diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index f7e40cd..35e1981 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -28,21 +28,22 @@
             '@all'
         ]
     ],
-    'no_php4_constructor'                   => true,
-    'no_superfluous_phpdoc_tags'            => false,
-    'no_unreachable_default_argument_value' => true,
-    'no_useless_else'                       => true,
-    'no_useless_return'                     => true,
-    'ordered_imports'                       => true,
-    'php_unit_strict'                       => true,
-    'phpdoc_order'                          => true,
-    'semicolon_after_instruction'           => true,
-    'single_import_per_statement'           => false,
-    'strict_comparison'                     => true,
-    'strict_param'                          => true,
-    'single_line_throw'                     => false,
-    'trailing_comma_in_multiline'           => false,
-    'yoda_style'                            => [
+    'no_php4_constructor'                              => true,
+    'no_superfluous_phpdoc_tags'                       => false,
+    'no_unreachable_default_argument_value'            => true,
+    'no_useless_else'                                  => true,
+    'no_useless_return'                                => true,
+    'nullable_type_declaration_for_default_null_value' => true,
+    'ordered_imports'                                  => true,
+    'php_unit_strict'                                  => true,
+    'phpdoc_order'                                     => true,
+    'semicolon_after_instruction'                      => true,
+    'single_import_per_statement'                      => false,
+    'strict_comparison'                                => true,
+    'strict_param'                                     => true,
+    'single_line_throw'                                => false,
+    'trailing_comma_in_multiline'                      => false,
+    'yoda_style'                                       => [
         'equal'            => false,
         'identical'        => false,
         'less_and_greater' => false