diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ef2f511
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,84 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+  - "pull_request"
+  - "push"
+
+name: "CI"
+
+permissions:
+  contents: read
+
+jobs:
+  coding-guidelines:
+    name: Coding Guidelines
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.1
+          coverage: none
+
+      - name: Run PHP-CS-Fixer
+        run: ./tools/php-cs-fixer fix --dry-run --show-progress=dots --using-cache=no --verbose
+
+  type-checker:
+    name: Type Checker
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+          coverage: none
+
+      - name: Install dependencies with Composer
+        run: ./tools/composer update --no-interaction --no-ansi --no-progress
+
+      - name: Run Psalm
+        run: ./tools/psalm --config=.psalm/config.xml --no-progress --shepherd --show-info=false --stats
+
+  tests:
+    name: Tests
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version:
+          - "8.1"
+          - "8.2"
+          - "8.3"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3"
+
+      - name: "Install PHP with extensions"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          php-version: "${{ matrix.php-version }}"
+          coverage: "xdebug3"
+
+      - name: "Install dependencies with Composer"
+        run: "./tools/composer update --no-ansi --no-interaction --no-progress"
+
+      - name: "Run tests with PHPUnit"
+        run: "XDEBUG_MODE=coverage php -d pcov.enabled=0 vendor/bin/phpunit --coverage-clover=coverage.xml"
+
+      - name: "Send code coverage report to Codecov.io"
+        env:
+          CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
+        run: "bash <(curl -s https://codecov.io/bash) || true"