diff --git a/.github/renovate.json5 b/.github/renovate.json5
new file mode 100644
index 0000000..137c058
--- /dev/null
+++ b/.github/renovate.json5
@@ -0,0 +1,9 @@
+{
+  $schema: "https://docs.renovatebot.com/renovate-schema.json",
+  extends: ["config:best-practices", "config:js-app", "npm:unpublishSafe"],
+  lockFileMaintenance: {
+    enabled: true,
+  },
+  postUpdateOptions: ["npmDedupe"],
+  separateMinorPatch: true,
+}
diff --git a/.github/workflows/check.yaml b/.github/workflows/check.yaml
index 10f0b01..7dc536f 100644
--- a/.github/workflows/check.yaml
+++ b/.github/workflows/check.yaml
@@ -20,3 +20,10 @@ jobs:
         run: npm ci
       - name: Check format
         run: npm run format
+
+  renovate-config-validator:
+    name: "Renovate config validator"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: suzuki-shunsuke/github-action-renovate-config-validator@v1.1.0
diff --git a/package-lock.json b/package-lock.json
index c91e82f..31c3480 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,6 +7,9 @@
     "": {
       "devDependencies": {
         "prettier": "3.3.3"
+      },
+      "engines": {
+        "node": "^18.0.0"
       }
     },
     "node_modules/prettier": {
diff --git a/package.json b/package.json
index 5953bfa..291c14b 100644
--- a/package.json
+++ b/package.json
@@ -1,9 +1,14 @@
 {
   "scripts": {
     "format": "prettier --check .",
-    "format:fix": "prettier --write ."
+    "format:fix": "prettier --write .",
+    "renovateconfig": "npm exec --package=renovate -- renovate-config-validator --strict"
   },
   "devDependencies": {
     "prettier": "3.3.3"
-  }
+  },
+  "engines": {
+    "node": "^18.0.0"
+  },
+  "private": true
 }