diff --git a/composer.json b/composer.json
index a72e3280..e45261b3 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
         "phpunit/phpunit": "^9.5",
         "psalm/plugin-phpunit": "^0.16",
         "psalm/plugin-symfony": "^3.0",
-        "rector/rector": "^0.14",
+        "rector/rector": "^0.15",
         "symfony/config": "^4.4 || ^5.4 || ^6.0",
         "symfony/dependency-injection": "^4.4 || ^5.4 || ^6.0",
         "symfony/framework-bundle": "^4.4 || ^5.4 || ^6.0",
diff --git a/tests/Type/BasePickerTypeTest.php b/tests/Type/BasePickerTypeTest.php
index 81deb3e2..da31d868 100644
--- a/tests/Type/BasePickerTypeTest.php
+++ b/tests/Type/BasePickerTypeTest.php
@@ -32,7 +32,7 @@ final class BasePickerTypeTest extends TestCase
     /**
      * @var Stub&TranslatorInterface
      */
-    private $translator;
+    private TranslatorInterface $translator;
 
     private MomentFormatConverter $momentFormatConverter;
 
diff --git a/tests/Type/DatePickerTypeTest.php b/tests/Type/DatePickerTypeTest.php
index 19b2a8ff..c4dabf56 100644
--- a/tests/Type/DatePickerTypeTest.php
+++ b/tests/Type/DatePickerTypeTest.php
@@ -30,7 +30,7 @@ final class DatePickerTypeTest extends TypeTestCase
     /**
      * @var Stub&TranslatorInterface
      */
-    private $translator;
+    private TranslatorInterface $translator;
 
     protected function setUp(): void
     {
diff --git a/tests/Type/DateTimePickerTypeTest.php b/tests/Type/DateTimePickerTypeTest.php
index a625b266..f1dd663a 100644
--- a/tests/Type/DateTimePickerTypeTest.php
+++ b/tests/Type/DateTimePickerTypeTest.php
@@ -30,7 +30,7 @@ final class DateTimePickerTypeTest extends TypeTestCase
     /**
      * @var Stub&TranslatorInterface
      */
-    private $translator;
+    private TranslatorInterface $translator;
 
     protected function setUp(): void
     {
diff --git a/tests/Validator/ErrorElementTest.php b/tests/Validator/ErrorElementTest.php
index 3820f003..ba3dc0a7 100755
--- a/tests/Validator/ErrorElementTest.php
+++ b/tests/Validator/ErrorElementTest.php
@@ -34,12 +34,12 @@ final class ErrorElementTest extends TestCase
     /**
      * @var ExecutionContextInterface&MockObject
      */
-    private $context;
+    private ExecutionContextInterface $context;
 
     /**
      * @var ContextualValidatorInterface&MockObject
      */
-    private $contextualValidator;
+    private ContextualValidatorInterface $contextualValidator;
 
     private Foo $subject;
 
diff --git a/tests/Validator/InlineValidatorTest.php b/tests/Validator/InlineValidatorTest.php
index afb044c3..e08ced58 100644
--- a/tests/Validator/InlineValidatorTest.php
+++ b/tests/Validator/InlineValidatorTest.php
@@ -32,17 +32,17 @@ final class InlineValidatorTest extends TestCase
     /**
      * @var ContainerInterface&MockObject
      */
-    private $container;
+    private ContainerInterface $container;
 
     /**
      * @var ConstraintValidatorFactoryInterface&MockObject
      */
-    private $constraintValidatorFactory;
+    private ConstraintValidatorFactoryInterface $constraintValidatorFactory;
 
     /**
      * @var ExecutionContextInterface&MockObject
      */
-    private $context;
+    private ExecutionContextInterface $context;
 
     protected function setUp(): void
     {