diff --git a/config/set/php-cs-fixer-custom.php b/config/set/php-cs-fixer-custom.php
index e20d9be..f3794ad 100644
--- a/config/set/php-cs-fixer-custom.php
+++ b/config/set/php-cs-fixer-custom.php
@@ -34,7 +34,9 @@
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\NoSuperfluousElseifFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\NoUselessElseFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\Strict\StrictComparisonFixer::class);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ArrayNotation\ArraySyntaxFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\FunctionNotation\ImplodeCallFixer::class);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
diff --git a/config/set/php-cs-fixer/per-cs.php b/config/set/php-cs-fixer/per-cs.php
index 84392e8..4168a4d 100644
--- a/config/set/php-cs-fixer/per-cs.php
+++ b/config/set/php-cs-fixer/per-cs.php
@@ -16,7 +16,9 @@
     ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\Whitespace\IndentationTypeFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\ElseifFixer::class);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
         'inline_constructor_arguments' => false,
         'space_before_parenthesis' => true,
diff --git a/config/set/php-cs-fixer/per-cs20.php b/config/set/php-cs-fixer/per-cs20.php
index eaaa23a..f3f8482 100644
--- a/config/set/php-cs-fixer/per-cs20.php
+++ b/config/set/php-cs-fixer/per-cs20.php
@@ -16,7 +16,9 @@
     ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\Whitespace\IndentationTypeFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\ElseifFixer::class);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
         'inline_constructor_arguments' => false,
         'space_before_parenthesis' => true,
diff --git a/config/set/php-cs-fixer/per.php b/config/set/php-cs-fixer/per.php
index 84392e8..4168a4d 100644
--- a/config/set/php-cs-fixer/per.php
+++ b/config/set/php-cs-fixer/per.php
@@ -16,7 +16,9 @@
     ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\Whitespace\IndentationTypeFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\ElseifFixer::class);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
         'inline_constructor_arguments' => false,
         'space_before_parenthesis' => true,
diff --git a/config/set/php-cs-fixer/php-cs-fixer.php b/config/set/php-cs-fixer/php-cs-fixer.php
index 9c61051..e81cdfe 100644
--- a/config/set/php-cs-fixer/php-cs-fixer.php
+++ b/config/set/php-cs-fixer/php-cs-fixer.php
@@ -28,7 +28,9 @@
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\EmptyLoopBodyFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\NoSuperfluousElseifFixer::class);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ControlStructure\NoUselessElseFixer::class);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ArrayNotation\ArraySyntaxFixer::class);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
         'single_line' => true,
diff --git a/config/set/php-cs-fixer/phpunit100-migration-risky.php b/config/set/php-cs-fixer/phpunit100-migration-risky.php
index b89c5a1..cf29ef7 100644
--- a/config/set/php-cs-fixer/phpunit100-migration-risky.php
+++ b/config/set/php-cs-fixer/phpunit100-migration-risky.php
@@ -23,6 +23,7 @@
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertFixer::class, [
         'target' => '5.6',
     ]);
+    $ecsConfig->rule(\PhpCsFixer\Fixer\PhpUnit\PhpUnitAssertNewNamesFixer::class);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertInternalTypeFixer::class, [
         'target' => '7.5',
     ]);
diff --git a/config/set/php-cs-fixer/phpunit91-migration-risky.php b/config/set/php-cs-fixer/phpunit91-migration-risky.php
new file mode 100644
index 0000000..2742549
--- /dev/null
+++ b/config/set/php-cs-fixer/phpunit91-migration-risky.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+use Symplify\EasyCodingStandard\Config\ECSConfig;
+
+return static function (ECSConfig $ecsConfig): void {
