diff --git a/.github/renovate.json5 b/.github/renovate.json5
index 1640dc6..8bcca2a 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -4,6 +4,7 @@
   lockFileMaintenance: {
     enabled: true,
   },
+  separateMinorPatch: true,
   packageRules: [
     {
       description: "Disable docker pinning for devcontainer",
diff --git a/.github/workflows/check-npm.yaml b/.github/workflows/check-npm.yaml
new file mode 100644
index 0000000..0bc4260
--- /dev/null
+++ b/.github/workflows/check-npm.yaml
@@ -0,0 +1,23 @@
+name: Check - npm and dependencies
+
+on:
+  pull_request:
+    paths:
+      - ".github/actions/npm-tools-setup/**"
+      - ".github/workflows/check-npm.yaml"
+      - "package.json"
+      - "package-lock.json"
+  workflow_call:
+  workflow_dispatch:
+
+jobs:
+  duplicate-dependencies:
+    name: Check for duplicate dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Setup npm tools
+        uses: ./.github/actions/npm-tools-setup
+      - name: Check for duplicate dependencies
+        run: npm run check:npm:dedupe
diff --git a/package.json b/package.json
index 1053166..e0ed58f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "scripts": {
     "check:github-actions": "git ls-files '.github/**.yaml' | xargs -t -I {} action-validator {}",
+    "check:npm:dedupe": "npm find-dupes",
     "check:prettier": "prettier --check .",
     "check:pyright": "pyright",
     "check:renovateconfig": "npx --package=renovate -- renovate-config-validator --strict",
diff --git a/pyproject.toml b/pyproject.toml
index 6e24b4f..7c78e37 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ sync = ["sync:uv", "sync:npm"]
 
 "check:github-actions" = "npm run check:github-actions"
 "check:mypy" = "mypy ."
+"check:npm:dedupe" = "npm run check:npm:dedupe"
 "check:prettier" = "npm run check:prettier"
 "check:pyright" = "npm run check:pyright"
 "check:renovateconfig" = "npm run check:renovateconfig"
@@ -34,6 +35,7 @@ check = [
   "check:mypy",
   "check:pytest",
   "check:github-actions",
+  "check:npm:dedupe",
   "check:renovateconfig"
 ]