diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a08c2652eac..842b01fee4c 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -25,35 +25,27 @@ jobs:
           - '7.2'
           - '7.3'
           - '7.4'
-        phpunit-version: ['8.5']
         dependencies: [highest]
         allowed_to_fail: [false]
         variant: [normal]
         include:
           - php-version: '7.2'
-            phpunit-version: '8.5'
             dependencies: lowest
             allowed_to_fail: false
             variant: normal
           - php-version: '8.0'
-            phpunit-version: '9.3'
             dependencies: highest
             allowed_to_fail: true
             variant: normal
           - php-version: '7.3'
-            phpunit-version: '8.5'
             dependencies: highest
             allowed_to_fail: false
             variant: 'symfony/symfony:"4.4.*"'
           - php-version: '7.3'
-            phpunit-version: '8.5'
             dependencies: highest
             allowed_to_fail: false
             variant: 'sonata-project/block-bundle:"3.*"'
 
-    env:
-      SYMFONY_PHPUNIT_VERSION: ${{ matrix.phpunit-version }}
-
     steps:
       - name: Checkout
         uses: actions/checkout@v2
diff --git a/tests/Admin/AdminTest.php b/tests/Admin/AdminTest.php
index f56e2ae2dfe..b4a19b6721d 100644
--- a/tests/Admin/AdminTest.php
+++ b/tests/Admin/AdminTest.php
@@ -694,11 +694,20 @@ public function testToString(): void
         $s = new FooToString();
         $this->assertSame('salut', $admin->toString($s));
 
+        $this->assertSame('', $admin->toString(false));
+    }
+
+    public function testToStringNull(): void
+    {
+        if (\PHP_VERSION_ID >= 80000) {
+            $this->markTestSkipped('PHP 8.0 does not allow __toString() method to return null');
+        }
+
+        $admin = new PostAdmin('sonata.post.admin.post', 'NewsBundle\Entity\Post', 'Sonata\NewsBundle\Controller\PostAdminController');
+
         // To string method is implemented, but returns null
         $s = new FooToStringNull();
         $this->assertNotEmpty($admin->toString($s));
-
-        $this->assertSame('', $admin->toString(false));
     }
 
     public function testIsAclEnabled(): void
diff --git a/tests/Command/SetupAclCommandTest.php b/tests/Command/SetupAclCommandTest.php
index 0d836543d99..8d5a520d757 100644
--- a/tests/Command/SetupAclCommandTest.php
+++ b/tests/Command/SetupAclCommandTest.php
@@ -77,14 +77,4 @@ public function testExecuteWithException1(): void
             $commandTester->getDisplay()
         );
     }
-
-    public function testExecuteWithException2(): void
-    {
-        $pool = new Pool($this->container, '', '');
-
-        $this->expectException(\TypeError::class);
-        $this->expectExceptionMessage(sprintf('Argument 2 passed to %s::__construct() must implement interface %s, instance of %s given', SetupAclCommand::class, AdminAclManipulatorInterface::class, \stdClass::class));
-
-        new SetupAclCommand($pool, new \stdClass());
-    }
 }