diff --git a/web-server/v0.3/demo.html b/web-server/v0.3/demo.html
index c043930bae..0fbcef7c48 100644
--- a/web-server/v0.3/demo.html
+++ b/web-server/v0.3/demo.html
@@ -4,8 +4,8 @@
 <link rel="stylesheet" href="css/jschart.css"/>
 </head>
 <body>
-<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
-<script src="http://d3js.org/d3-queue.v3.min.js" charset="utf-8"></script>
+<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
+<script src="https://d3js.org/d3-queue.v3.min.js" charset="utf-8"></script>
 <script src="js/jschart.js" charset="utf-8"></script>
 <script src="other.js/saveSvgAsPng.js" charset="utf-8"></script>
 <div id='jschart_histogram'>
