diff --git a/websocket-sharp/Net/ServerSslConfiguration.cs b/websocket-sharp/Net/ServerSslConfiguration.cs
index 4566e2f9..47541f43 100644
--- a/websocket-sharp/Net/ServerSslConfiguration.cs
+++ b/websocket-sharp/Net/ServerSslConfiguration.cs
@@ -5,7 +5,7 @@
  * The MIT License
  *
  * Copyright (c) 2014 liryna
- * Copyright (c) 2014-2017 sta.blockhead
+ * Copyright (c) 2014-2020 sta.blockhead
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal