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 9ac77b1..24dfe13 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,6 +35,9 @@
         "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 2990034..4e54247 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,9 @@
   },
   "author": "Robert Kaussow",
   "license": "MIT",
+  "engines": {
+    "node": ">=15 <17"
+  },
   "dependencies": {
     "clipboard": "2.0.10",
     "mermaid": "8.13.10",