diff --git a/package.json b/package.json
index b7dac7a..c5468c6 100644
--- a/package.json
+++ b/package.json
@@ -71,6 +71,7 @@
     "eslint-plugin-react": "^7.18.0",
     "eslint-plugin-standard": "^4.0.1",
     "eslint-plugin-vue": "^6.1.2",
+    "esm": "^3.2.25",
     "express": "^4.17.1",
     "finalhandler": "^1.1.2",
     "get-port": "^5.1.1",