diff --git a/package.json b/package.json
index e0169ea..16d74bc 100644
--- a/package.json
+++ b/package.json
@@ -46,6 +46,7 @@
     "classnames": "^2.2.5"
   },
   "peerDependencies": {
+    "prop-types": "^15.5.0",
     "react": "^15.x.x || ^16.x.x",
     "react-dom": "^15.x.x || ^16.x.x"
   },