diff --git a/appengine/metadata/package.json b/appengine/metadata/package.json
index ac9745196b..22de5d829c 100644
--- a/appengine/metadata/package.json
+++ b/appengine/metadata/package.json
@@ -20,7 +20,7 @@
     "e2e-test": "samples test deploy"
   },
   "dependencies": {
-    "express": "4.15.4",
+    "express": "4.21.0",
     "got": "7.1.0"
   },
   "devDependencies": {