diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..bbb5615
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,57 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        python:
+          - "3.5"
+          - "3.8"
+          - pypy-3.7
+        install_libcxx:
+          - false
+          - true
+        exclude:
+          - os: windows-latest
+            install_libcxx: true
+          - os: macos-latest
+            install_libcxx: true
+          - os: macos-latest
+            python: pypy-3.7
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Uninstall libcxx
+        if: ${{ matrix.os == 'ubuntu-latest' && !matrix.install_libcxx }}
+        run: |
+          DEBIAN_FRONTEND=noninteractive sudo apt-get purge -y 'libc++*'
+      - name: Install libcxx
+        if: ${{ matrix.install_libcxx }}
+        run: |
+          DEBIAN_FRONTEND=noninteractive sudo apt-get install -y libc++-dev libc++abi-dev
+      - name: Install flake8
+        run: python -m pip install flake8
+      - name: Fetch fixtures
+        run: ./script/fetch-fixtures
+      - name: Lint
+        run: ./script/lint
+      - name: Test
+        shell: bash
+        run: |
+          CFLAGS="-O0 -g" python setup.py test