diff --git a/index.html b/index.html
index 0fcff2ec..63ef9f71 100644
--- a/index.html
+++ b/index.html
@@ -16,5 +16,6 @@
 
     <div id="root"></div>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.10.0/d3.js"></script>
+    <script src="//d3js.org/d3-scale-chromatic.v0.3.min.js"></script>
   </body>
 </html>