diff --git a/package.json b/package.json
index 7ad17b5..622e412 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/lukechilds/browser-env#readme",
   "dependencies": {
-    "window": "3.1.5"
+    "window": "4.0.1"
   },
   "devDependencies": {
     "ava": "^0.20.0",