Yes, you can upgrade the version of your phone to Android 4.4 KitKat. The update is delivered through OTA which means you have to manually check for updates while you are connected to a WiFi Network. Make sure that the battery is charged to 85 % or more to complete this procedure. After everything is set, go to Settings > About phone > Phone Update and search for updates. When it's found, accept it and start the update procedure. The phone might restart during this time.