diff --git a/.github/workflows/test-application.yaml b/.github/workflows/test-application.yaml
index c7022446..c8d8261d 100644
--- a/.github/workflows/test-application.yaml
+++ b/.github/workflows/test-application.yaml
@@ -151,7 +151,7 @@ jobs:
             - name: Install and configure PHP
               uses: shivammathur/setup-php@v2
               with:
-                  php-version: 8.1
+                  php-version: 8.3
                   extensions: 'imagick'
                   tools: 'composer:v2'
                   coverage: none
diff --git a/Tests/Functional/Metadata/DynamicFormMetadataLoaderTest.php b/Tests/Functional/Metadata/DynamicFormMetadataLoaderTest.php
index 39f800f2..0fd37ce6 100644
--- a/Tests/Functional/Metadata/DynamicFormMetadataLoaderTest.php
+++ b/Tests/Functional/Metadata/DynamicFormMetadataLoaderTest.php
@@ -238,8 +238,8 @@ public function testGetMetadataAttachmentEnglish(): void
         $this->assertEquals('number', $attachment->getItems()['options/max']->getType());
         $this->assertEquals(6, $attachment->getItems()['options/max']->getColspan());
 
-        $this->assertObjectHasAttribute('schema', $attachment);
-        $this->assertObjectHasAttribute('key', $attachment);
+        $this->assertTrue(isset($attachment->schema));
+        $this->assertTrue(isset($attachment->key));
     }
 
     public function testGetMetadataAttachmentGerman(): void