diff --git a/package.json b/package.json
index 143828f..f6dab52 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,9 @@
   ],
   "devDependencies": {
     "marked-man": "^0.2.1",
+    "mkdirp": "^0.5.1",
     "nyc": "^10.3.2",
+    "rimraf": "^2.6.1",
     "standard": "^9.0.2",
     "standard-version": "^4.0.0",
     "tacks": "^1.2.6",