diff --git a/src/package.json b/src/package.json
index 274e0e282..780ef587f 100644
--- a/src/package.json
+++ b/src/package.json
@@ -3,6 +3,10 @@
   "version": "1.0.0",
   "description": "========================",
   "main": "index.js",
+  "engines": {
+    "node": "21.7.3"
+  },
+  "engineStrict": true,
   "scripts": {
     "pa11y-ci": "pa11y-ci",
     "test": "echo \"Error: no test specified\" && exit 1"