diff --git a/package-lock.json b/package-lock.json
index bc22d8b..aed7803 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,9 @@
       "dependencies": {
         "auspice": "2.39.0",
         "heroku-ssl-redirect": "0.0.4"
+      },
+      "engines": {
+        "node": "16.x"
       }
     },
     "node_modules/@ampproject/remapping": {
diff --git a/package.json b/package.json
index 03516b1..a76efe7 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,9 @@
   "version": "0.12.0",
   "author": "James Hadfield",
   "license": "AGPL-3.0-only",
+  "engines": {
+    "node": "16.x"
+  },
   "scripts": {
     "modify-auspice-server": "node scripts/modify-auspice-server.js",
     "postinstall": "npm run modify-auspice-server",