diff --git a/package.json b/package.json
index 1276ede0..f29ef3d0 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,8 @@
     "worker-loader": "^0.7.1",
     "xml": "1.0.1",
     "xml-but-prettier": "^1.0.1",
-    "yaml-js": "0.2.0"
+    "yaml-js": "0.2.0",
+    "zenscroll": "4.0.0"
   },
   "devDependencies": {
     "autoprefixer": "7.1.1",