diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index 90ec22b..0000000
--- a/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-.svn
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..ab59148
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,9 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 3.0.0 - 2020-08-31
+
+Start of the changelog.
diff --git a/Classes/Package.php b/Classes/Package.php
index 7f7f1b8..cd71a3c 100644
--- a/Classes/Package.php
+++ b/Classes/Package.php
@@ -14,19 +14,17 @@ namespace DigiComp\SettingValidator;
 
 use Neos\Flow\Configuration\ConfigurationManager;
 use Neos\Flow\Core\Bootstrap;
-use Neos\Flow\Package\Package as BasePackage;
+use Neos\Flow\Package\Package as NeosFlowPackagePackage;
 
 /**
  * Package base class of the DigiComp.SettingValidator package.
  */
-class Package extends BasePackage
+class Package extends NeosFlowPackagePackage
 {
-    const CONFIGURATION_TYPE_VALIDATION = 'Validation';
-
     /**
      * @param Bootstrap $bootstrap
      */
-    public function boot(Bootstrap $bootstrap)
+    public function boot(Bootstrap $bootstrap): void
     {
         parent::boot($bootstrap);
 
@@ -35,11 +33,7 @@ class Package extends BasePackage
             ConfigurationManager::class,
             'configurationManagerReady',
             function (ConfigurationManager $configurationManager) {
-                $configurationManager->registerConfigurationType(
-                    static::CONFIGURATION_TYPE_VALIDATION,
-                    ConfigurationManager::CONFIGURATION_PROCESSING_TYPE_DEFAULT,
-                    true
-                );
+                $configurationManager->registerConfigurationType('Validation');
             }
         );
     }
diff --git a/Classes/Validation/Validator/SettingsValidator.php b/Classes/Validation/Validator/SettingsValidator.php
index c79103d..8b825d8 100644
--- a/Classes/Validation/Validator/SettingsValidator.php
+++ b/Classes/Validation/Validator/SettingsValidator.php
@@ -13,10 +13,9 @@ namespace DigiComp\SettingValidator\Validation\Validator;
  */
 
 use Neos\Flow\Annotations as Flow;
-use Neos\Flow\Configuration\ConfigurationManager;
-use Neos\Flow\Reflection\ReflectionService;
 use Neos\Flow\Validation\Exception\InvalidValidationConfigurationException;
 use Neos\Flow\Validation\Exception\InvalidValidationOptionsException;
+use Neos\Flow\Validation\Exception\NoSuchValidatorException;
 use Neos\Flow\Validation\Validator\AbstractValidator;
 use Neos\Flow\Validation\ValidatorResolver;
 use Neos\Utility\ObjectAccess;
@@ -28,72 +27,45 @@ use Neos\Utility\TypeHandling;
 class SettingsValidator extends AbstractValidator
 {
     /**
-     * @var ValidatorResolver
      * @Flow\Inject
+     * @var ValidatorResolver
      */
     protected $validatorResolver;
 
     /**
-     * @var ConfigurationManager
-     */
-    protected $configurationManager;
-
-    /**
-     * @var ReflectionService
-     * @Flow\Inject
-     * @deprecated
-     */
-    protected $reflectionService;
-
-    /**
+     * @Flow\InjectConfiguration(type="Validation")
      * @var array
      */
+    protected array $validations;
+
+    /**
+     * @inheritDoc
+     */
     protected $supportedOptions = [
-        'name' => ['', 'Set the name of the setting-array to use', 'string', false],
-        'validationGroups' => [
-            ['Default'],
-            'Same as "Validation Groups" of Flow Framework. Defines the groups to execute.',
-            'array',
-            false
-        ],
+        'name' => ['', 'Name of the setting array to use', 'string'],
+        'validationGroups' => [['Default'], 'Same as "Validation Groups" of Flow Framework', 'array'],
     ];
 
     /**
-     * @var array
-     */
-    protected $validations;
-
-    /**
-     * @param ConfigurationManager $configurationManager
-     */
-    public function injectConfigurationManager(ConfigurationManager $configurationManager)
-    {
-        $this->configurationManager = $configurationManager;
-        $this->validations = $this->configurationManager->getConfiguration('Validation');
-    }
-
-    /**
-     * Check if $value is valid. If it is not valid, needs to add an error
-     * to Result.
-     *
-     * @param mixed $value
+     * @inheritDoc
      * @throws InvalidValidationOptionsException
      * @throws InvalidValidationConfigurationException
+     * @throws NoSuchValidatorException
      */
-    protected function isValid($value)
+    protected function isValid($value): void
     {
-        $name = $this->options['name'] ? $this->options['name'] : TypeHandling::getTypeForValue($value);
-        if (! isset($this->validations[$name])) {
+        $validations = $this->validations;
+
+        $name = $this->options['name'] !== '' ? $this->options['name'] : TypeHandling::getTypeForValue($value);
+        if (!isset($validations[$name])) {
             throw new InvalidValidationOptionsException(
-                'The name ' . $name . ' has not been defined in Validation.yaml!',
+                'The name "' . $name . '" has not been defined in Validation.yaml!',
                 1397821438
             );
         }
 
