diff --git a/package.json b/package.json
index 1a95c45..0d63fc4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "engines": {
-    "node": "10.4.0"
+    "node": "10.4.0",
+    "yarn": "1.9.4"
   },
   "dependencies": {
     "@rails/webpacker": "3.5",