diff --git a/package.json b/package.json
index 9053931..d993bbd 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "gatsby-source-filesystem": "^1.5.5",
     "gatsby-transformer-remark": "^1.7.17",
     "gatsby-transformer-sharp": "^1.6.13",
+    "prop-types": "^15.6.0",
     "react": "^16.2.0",
     "react-load-script": "0.0.6"
   },