diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
new file mode 100644
index 0000000..72c4935
--- /dev/null
+++ b/.github/workflows/ci.yaml
@@ -0,0 +1,24 @@
+---
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions: {}
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+      - run: script/fmt
+      - uses: pre-commit-ci/lite-action@v1.1.0
+        if: ${{ github.event_name == 'pull_request' }}