diff --git a/mkdocs.yml b/mkdocs.yml
index e827a5d89..0314cdd8e 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -378,7 +378,6 @@ extra_javascript:
   - javascripts/mathjax.js
   - javascripts/plotly-instant.js
   - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
-  - https://polyfill.io/v3/polyfill.min.js?features=es6
 
 watch:
   - flixopt