diff --git a/package.json b/package.json
index 200c80fe..10ccb37b 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "source-map": "^0.1.34"
   },
   "devDependencies": {
-    "express": "~3.4.4",
+    "express": "~4.17.1",
     "grunt": "^0.4.5",
     "grunt-build-control": "^0.1.3",
     "grunt-contrib-concat": "~0.3.0",