update cryptographic libraries
+- Bug fixes and improvements
+
 4.0.8 2018-02-16
 - Add OpenSSL 1.1.0g support #1671
 - Update nuget packages
diff --git a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
index 60d50d12d..f9a7e0e04 100644
--- a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
+++ b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
@@ -24,7 +24,7 @@ public class UpdateChecker
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.0.8";
+        public const string Version = "4.0.9";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {