diff --git a/index.html b/index.html
old mode 100755
new mode 100644
index ab54458..38bc675
--- a/index.html
+++ b/index.html
@@ -106,7 +106,7 @@ <h2>Comparing 2011 vs. 2005</h2>
 
 
 <script type="text/javascript" src="https://d3js.org/d3.v4.min.js"></script>
-<script type="text/javascript" src="https://npmcdn.com/d3-tip@0.6.7/index.js"></script>
+<script type="text/javascript" src="https://unpkg.com/d3-tip@0.6.7/index.js"></script>
 <script type="text/javascript" src="script.js"></script>
 </body>
 </html>