diff --git a/.npmrc b/.npmrc
index 6a64432..e973926 100644
--- a/.npmrc
+++ b/.npmrc
@@ -1,2 +1,3 @@
 loglevel=error
 fund=false
+engine-strict=true
diff --git a/package-lock.json b/package-lock.json
index a01dc0b..1b9f4e4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -38,6 +38,9 @@
         "webpack-cli": "4.9.2",
         "webpack-manifest-plugin": "4.1.1",
         "webpack-remove-empty-scripts": "0.7.3"
+      },
+      "engines": {
+        "node": ">=15 <17"
       }
     },
     "node_modules/@babel/code-frame": {
diff --git a/package.json b/package.json
index fc82805..781d7a5 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,9 @@
   },
   "author": "Robert Kaussow",
   "license": "MIT",
+  "engines": {
+    "node": ">=15 <17"
+  },
   "dependencies": {
     "@cfworker/json-schema": "1.12.1",
     "clipboard": "2.0.10",