diff --git a/helpers/package.json b/helpers/package.json
index 4b40e8bb..0453906b 100644
--- a/helpers/package.json
+++ b/helpers/package.json
@@ -14,7 +14,7 @@
   "bugs": "https://github.com/DavidAnson/markdownlint/issues",
   "funding": "https://github.com/sponsors/DavidAnson",
   "engines": {
-    "node": ">=16"
+    "node": ">=18"
   },
   "dependencies": {
     "markdownlint-micromark": "0.1.2"
diff --git a/micromark/package.json b/micromark/package.json
index 9b74cb0b..d90d5d20 100644
--- a/micromark/package.json
+++ b/micromark/package.json
@@ -17,7 +17,7 @@
     "build": "webpack --stats minimal"
   },
   "engines": {
-    "node": ">=16"
+    "node": ">=18"
   },
   "devDependencies": {
     "micromark": "4.0.0",