-        $config = $this->getConfigForName($name);
-
-        foreach ($config as $validatorConfig) {
-            if (! $this->doesValidationGroupsMatch($validatorConfig)) {
+        foreach ($this->getConfigForValidation($validations[$name]) as $validatorConfig) {
+            if (!$this->doesValidationGroupsMatch($validatorConfig)) {
                 continue;
             }
 
@@ -104,10 +76,10 @@ class SettingsValidator extends AbstractValidator
                 $validatorConfig['options']
             );
 
-            if (! $validator) {
+            if ($validator === null) {
                 throw new InvalidValidationConfigurationException(
-                    sprintf(
-                        'Validator could not be resolved: "%s" Check your Validation.yaml',
+                    \sprintf(
+                        'Validator "%s" could not be resolved. Check your Validation.yaml',
                         $validatorConfig['validator']
                     ),
                     1402326139
@@ -115,45 +87,50 @@ class SettingsValidator extends AbstractValidator
             }
 
             if (isset($validatorConfig['property'])) {
-                $this->result->forProperty($validatorConfig['property'])->merge(
+                $this->getResult()->forProperty($validatorConfig['property'])->merge(
                     $validator->validate(ObjectAccess::getPropertyPath($value, $validatorConfig['property']))
                 );
             } else {
-                $this->result->merge($validator->validate($value));
+                $this->getResult()->merge($validator->validate($value));
             }
         }
     }
 
     /**
-     * @param string $name
+     * @param array $validation
      * @return array
      */
-    protected function getConfigForName($name): array
+    protected function getConfigForValidation(array $validation): array
     {
         $config = [];
-        if (isset($this->validations[$name]['self'])) {
-            foreach ($this->validations[$name]['self'] as $validator => &$validation) {
-                if (is_null($validation)) {
+
+        if (isset($validation['self'])) {
+            foreach ($validation['self'] as $validator => $options) {
+                if ($options === null) {
                     continue;
                 }
-                $newValidation['options'] = $validation;
-                $newValidation['validator'] = $validator;
-                $config[] = $newValidation;
+                $config[] = [
+                    'validator' => $validator,
+                    'options' => $options,
+                ];
             }
         }
-        if (isset($this->validations[$name]['properties'])) {
-            foreach ($this->validations[$name]['properties'] as $propertyName => &$validation) {
-                foreach ($validation as $validator => &$options) {
-                    if (is_null($options)) {
+
+        if (isset($validation['properties'])) {
+            foreach ($validation['properties'] as $property => $propertyValidation) {
+                foreach ($propertyValidation as $validator => $options) {
+                    if ($options === null) {
                         continue;
                     }
-                    $newValidation['property'] = $propertyName;
-                    $newValidation['validator'] = $validator;
-                    $newValidation['options'] = $options;
-                    $config[] = $newValidation;
+                    $config[] = [
+                        'property' => $property,
+                        'validator' => $validator,
+                        'options' => $options,
+                    ];
                 }
             }
         }
+
         return $config;
     }
 
@@ -163,13 +140,13 @@ class SettingsValidator extends AbstractValidator
      * @param array $validatorConfig
      * @return bool
      */
-    protected function doesValidationGroupsMatch(array &$validatorConfig)
+    protected function doesValidationGroupsMatch(array $validatorConfig): bool
     {
-        if (isset($validatorConfig['options']['validationGroups']) && empty(array_intersect($validatorConfig['options']['validationGroups'], $this->options['validationGroups']))) {
-            return false;
-        }
-
-        return true;
+        return !isset($validatorConfig['options']['validationGroups'])
+            || \array_intersect(
+                $validatorConfig['options']['validationGroups'],
+                $this->options['validationGroups']
+            ) !== [];
     }
 
