diff --git a/Tests/Functional/Fixtures/TestObject.php b/Tests/Functional/Fixtures/TestObject.php
index 8686bbd..6f8e667 100644
--- a/Tests/Functional/Fixtures/TestObject.php
+++ b/Tests/Functional/Fixtures/TestObject.php
@@ -9,18 +9,18 @@ class TestObject
     /**
      * @var bool
      */
-    protected $shouldBeTrue = true;
+    protected bool $shouldBeTrue = true;
 
     /**
      * @var bool
      */
-    protected $shouldBeFalse = true;
+    protected bool $shouldBeFalse = true;
 
     /**
      * @Flow\Validate(type="DigiComp.SettingValidator:Settings", options={"name"="TrueValidator"})
      * @var bool
      */
-    protected $shouldBeTrueAndValidatedByAnnotation = false;
+    protected bool $shouldBeTrueAndValidatedByAnnotation = false;
 
     /**
      * @return bool
diff --git a/Tests/Functional/Fixtures/TestValidationGroupsCustomObject.php b/Tests/Functional/Fixtures/TestValidationGroupsCustomObject.php
index 82101ab..b671e00 100644
--- a/Tests/Functional/Fixtures/TestValidationGroupsCustomObject.php
+++ b/Tests/Functional/Fixtures/TestValidationGroupsCustomObject.php
@@ -7,12 +7,12 @@ class TestValidationGroupsCustomObject
     /**
      * @var bool
      */
-    protected $shouldBeTrue = false;
+    protected bool $shouldBeTrue = false;
 
     /**
      * @var bool
      */
-    protected $shouldBeFalse = true;
+    protected bool $shouldBeFalse = true;
 
     /**
      * @return bool
diff --git a/Tests/Functional/Fixtures/TestValidationGroupsDefaultObject.php b/Tests/Functional/Fixtures/TestValidationGroupsDefaultObject.php
index ef9f909..30261b2 100644
--- a/Tests/Functional/Fixtures/TestValidationGroupsDefaultObject.php
+++ b/Tests/Functional/Fixtures/TestValidationGroupsDefaultObject.php
@@ -7,12 +7,12 @@ class TestValidationGroupsDefaultObject
     /**
      * @var bool
      */
-    protected $shouldBeTrue = false;
+    protected bool $shouldBeTrue = false;
 
     /**
      * @var bool
      */
-    protected $shouldBeFalse = true;
+    protected bool $shouldBeFalse = true;
 
     /**
      * @return bool