diff --git a/presentations/immutability/plugin/multiplex/package.json b/presentations/immutability/plugin/multiplex/package.json
index 1d0e429..6327239 100644
--- a/presentations/immutability/plugin/multiplex/package.json
+++ b/presentations/immutability/plugin/multiplex/package.json
@@ -10,7 +10,7 @@
     "node": "~4.1.1"
   },
   "dependencies": {
-    "express": "~4.16.0",
+    "express": "~4.17.1",
     "grunt-cli": "~1.3.0",
     "mustache": "~2.2.1",
     "socket.io": "~2.0.0"