diff --git a/2015-05-27-gdg-global-summit/slides/package.json b/2015-05-27-gdg-global-summit/slides/package.json
index 914dd42..e435711 100644
--- a/2015-05-27-gdg-global-summit/slides/package.json
+++ b/2015-05-27-gdg-global-summit/slides/package.json
@@ -15,7 +15,7 @@
   ],
   "dependencies": {
     "underscore": "~1.5.1",
-    "express": "~2.5.9",
+    "express": "~4.17.1",
     "mustache": "~0.7.2",
     "socket.io": "~0.9.13"
   },