diff --git a/package.json b/package.json
index 68cb8fa2..49a87e29 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
         "ace-builds": "^1.4.12",
         "file-saver": "^2.0.5",
         "node-sass": "^4.14.1",
+        "prop-types": "^15.7.2",
         "react": "^16.13.1",
         "react-ace": "^9.2.1",
         "react-dom": "^16.13.1",