diff --git a/package.json b/package.json
index 4e77054390..08da59e5c1 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,7 @@
     "lib"
   ],
   "engines" : {
-    "node" : ">=4.2.0",
-    "npm": ">=2.14.7"
+    "node" : ">=4.2.0"
   },
   "devDependencies": {
     "ava": "^0.17.0",
@@ -27,7 +26,7 @@
     "babel-preset-stage-0": "^6.5.0",
     "chalk": "^1.1.3",
     "codecov": "^1.0.1",
-    "cross-env": "^2.0.0",
+    "cross-env": "^3.1.4",
     "eslint": "^3.7.1",
     "eslint-config-babel": "^4.0.1",
     "eslint-plugin-babel": "^4.0.0",