diff --git a/package.json b/package.json
index bb57d01..be30e87 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
     "brfs": "^1.4.0",
     "earcut": "^2.0.1",
     "eventemitter3": "^1.1.1",
-    "object-assign": "^3.0.0",
+    "object-assign": "^2.0.0",
     "resource-loader": "^1.6.1"
   },
   "devDependencies": {