     /**
@@ -177,12 +154,12 @@ class SettingsValidator extends AbstractValidator
      *
      * @param array $validatorConfig
      */
-    protected function handleValidationGroups(array &$validatorConfig)
+    protected function handleValidationGroups(array &$validatorConfig): void
     {
-        if (isset($validatorConfig['options']['validationGroups']) && $validatorConfig['validator'] !== 'DigiComp.SettingValidator:Settings') {
-            unset($validatorConfig['options']['validationGroups']);
-        } elseif ($validatorConfig['validator'] === 'DigiComp.SettingValidator:Settings') {
+        if ($validatorConfig['validator'] === 'DigiComp.SettingValidator:Settings') {
             $validatorConfig['options']['validationGroups'] = $this->options['validationGroups'];
+        } elseif (isset($validatorConfig['options']['validationGroups'])) {
+            unset($validatorConfig['options']['validationGroups']);
         }
     }
 }
diff --git a/Migrations/Code/Version20170603120900.php b/Migrations/Code/Version20170603120900.php
index 4df7e83..ff218d9 100644
--- a/Migrations/Code/Version20170603120900.php
+++ b/Migrations/Code/Version20170603120900.php
@@ -2,29 +2,24 @@
 
 namespace Neos\Flow\Core\Migrations;
 
-use DigiComp\SettingValidator\Package;
-
 /**
- * Restructures Validation.yamls to new format
+ * Restructures all Validation.yaml to new format
  */
 class Version20170603120900 extends AbstractMigration
 {
     /**
      * @return string
      */
-    public function getIdentifier()
+    public function getIdentifier(): string
     {
         return 'DigiComp.SettingValidator-20170603120900';
     }
 
-    /**
-     * @return void
-     */
-    public function up()
+    public function up(): void
     {
         $this->processConfiguration(
-            Package::CONFIGURATION_TYPE_VALIDATION,
-            function (&$configuration) {
+            'Validation',
+            function (array &$configuration) {
                 foreach ($configuration as $validatorName => &$validators) {
                     // guard that protects configuration, which has already the new format:
                     if (isset($validators['properties']) || isset($validators['self'])) {
@@ -32,10 +27,12 @@ class Version20170603120900 extends AbstractMigration
                     }
                     $newConfiguration = ['properties' => [], 'self' => []];
 
-                    foreach ($validators as $key => &$validator) {
-                        if (! isset($validator['validator']) || ! isset($validator['options'])) {
-                            $this->showWarning('The Validation.yaml files contained no validator or options for ' .
-                                'validation: "' . $validatorName . '.' . $key . '". It was not migrated.');
+                    foreach ($validators as $key => $validator) {
+                        if (!isset($validator['validator']) || !isset($validator['options'])) {
+                            $this->showWarning(
+                                'The Validation.yaml files contained no validator or options for validation: ' .
+                                '"' . $validatorName . '.' . $key . '". It was not migrated.'
+                            );
                             continue;
                         }
                         if (isset($validator['property'])) {
diff --git a/README.md b/README.md
index d4274f4..fc438b7 100644
--- a/README.md
+++ b/README.md
@@ -1,44 +1,38 @@
-DigiComp.SettingValidator
--------------------------
+# DigiComp.SettingValidator
 
-
-This Package allows to configure Validators for your Action-Arguments or domain model properties to be set by a new
+This Package allows configuring Validators for your Action-Arguments or domain model properties to be set by a new
 Yaml-File in your Configuration directory.
 
-Lets imagine you had this action-method:
+Let's imagine you had this action-method:
 
     /**
+     * @Flow\Validate(argumentName="order", type="DigiComp.SettingValidator:Settings")
      * @param Order $order
-     * @Flow\Validate(type="DigiComp.SettingValidator:Settings")
      */
     public function createOrder($order) {...}
 
 Then your Validation.yaml could look like this:
 
-    SuperVendor\SuperPackage\Domain\Model\Order:
-      -
-        property: price
-        validator: NumberRange
-        options:
-          maximum: 20
-          minimum: 10
-      -
-        validator: SuperVendor.SuperPackage:SomeOtherValidator #validates the complete object
-        options: []
-      -
-        property: customer
-        validator: DigiComp.SettingValidator:Settings
-        options:
-          name: OrderCustomer
+    Vendor\Package\Domain\Model\Order:
+      # validates the complete object
+      self:
+        'Vendor.Package:SomeOtherValidator': []
+      # validates properties of the object
+      properties:
+        price:
+          NumberRange:
+            maximum: 20
+            minimum: 10
+        customer:
+          'DigiComp.SettingValidator:Settings':
+            name: 'OrderCustomer'
 
     OrderCustomer:
-      -
-        property: firstName
-        validator: StringLength
-        options:
-          minimum: 3
-          maximum: 20
-
+      properties:
+        firstName:
+          StringLength:
+            minimum: 3
+            maximum: 20
 
 As you see: Nesting is possible ;) That way you can easily construct flexible structures.
 
