diff --git a/package.json b/package.json
index f6b513b..3e203e1 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "devDependencies": {
     "chai": "~1.8.1",
-    "express": "~3.4.7",
+    "express": "~4.17.1",
     "grunt": "~0.4.2",
     "grunt-cli": "~0.1.11",
     "grunt-contrib-jshint": "~0.7.2",