diff --git a/CHANGES b/CHANGES
index cec7029..fa94326 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,10 @@
+3.4.0 (pre-release) 2016-12-9
+- Replace Privoxy with built-in http proxy.
+- Try fix system proxy settings on windows 10 insider preview.
+- Secure local pac.
+- Update bypass list.
+- Bug fixes and improvements.
+
 3.3.6 2016-12-6
 - Refine system proxy mode switching logic,
   merge 'Switch to PAC' and 'Switch to Global' into
diff --git a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
index 92507dd..55e260f 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 = "3.3.6";
+        public const string Version = "3.4.0";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {