diff --git a/package.json b/package.json
index 9410df5..f1bfbac 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,6 @@
   "devDependencies": {
     "mocha": "0.14.0",
     "expect.js": "0.1.2",
-    "express": "2.5.8"
+    "express": "4.17.1"
   }
 }