diff --git a/_layouts/default.html b/_layouts/default.html
index f7ad215..ed7547f 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -22,7 +22,7 @@
     });
   </script>
 
-  <script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML" type="text/javascript"></script>
+  <script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML" type="text/javascript"></script>
 
   <a class="skip-to-main" href="#main-content">Skip to main content</a>
   {% include icons/icons.html %}
@@ -62,4 +62,4 @@
   {% endif %}
 </body>
 </html>
-    
\ No newline at end of file
+