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
diff --git a/Tests/Functional/SettingsValidatorTest.php b/Tests/Functional/SettingsValidatorTest.php
index c16a48b..305b515 100644
--- a/Tests/Functional/SettingsValidatorTest.php
+++ b/Tests/Functional/SettingsValidatorTest.php
@@ -7,14 +7,18 @@ use DigiComp\SettingValidator\Tests\Functional\Fixtures\TestValidationGroupsCust
 use DigiComp\SettingValidator\Tests\Functional\Fixtures\TestValidationGroupsDefaultObject;
 use DigiComp\SettingValidator\Validation\Validator\SettingsValidator;
 use Neos\Flow\Tests\FunctionalTestCase;
+use Neos\Flow\Validation\Exception\InvalidValidationConfigurationException;
+use Neos\Flow\Validation\Exception\InvalidValidationOptionsException;
+use Neos\Flow\Validation\Exception\NoSuchValidatorException;
 use Neos\Flow\Validation\ValidatorResolver;
 
 class SettingsValidatorTest extends FunctionalTestCase
 {
     /**
      * @test
+     * @throws InvalidValidationOptionsException
      */
-    public function ifNoNameIsGivenClassNameIsUsed()
+    public function ifNoNameIsGivenClassNameIsUsed(): void
     {
         $validator = $this->objectManager->get(SettingsValidator::class);
         $result = $validator->validate(new TestObject());
@@ -25,8 +29,11 @@ class SettingsValidatorTest extends FunctionalTestCase
 
     /**
      * @test
+     * @throws InvalidValidationConfigurationException
+     * @throws InvalidValidationOptionsException
+     * @throws NoSuchValidatorException
      */
-    public function conjunctionValidationWorksAsExpected()
+    public function conjunctionValidationWorksAsExpected(): void
     {
         $validatorResolver = $this->objectManager->get(ValidatorResolver::class);
         $validator = $validatorResolver->getBaseValidatorConjunction(TestObject::class);
@@ -37,8 +44,9 @@ class SettingsValidatorTest extends FunctionalTestCase
 
     /**
      * @test
+     * @throws InvalidValidationOptionsException
      */
-    public function defaultValidationGroupWorks()
+    public function defaultValidationGroupWorks(): void
     {
         $validator = $this->objectManager->get(SettingsValidator::class, ['validationGroups' => ['Default']]);
         $result = $validator->validate(new TestValidationGroupsDefaultObject());
@@ -49,8 +57,9 @@ class SettingsValidatorTest extends FunctionalTestCase
 
     /**
      * @test
+     * @throws InvalidValidationOptionsException
      */
-    public function customValidationGroupWorks()
+    public function customValidationGroupWorks(): void
     {
         $validator = $this->objectManager->get(SettingsValidator::class, ['validationGroups' => ['Custom']]);
         $result = $validator->validate(new TestValidationGroupsCustomObject());
diff --git a/composer.json b/composer.json
index 4651bb7..62b81e5 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "digicomp/settingvalidator",
-    "type": "neos-package",
     "description": "Just a Neos\\Flow Validator resolving other Validators with Configuration/Validation.yaml",
+    "type": "neos-package",
     "authors": [
         {
             "name": "Ferdinand Kuhl",
@@ -18,7 +18,8 @@
         "validation"
     ],
     "require": {
-        "neos/flow": "~4.1|^5.3"
+        "neos/flow": "^6.2.3",
+        "php": "~7.4.0"
     },
     "autoload": {
         "psr-4": {
@@ -31,9 +32,12 @@
         }
     },
     "extra": {
+        "neos": {
+            "package-key": "DigiComp.SettingValidator"
+        },
         "branch-alias": {
-            "dev-develop": "2.0.x-dev",
-            "dev-version/1.x-dev": "1.0.x-dev"
+            "dev-develop": "3.0.x-dev",
+            "dev-version/1.x-dev": "1.1.x-dev"
         },
         "applied-flow-migrations": [
             "Inwebs.Basket-201409170938",
@@ -67,7 +71,9 @@
             "Neos.Flow-20170125103800",
             "Neos.Flow-20170127183102",
             "DigiComp.SettingValidator-20170603120900",
-            "Neos.Flow-20180415105700"
+            "Neos.Flow-20180415105700",
+            "Neos.Flow-20190425144900",
+            "Neos.Flow-20190515215000"
         ]
     }
-}
\ No newline at end of file
+}