diff --git a/package.json b/package.json
index e2abb50..0031ef6 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
     "matrix-js-sdk": "^9.10.0",
     "moment": "^2.29.1",
     "node-sass": "^5.0.0",
+    "prop-types": "^15.7.2",
     "react": "^17.0.2",
     "react-bootstrap": "^1.5.2",
     "react-dom": "^17.0.2",