diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4451503
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,18 @@
+name: CI
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [20, 22]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install --no-audit --no-fund
+      - run: npm test
diff --git a/package.json b/package.json
index c4bbf7f..e1fb4a3 100644
--- a/package.json
+++ b/package.json
@@ -7,14 +7,15 @@
     "git-pulse": "./bin/pulse.js"
   },
   "scripts": {
-    "start": "node bin/pulse.js"
+    "start": "node bin/pulse.js",
+    "test": "node --test"
   },
   "dependencies": {
     "chalk": "^5.3.0",
     "commander": "^12.0.0"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "author": "NickCirv <nick@cirvgreen.com>",
   "license": "MIT",
diff --git a/test/smoke.test.js b/test/smoke.test.js
new file mode 100644
index 0000000..2c3dbd3
--- /dev/null
+++ b/test/smoke.test.js
@@ -0,0 +1,6 @@
+import { test } from 'node:test'
+import { execFileSync } from 'node:child_process'
+import { fileURLToPath } from 'node:url'
+import { dirname, join } from 'node:path'
+const root = join(dirname(fileURLToPath(import.meta.url)), '..')
+test('entry is valid JavaScript', () => { execFileSync('node', ['--check', join(root, 'bin/pulse.js')]) })