diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e55ee40d43..ec13cde2b7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -25,63 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: 7.1.8
-          - php: 7.1.28
-          - php: 7.1
-          - php: 7.1
-            setup: lowest
-
-          - php: 7.2.0
-          - php: 7.2.15
-          - php: 7.2
-          - php: 7.2
-            setup: lowest
-
-          - php: 7.3.0
-          - php: 7.3.5
-          - php: 7.3
-          - php: 7.3
-            setup: lowest
-
-          - php: 7.4
           - php: 7.4
-            setup: lowest
-
-          - php: 8.0
-            classmap-authoritative: true
-
-          - php: 8.0
-          - php: 8.0
-            setup: lowest
-
-          - php: 8.1
-          - php: 8.1
-            setup: lowest
-
-          - php: 8.2
-          - php: 8.2
-            setup: lowest
-
-          - php: 8.0
-            laravel: true
-            reference: 9.x
-
-          - php: 8.0
-            laravel: true
-            reference: 9.x
-            classmap-authoritative: true
-
-          - php: 8.1
-            coverage: true
-
-          - php: 8.1
-            laravel: true
-            reference: master
-
-          - php: 8.1
-            laravel: true
-            reference: master
-            classmap-authoritative: true
 
     name: ${{ matrix.laravel && 'Laravel compatibility - ' || '' }}${{ matrix.classmap-authoritative && 'classmap-authoritative - ' || '' }}${{ matrix.coverage && 'Coverage - ' || '' }}PHP ${{ matrix.php }} - ${{ matrix.setup || 'stable' }} - ubuntu
 
@@ -136,7 +80,7 @@ jobs:
             php -d memory_limit=-1 -d zend.enable_gc=0 -d error_reporting=-1 vendor/phpunit/phpunit/phpunit --coverage-clover=coverage.xml --coverage-text;
           fi;
           if [[ "${{ matrix.laravel }}" != 'true' && "${{ matrix.coverage }}" != 'true' ]]; then
-            php -d memory_limit=-1 -d zend.enable_gc=0 -d error_reporting=-1 vendor/phpunit/phpunit/phpunit;
+            php -d memory_limit=-1 -d zend.enable_gc=0 -d error_reporting=-1 vendor/phpunit/phpunit/phpunit --group i;
           fi;
           if [[ "${{ matrix.laravel }}" = 'true' ]]; then
             vendor/bin/multi-tester tests/Laravel/laravel-${{ matrix.reference }}.multi-tester.yml;
@@ -161,88 +105,3 @@ jobs:
       - name: Coverage
         uses: codecov/codecov-action@v1
         if: matrix.coverage
-
-  windows:
-    runs-on: windows-latest
-
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - php: 7.1.8
-          - php: 7.1.28
-          - php: 7.1
-          - php: 7.1
-            setup: lowest
-
-          - php: 7.2.0
-          - php: 7.2.15
-          - php: 7.2
-          - php: 7.2
-            setup: lowest
-
-          - php: 7.3.0
-          - php: 7.3.5
-          - php: 7.3
-          - php: 7.3
-            setup: lowest
-
-          - php: 7.4
-            coverage: true
-          - php: 7.4
-            setup: lowest
-
-          - php: 8.0
-          - php: 8.0
-            setup: lowest
-
-          - php: 8.1
-          - php: 8.1
-            setup: lowest
-
-          - php: 8.2
-          - php: 8.2
-            setup: lowest
-
-    name: PHP ${{ matrix.php }} - ${{ matrix.setup || 'stable' }} - windows
-
-    steps:
-      - name: Checkout the code
-        uses: actions/checkout@v3
-
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php }}
-          extensions: json
-          tools: composer:v2
-          coverage: none
-
-      - name: Get composer cache directory
-        id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-      - name: Cache composer dependencies
-        uses: actions/cache@v3
-        with:
-          path: ${{ steps.composer-cache.outputs.dir }}
-          key: "php-${{ matrix.php }}-{{ matrix.setup }}-windows-${{ hashFiles('**/composer.json') }}"
-          restore-keys: "php-${{ matrix.php }}-{{ matrix.setup }}-windows-${{ hashFiles('**/composer.json') }}"
-
-      - name: Install dependencies
-        uses: nick-fields/retry@v2
-        with:
-          timeout_minutes: 10
-          max_attempts: 3
-          command: |
-            composer remove --no-update kylekatarnls/multi-tester phpmd/phpmd friendsofphp/php-cs-fixer --no-interaction --dev;
-            ${{ matrix.php >= 8.1 && 'composer require --no-update phpunit/phpunit:^9.5.20 --no-interaction --dev;' || '' }}
-            composer update --prefer-dist --no-progress --prefer-${{ matrix.setup || 'stable' }}${{ matrix.php >= 8.2 && ' --ignore-platform-reqs' || '' }};
-
-      - name: Run test suite
-        run: |
-          php -d memory_limit=-1 -d zend.enable_gc=0 -d error_reporting=-1 vendor/phpunit/phpunit/phpunit;
-        env:
-          PHP_VERSION: ${{ matrix.php }}
-          REDIS_HOST: 127.0.0.1
-          REDIS_PORT: 6379
diff --git a/tests/CarbonImmutable/SerializationTest.php b/tests/CarbonImmutable/SerializationTest.php
index cd79c80ab4..d874b63c31 100644
--- a/tests/CarbonImmutable/SerializationTest.php
+++ b/tests/CarbonImmutable/SerializationTest.php
@@ -41,9 +41,12 @@ protected function setUp(): void
             : ['O:22:"Carbon\CarbonImmutable":3:{s:4:"date";s:26:"2016-02-01 13:20:25.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:15:"America/Toronto";}'];
     }
 
+    /** @group i */
     public function testSerialize()
     {
         $dt = Carbon::create(2016, 2, 1, 13, 20, 25);
+        var_dump($this->serialized, serialize($dt));
+        exit;
         $this->assertContains($dt->serialize(), $this->serialized);
         $this->assertContains(serialize($dt), $this->serialized);
     }