diff --git a/index.html b/index.html
index a4c3b2a..35fdacd 100644
--- a/index.html
+++ b/index.html
@@ -1,8 +1,8 @@
 <html>
 <head>
   <meta charset="UTF-8">
-  <script language="javascript" type="text/javascript" src="http://p5js.org/js/p5.min.js"></script>
-  <script src="http://peterolson.github.com/BigInteger.js/BigInteger.min.js"></script>
+  <script language="javascript" type="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.20/p5.min.js"></script>
+  <script src="https://peterolson.github.io/BigInteger.js/BigInteger.min.js"></script>
   <script language="javascript" type="text/javascript" src="sketch.js"></script>
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
   <script language="javascript" type="text/javascript" src="selecting_neighbors.js"></script>
@@ -36,4 +36,4 @@
     	<p>Click cells to include in neighborhood</p>
     </div>
 </body>
-</html>
\ No newline at end of file
+</html>
