diff --git a/package.json b/package.json
index fbf2d46..7305f95 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
     "version": "1.0.0",
     "author": "",
     "dependencies": {
-        "express": ">=3.0",
+        "express": ">=3.0 <= 4.0",
         "underscore": "",
         "uglify-js": "=2.2.5",
         "ws": ">=0.4",