diff --git a/package.json b/package.json
index da913d5..87e4d1d 100644
--- a/package.json
+++ b/package.json
@@ -59,6 +59,7 @@
     "pngjs": "^3.3.2",
     "progress": "^2.0.0",
     "request": "^2.88.0",
+    "require-dir": "^1.1.0",
     "string-argv": "0.0.2",
     "uuid": "^3.3.2",
     "yargs": "^12.0.1"