diff --git a/ci/php-cs-fixer.php b/ci/php-cs-fixer.php
index 4c22b4a4..3731376c 100644
--- a/ci/php-cs-fixer.php
+++ b/ci/php-cs-fixer.php
@@ -28,7 +28,7 @@
     'final_internal_class'        => true,
     'linebreak_after_opening_tag' => true,
     'list_syntax'                 => ['syntax' => 'short'],
-    //'mb_str_functions'            => true,
+    'mb_str_functions'            => true,
     'method_argument_space' => [
         'keep_multiple_spaces_after_comma' => false,
         'on_multiline'                     => 'ensure_fully_multiline',
@@ -50,6 +50,8 @@
     'simplified_null_return'      => true,
     'strict_comparison'           => true,
     'strict_param'                => true,
+    //enable when min php >= 8.0
+    'get_class_to_class_keyword'  => false,
 ];
 
 return (new PhpCsFixer\Config())
diff --git a/src/Statement/Builder/StatementBuilderFactory.php b/src/Statement/Builder/StatementBuilderFactory.php
index b664a24a..05ebe461 100644
--- a/src/Statement/Builder/StatementBuilderFactory.php
+++ b/src/Statement/Builder/StatementBuilderFactory.php
@@ -25,10 +25,10 @@ public function create(string $classname): StatementBuilder
     {
         if (is_a($classname, RelationAssertion::class, true)) {
             $statementBuilder = sprintf('%s\\RelationStatementBuilder', __NAMESPACE__);
-            $rules = array_filter($this->rules, static fn ($rule) => is_a($rule, RelationRule::class, true));
+            $rules            = array_filter($this->rules, static fn ($rule) => is_a($rule, RelationRule::class, true));
         } elseif (is_a($classname, DeclarationAssertion::class, true)) {
             $statementBuilder = sprintf('%s\\DeclarationStatementBuilder', __NAMESPACE__);
-            $rules = array_filter($this->rules, static fn ($rule) => is_a($rule, RelationRule::class, true));
+            $rules            = array_filter($this->rules, static fn ($rule) => is_a($rule, RelationRule::class, true));
         } else {
             throw new InvalidArgumentException(sprintf('"%s" is not a valid statement builder', $classname));
         }