diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1cd4ea2..512652a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,48 +1,84 @@
 name: CI
 
 on:
-    push:
-        branches: [ master ]
-    pull_request:
-        branches: [ master ]
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
-    checks:
-        runs-on: ubuntu-latest
-        name: 'Check'
-        steps:
-            - name: Checkout code
-              uses: actions/checkout@v4
-
-            - name: Get composer cache directory
-              id: composer-cache
-              run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
-
-            - name: Cache dependencies
-              uses: actions/cache@v4
-              with:
-                path: ${{ steps.composer-cache.outputs.dir }}
-                key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
-                restore-keys: ${{ runner.os }}-composer-
-
-            - name: Setup PHP
-              uses: shivammathur/setup-php@v2
-              with:
-                  php-version: '8.3'
-                  coverage: pcov
-                  tools: infection, pint, phpstan
-
-            - name: Install dependencies
-              run: composer install
-
-            - name: Check platform requirements
-              run: composer check-platform-reqs
-
-            - name: Pint
-              run: pint --test
-
-            - name: Infection
-              run: infection --min-msi=100
-
-            - name: PHPStan
-              run: phpstan
+  checks:
+    runs-on: ubuntu-latest
+    name: 'Check'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          coverage: pcov
+          tools: infection, pint, phpstan
+
+      - name: Install dependencies
+        run: composer install
+
+      - name: Check platform requirements
+        run: composer check-platform-reqs
+
+      - name: Pint
+        run: pint --test
+
+      - name: Infection
+        run: infection --min-msi=100
+
+      - name: PHPStan
+        run: phpstan
+  tests:
+    runs-on: ubuntu-latest
+    name: 'Test'
+    strategy:
+      matrix:
+        php-version: ['8.1', '8.2', '8.3']
+        phpunit-versions: ['^9.0', '^10.0', '^11.0']
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php-versions}}-phpunit-${{ matrix.phpunit-versions }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php-versions}}-phpunit-${{ matrix.phpunit-versions }}-composer-
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: pcov
+          tools: infection, pint, phpstan
+
+      - name: Install dependencies
+        run: |
+          composer require phpunit/phpunit:${{ matrix.phpunit-versions }} --no-update
+          composer update
+
+      - name: PHPUnit
+        run: ./vendor/bin/phpunit