diff --git a/package.json b/package.json
index 9266214d19..c074d4bfea 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,7 @@
     "glob": "^7.1.2",
     "highlight.js": "^9.12.0",
     "markdown-toc": "^1.2.0",
+    "mkdirp": "^0.5.1",
     "react": "^15.5.4",
     "react-dom": "^15.5.4",
     "react-dom-factories": "^1.0.1",