diff --git a/package.json b/package.json
index bf0ee06..fc28f02 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
     "react-dom": "^15.4.2"
   },
   "devDependencies": {
+    "prop-types": "^15.6.2",
     "babel-core": "^6.23.1",
     "babel-loader": "^6.3.2",
     "babel-polyfill": "^6.23.0",