diff --git a/pyscript.core/test/ui/gallery.html b/pyscript.core/test/ui/gallery.html
index 2e54f310..d4af2c14 100644
--- a/pyscript.core/test/ui/gallery.html
+++ b/pyscript.core/test/ui/gallery.html
@@ -8,6 +8,8 @@
         <link rel="stylesheet" href="../../dist/core.css">
         <script type="module" src="../../dist/core.js"></script>
 
+        <script src="https://cdn.jsdelivr.net/npm/marked@11.1.1/lib/marked.umd.min.js"></script>
+
         <style>
             body {
                 font-family: -apple-system, "system-ui", "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"