diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index acacf977..4d7b6525 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -50,7 +50,6 @@ markdown_extensions:
       permalink: true
 extra_javascript:
   - javascripts/mathjax.js
-  - https://polyfill.io/v3/polyfill.min.js?features=es6
   - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js