diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..fb6ca08
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,38 @@
+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types:
+      - opened
+      - synchronize
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version-file: "pyproject.toml"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+      - name: Install Dependencies
+        run: uv sync --locked --all-extras --dev
+      - name: Lint
+        run: uv run --no-sync scripts/lint.sh
+
+  # https://github.com/marketplace/actions/alls-green#why
+  lint-alls-green:  # This job does nothing and is only used for the branch protection
+    if: always()
+    needs:
+      - lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}
diff --git a/src/fastapi_cloud_cli/commands/deploy.py b/src/fastapi_cloud_cli/commands/deploy.py
index e833f71..89347e2 100644
--- a/src/fastapi_cloud_cli/commands/deploy.py
+++ b/src/fastapi_cloud_cli/commands/deploy.py
@@ -295,7 +295,7 @@ def _configure_app(toolkit: RichToolkit, path_to_deploy: Path) -> AppConfig:
 
     toolkit.print_line()
 
-    selected_app: AppResponse | None = None
+    selected_app: Optional[AppResponse] = None
 
     if not create_new_app:
         with toolkit.progress("Fetching apps...") as progress: