diff --git a/package-lock.json b/package-lock.json
index 4d66db6..ce62480 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,6 +11,10 @@
         "@antora/site-generator": "3.0",
         "@deepsymmetry/asciidoctor-bytefield": "^1.5.0",
         "@djencks/asciidoctor-mathjax": "0.0.7"
+      },
+      "engines": {
+        "node": ">=16.13.1",
+        "npm": ">=8.4.1"
       }
     },
     "node_modules/@antora/asciidoc-loader": {
diff --git a/package.json b/package.json
index bc144e3..e205911 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,10 @@
     "@deepsymmetry/asciidoctor-bytefield": "^1.5.0",
     "@djencks/asciidoctor-mathjax": "0.0.7"
   },
+  "engines": {
+    "node": ">=16.13.1",
+    "npm": ">=8.4.1"
+  },
   "scripts": {
     "local-docs": "npx antora --fetch doc/local.yml"
   },