diff --git a/apps/www/app/glossary/sitemap.ts b/apps/www/app/glossary/sitemap.ts
index 3d79ab9f80..6c4e06859c 100644
--- a/apps/www/app/glossary/sitemap.ts
+++ b/apps/www/app/glossary/sitemap.ts
@@ -1,6 +1,4 @@
-import fs from "node:fs/promises";
-import path from "node:path";
-
+import { allGlossaries } from "@/.content-collections/generated";
 import { env } from "@/lib/env";
 import type { MetadataRoute } from "next";
 
@@ -8,15 +6,9 @@ export const dynamic = "force-dynamic";
 export const revalidate = 0;
 
 export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
-  // NB: I initally tried to import allGlossaries from content-collections but it wasn't available
-  const glossaryDir = path.join(process.cwd(), "content", "glossary");
-  const files = await fs.readdir(glossaryDir);
-
   // NB: Google's limit is 50,000 URLs per sitemap, split up if necessary: https://nextjs.org/docs/app/api-reference/functions/generate-sitemaps
-  return files
-    .filter((file) => file.endsWith(".mdx"))
-    .map((file) => ({
-      url: `${env().NEXT_PUBLIC_BASE_URL}/glossary/${path.basename(file, ".mdx")}`,
-      lastModified: new Date(), // TODO: Get the actual last modified date of the file -- if content-collections doesn't work from marketing-db?
-    }));
+  return allGlossaries.map((entry) => ({
+    url: `${env().NEXT_PUBLIC_BASE_URL}/glossary/${entry.slug}`,
+    lastModified: entry.updatedAt,
+  }));
 }