diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..e79e2f0
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write # to get the OIDC token
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+      - name: Cache uv dependencies
+        uses: actions/cache@v4
+        with:
+          path: .uv-cache
+          key: ${{ runner.os }}-uv-${{ hashFiles('**/uv.lock') }}
+      - name: Install dependencies
+        run: uv sync --all-extras --cache-dir .uv-cache
+      - name: Run tests
+        run: uv run pytest --cov src --cov-branch --cov-report term --cov-report xml:coverage.xml
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          use_oidc: true
+
+  ruff_check:
+    name: ruff
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run ruff
+        uses: astral-sh/ruff-action@v1
+        with:
+          args: 'check --output-format=github'
+      - name: Run ruff format
+        uses: astral-sh/ruff-action@v1
+        with:
+          args: 'format --check'
diff --git a/README.md b/README.md
index 8e6ccc4..20e0c53 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Tomlscript
 
+[![codecov](https://codecov.io/gh/phihung/tomlscript/branch/main/graph/badge.svg)](https://codecov.io/gh/phihung/tomlscript)
+
 A lightweight, dependency-free tool to manage your scripts directly from pyproject.toml
 
 <div style="display: flex; justify-content: space-between;align-items: center;">