diff --git a/_layouts/default.html b/_layouts/default.html
index e3cf9a5..287fec9 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -29,7 +29,7 @@
                 }
             });
         </script>
-        <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>
+        <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script>
         {% endif %}
         <link rel="stylesheet" href="/stylesheets/screen.css">
         <link rel="stylesheet" href="/stylesheets/friendly.css">