diff --git a/package.json b/package.json
index 996d6b3..0fad1d1 100644
--- a/package.json
+++ b/package.json
@@ -146,7 +146,7 @@
     "webpack-dev-server": "2.9.1",
     "webpack-md5-hash": "0.0.5",
     "webpack-merge": "4.1.0",
-    "zone.js": "0.8.18"
+    "zone.js": "^0.8.4"
   },
   "release": {
     "branch": "master",