diff --git a/mkdocs.yml b/mkdocs.yml
index 9e484e5..1b5bee3 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -92,7 +92,7 @@ markdown_extensions:
   - mdx_math
 
 extra_javascript:
-  - 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML'
+  - 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/?config=TeX-AMS_HTML'
 
 extra_css:
   - css/style.css