diff --git a/examples/client_auth/package.json b/examples/client_auth/package.json
index 804d764..4291481 100644
--- a/examples/client_auth/package.json
+++ b/examples/client_auth/package.json
@@ -10,7 +10,7 @@
     "cookie-parser": "~1.3.3",
     "debug": "~2.0.0",
     "ejs": "~0.8.5",
-    "express": "~4.9.0",
+    "express": "~4.17.1",
     "morgan": "~1.3.0",
     "serve-favicon": "~2.1.3",
     "underscore": "^1.7.0"