diff --git a/zensical.toml b/zensical.toml
index e9bd088..9762644 100644
--- a/zensical.toml
+++ b/zensical.toml
@@ -164,7 +164,11 @@ extra_css = ["stylesheets/mermaid-override.css"]
 # The path provided should be relative to the "docs_dir".
 #
 # Read more: https://zensical.org/docs/customization/#additional-javascript
-extra_javascript = ["javascripts/mermaid-override.js", "javascripts/mathjax.js"]
+extra_javascript = [
+  "javascripts/mermaid-override.js",
+  "javascripts/mathjax.js",
+  "https://unpkg.com/mathjax@3/es5/tex-mml-chtml.js",
+]
 
 # ----------------------------------------------------------------------------
 # Section for configuring theme options