diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..41050f3
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["3.13", "3.14"]
+    steps:
+      - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.3.2
+        with:
+          python-version: ${{ matrix.python }}
+          enable-cache: true
+      - run: uv sync --all-extras --locked
+      - run: uv run ruff check
+      - run: uv run ruff format --check
+      - run: uv run ty check
+      - run: uv run pytest
+      - run: uv build
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 35973da..14e54d1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -17,7 +17,7 @@ uv run ty check
 uv run pytest
 ```
 
-All four must be clean.
+All four must be clean. CI runs them, and `uv build`, on Python 3.13 and 3.14 for every pull request.
 
 ## Pull requests