diff --git a/package.json b/package.json
index 1d1a5ced..26348e42 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "webpack-dev-server": "1.11.0"
   },
   "dependencies": {
-    "exenv": "1.2.0",
+    "exenv": "^1.2.0",
     "prop-types": "^15.5.10",
     "react-dom-factories": "^1.0.0"
   },