<!DOCTYPE html>
<html>

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>Geogeeks Learn JavaScript</title>
    
    <!------ CSS REFERENCES ------>    
    <link href="http://js.arcgis.com/3.11/esri/css/esri.css" rel="stylesheet"> <!-- esri.css -->
    <link href="css/main.css" rel="stylesheet"> <!-- main.css -->
    
	</head>

  <body>
    <div id="map"></div>
  
    <!------ JAVASCRIPT REFERENCES ------>
    <script src="http://js.arcgis.com/3.11/"></script><!-- esri.js -->
    <script src="js/main.js"></script><!-- main.css -->
  
  </body>
  
</html>

<!DOCTYPE html>
<html>

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title>Geogeeks Learn JavaScript</title>
    
    <!------ CSS REFERENCES ------>    
    <link href="http://js.arcgis.com/3.13/esri/css/esri.css" rel="stylesheet"> <!-- esri.css -->
    <link href="css/main.css" rel="stylesheet"> <!-- main.css -->
    
	</head>

  <body>
    <div id="map"></div>
  
    <!------ JAVASCRIPT REFERENCES ------>
    <script src="http://js.arcgis.com/3.13/"></script><!-- esri.js -->
    <script src="js/main.js"></script><!-- main.css -->
  
  </body>
  
</html>

Update to ArcGIS JavaScript v3.13
Update to ArcGIS JavaScript v3.13