diff --git a/package.json b/package.json
index a77c2e8..7ddb455 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "main": "app.js",
   "dependencies": {
-    "express": "2.5.x",
+    "express": "4.17.x",
     "socket.io": "0.9.x",
     "passport": ">= 0.0.0",
     "passport-yammer": "oscarrenalias/passport-yammer",