diff --git a/mkdocs.yml b/mkdocs.yml
index 550d3e7d5..16091cb89 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -86,7 +86,6 @@ extra_css:
   - "stylesheets/ft.extra.css"
 extra_javascript:
   - javascripts/config.js
-  - https://polyfill.io/v3/polyfill.min.js?features=es6
   - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
 markdown_extensions:
   - attr_list