diff --git a/package.json b/package.json
index 7002e527f2..78e06c3d14 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
   "dependencies": {
     "classnames": "^2.2.4",
     "create-react-class": "^15.5.2",
+    "prop-types": "^15.5.8",
     "react-input-autosize": "^1.1.0"
   },
   "devDependencies": {