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitNoExpectationAnnotationFixer::class, [
+        'target' => '4.3',
+    ]);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitExpectationFixer::class, [
+        'target' => '8.4',
+    ]);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitNamespacedFixer::class, [
+        'target' => '6.0',
+    ]);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitMockFixer::class, [
+        'target' => '5.5',
+    ]);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertFixer::class, [
+        'target' => '5.6',
+    ]);
+    $ecsConfig->rule(\PhpCsFixer\Fixer\PhpUnit\PhpUnitAssertNewNamesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertInternalTypeFixer::class, [
+        'target' => '7.5',
+    ]);
+};
diff --git a/config/set/php-cs-fixer/symfony.php b/config/set/php-cs-fixer/symfony.php
index deb4119..30d2514 100644
--- a/config/set/php-cs-fixer/symfony.php
+++ b/config/set/php-cs-fixer/symfony.php
@@ -28,7 +28,9 @@
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ControlStructure\EmptyLoopBodyFixer::class, [
         'style' => 'braces',
     ]);
-    $ecsConfig->rule(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class);
+    $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\Operator\NewWithParenthesesFixer::class, [
+        'anonymous_class' => false,
+    ]);
     $ecsConfig->rule(\PhpCsFixer\Fixer\ArrayNotation\ArraySyntaxFixer::class);
     $ecsConfig->ruleWithConfiguration(\PhpCsFixer\Fixer\ClassNotation\ClassDefinitionFixer::class, [
         'single_line' => true,
diff --git a/correct/TestClass.php b/correct/TestClass.php
index 287711b..a5042ad 100644
--- a/correct/TestClass.php
+++ b/correct/TestClass.php
@@ -29,8 +29,6 @@ class TestClass implements TestableContract
     public $bar;
 
     /**
-     * TestClass constructor.
-     *
      * @param \Zing\CodingStandard\Correct\Foo $foo the first param
      * @param \Zing\CodingStandard\Correct\Bar $bar the second param
      */
diff --git a/src/PHPCodeSnifferRuleSetGenerator.php b/src/PHPCodeSnifferRuleSetGenerator.php
index 2e56f32..c6c8f10 100644
--- a/src/PHPCodeSnifferRuleSetGenerator.php
+++ b/src/PHPCodeSnifferRuleSetGenerator.php
@@ -46,7 +46,7 @@ public function generate(): void
             $ruleset->registerSniffs($sniffs, [], []);
 
             file_put_contents(
-                sprintf(__DIR__ . '/../config/set/php_codesniffer/%s', self::MAP[$setDefinition->getRelativePath()]),
+                \sprintf(__DIR__ . '/../config/set/php_codesniffer/%s', self::MAP[$setDefinition->getRelativePath()]),
                 $this->ruleSetPrinter->print($this->formatRulesToServices($ruleset))
             );
         }
diff --git a/src/PhpCsFixerRuleSetGenerator.php b/src/PhpCsFixerRuleSetGenerator.php
index cbbfebe..5e46f54 100644
--- a/src/PhpCsFixerRuleSetGenerator.php
+++ b/src/PhpCsFixerRuleSetGenerator.php
@@ -47,6 +47,7 @@ final class PhpCsFixerRuleSetGenerator
         '@PHPUnit60Migration:risky' => 'phpunit60-migration-risky.php',
         '@PHPUnit75Migration:risky' => 'phpunit75-migration-risky.php',
         '@PHPUnit84Migration:risky' => 'phpunit84-migration-risky.php',
+        '@PHPUnit91Migration:risky' => 'phpunit91-migration-risky.php',
         '@PHPUnit100Migration:risky' => 'phpunit100-migration-risky.php',
         '@PER' => 'per.php',
         '@PER:risky' => 'per-risky.php',
@@ -79,7 +80,7 @@ public function generate(): void
             $fixerFactory = new FixerFactory();
             $fixerFactory->registerBuiltInFixers();
             file_put_contents(
-                sprintf(__DIR__ . '/../config/set/php-cs-fixer/%s', self::MAP[$setDefinition->getName()]),
+                \sprintf(__DIR__ . '/../config/set/php-cs-fixer/%s', self::MAP[$setDefinition->getName()]),
                 $this->ruleSetPrinter->print($this->formatRulesToServices($fixerFactory, $setDefinition))
             );
         }