diff --git a/js/chess.js b/js/chess.js
index 86cb568..777f547 100644
--- a/js/chess.js
+++ b/js/chess.js
@@ -821,6 +821,9 @@ $(function (){
          switchGameId(gameId);
       }
    };
+
+   /* force page reload after four hours to keep client code up to date */
+   window.setTimeout(function(){ location.reload(); }, 4*3600*1000);
 });
 
 /* vim:set expandtab sw=3 ts=8: */