diff --git a/spec/_layouts/default.yml b/spec/_layouts/default.yml
index d41d045311a3..61085b5a3e78 100644
--- a/spec/_layouts/default.yml
+++ b/spec/_layouts/default.yml
@@ -15,7 +15,7 @@
     }
   });
   </script>
-  <script type="text/javascript" src="//cdn.mathjax.org/mathjax/2.3-latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+  <script type="text/javascript" src="//cdn.mathjax.org/mathjax/2.6-latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
   <script src="//code.jquery.com/jquery-2.1.3.min.js"></script>
   <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/8.2/styles/default.min.css">
   <!-- need to use include to see value of page.chapter variable -->