diff --git a/package.json b/package.json
index 2bce82cc..021174fb 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
   "dependencies": {
     "arrify": "^1.0.0",
     "babel-eslint": "^4.1.1",
-    "deep-assign": "^2.0.0",
+    "deep-assign": "^1.0.0",
     "eslint": "^1.7.3",
     "eslint-config-xo": "^0.7.0",
     "eslint-plugin-babel": "^2.1.1",