diff --git a/public/index.html b/public/index.html
index dd7be50..41e750a 100644
--- a/public/index.html
+++ b/public/index.html
@@ -6,7 +6,7 @@
 	<body>
 		<h1>Run Tracker</h1>
 		<svg></svg>
-		<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
+		<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
 		<script src="/js/app.js"></script>
 	</body>
 </html>
