diff --git a/_includes/head.html b/_includes/head.html
index 649f064de67..61a6514273d 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -39,7 +39,7 @@
 
 {% if site.mathjax == true %}
 <!-- MathJax -->
-<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
 {% endif %}
 
 <!-- Icons -->