diff --git a/cards/synthesis/index.html b/cards/synthesis/index.html
index 99d7c0c..2380bc5 100644
--- a/cards/synthesis/index.html
+++ b/cards/synthesis/index.html
@@ -4,7 +4,7 @@
 	<title>http micro tempo</title>	
     <script src="https://code.jquery.com/jquery-1.8.2.js"></script>
     <script src="https://jquery-csv.googlecode.com/git/src/jquery.csv.js"></script>	
-    <script src="https://raw.githubusercontent.com/mbostock/d3/master/d3.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
     <script src="lib/ssss.js"></script>	<!-- data -->
     <script src="lib/yyyy.js"></script>	<!-- audio -->
     <script src="lib/nnnn.js"></script> <!-- svg -->