diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ef27164
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    name: Test and typecheck
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Set up Bun
+        uses: oven-sh/setup-bun@v2
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+      - name: Run tests
+        run: bun test
+      - name: Typecheck
+        run: bunx tsc --noEmit