diff --git a/.cs.php b/.cs.php
index 2bba5e9..52c4c3e 100644
--- a/.cs.php
+++ b/.cs.php
@@ -19,7 +19,7 @@
             'array_syntax' => ['syntax' => 'short'],
             'cast_spaces' => ['space' => 'none'],
             'concat_space' => ['spacing' => 'one'],
-            'compact_nullable_typehint' => true,
+            'compact_nullable_type_declaration' => true,
             'declare_equal_normalize' => ['space' => 'single'],
             'general_phpdoc_annotation_remove' => [
                 'annotations' => [
@@ -36,7 +36,11 @@
             'phpdoc_order' => true, // psr-5
             'phpdoc_no_useless_inheritdoc' => false,
             'protected_to_private' => false,
-            'yoda_style' => false,
+            'yoda_style' => [
+                'equal' => false,
+                'identical' => false,
+                'less_and_greater' => false
+            ],
             'method_argument_space' => ['on_multiline' => 'ensure_fully_multiline'],
             'ordered_imports' => [
                 'sort_algorithm' => 'alpha',
diff --git a/LICENSE b/LICENSE
index bf7a9a3..bfcf021 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2023 odan
+Copyright (c) 2025 odan
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 4e9451d..0878f4f 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,6 @@
 [![Latest Version on Packagist](https://img.shields.io/github/release/selective-php/container.svg)](https://packagist.org/packages/selective/container)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg)](LICENSE)
 [![Build Status](https://github.com/selective-php/container/workflows/build/badge.svg)](https://github.com/selective-php/container/actions)
-[![Coverage Status](https://img.shields.io/scrutinizer/coverage/g/selective-php/container.svg)](https://scrutinizer-ci.com/g/selective-php/container/code-structure)
-[![Quality Score](https://img.shields.io/scrutinizer/quality/g/selective-php/container.svg)](https://scrutinizer-ci.com/g/selective-php/container/?branch=master)
 [![Total Downloads](https://img.shields.io/packagist/dt/selective/container.svg)](https://packagist.org/packages/selective/container/stats)
 
 ## Description
@@ -13,11 +11,11 @@ A PSR-11 container implementation with optional **autowiring**.
 
 ## Requirements
 
- * PHP 8.1+
+ * PHP 8.1 - 8.4
 
 ## Installation
 
-```
+```bash
 composer require selective/container
 ```
 
diff --git a/composer.json b/composer.json
index 1c3c3cb..25c0282 100644
--- a/composer.json
+++ b/composer.json
@@ -7,12 +7,12 @@
         "psr-11"
     ],
     "require": {
-        "php": "^8.1",
+        "php": "8.1.* || 8.2.* || 8.3.* || 8.4.*",
         "psr/container": "^2.0"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3",
-        "phpstan/phpstan": "^1",
+        "phpstan/phpstan": "^2",
         "phpunit/phpunit": "^10",
         "squizlabs/php_codesniffer": "^3",
         "symfony/event-dispatcher": "^5 || 6.0.*"
@@ -32,12 +32,10 @@
     },
     "scripts": {
         "cs:check": [
-            "@putenv PHP_CS_FIXER_IGNORE_ENV=1",
-            "php-cs-fixer fix --dry-run --format=txt --verbose --diff --config=.cs.php --ansi"
+            "php-cs-fixer fix --dry-run --format=txt --verbose --diff --config=.cs.php --ansi --allow-unsupported-php-version=yes"
         ],
         "cs:fix": [
-            "@putenv PHP_CS_FIXER_IGNORE_ENV=1",
-            "php-cs-fixer fix --config=.cs.php --ansi --verbose"
+            "php-cs-fixer fix --config=.cs.php --ansi --verbose --allow-unsupported-php-version=yes"
         ],
         "sniffer:check": "phpcs --standard=phpcs.xml",
         "sniffer:fix": "phpcbf --standard=phpcs.xml",
@@ -49,6 +47,9 @@
             "@stan",
             "@test"
         ],
-        "test:coverage": "php -d xdebug.mode=coverage -r \"require 'vendor/bin/phpunit';\" -- --configuration phpunit.xml --do-not-cache-result --colors=always --coverage-clover build/logs/clover.xml --coverage-html build/coverage"
+        "test:coverage": [
+            "@putenv XDEBUG_MODE=coverage",
+            "phpunit --configuration phpunit.xml --do-not-cache-result --colors=always --display-warnings --display-deprecations --coverage-clover build/coverage/clover.xml --coverage-html build/coverage --coverage-text"
+        ]
     }
 }
diff --git a/src/Exceptions/InvalidDefinitionException.php b/src/Exceptions/InvalidDefinitionException.php
index 69202ea..25a1364 100644
--- a/src/Exceptions/InvalidDefinitionException.php
+++ b/src/Exceptions/InvalidDefinitionException.php
@@ -19,7 +19,7 @@ class InvalidDefinitionException extends Exception implements ContainerException
      *
      * @return self
      */
-    public static function create(string $message, Throwable $previous = null): self
+    public static function create(string $message, ?Throwable $previous = null): self
     {
         return new self($message, 0, $previous);
     }
diff --git a/src/Resolver/ConstructorResolver.php b/src/Resolver/ConstructorResolver.php
index 81ad25e..2ffa762 100644
--- a/src/Resolver/ConstructorResolver.php
+++ b/src/Resolver/ConstructorResolver.php
@@ -78,7 +78,7 @@ public function resolve(string $id)
      *
      * @return array<mixed> The resolved parameters
      */
-    private function resolveParameters(string $id, ReflectionMethod $method = null): array
+    private function resolveParameters(string $id, ?ReflectionMethod $method = null): array
     {
         if ($method === null) {
             return [];
diff --git a/tests/TestCase/ContainerTest.php b/tests/TestCase/ContainerTest.php
index 6c9801a..f63e52c 100644
--- a/tests/TestCase/ContainerTest.php
+++ b/tests/TestCase/ContainerTest.php
@@ -12,6 +12,7 @@
 use Selective\Container\Exceptions\InvalidDefinitionException;
 use Selective\Container\Exceptions\NotFoundException;
 use Selective\Container\Resolver\ConstructorResolver;
+use Selective\Container\Resolver\DefinitionResolverInterface;
 use Selective\Container\Test\TestCase\Service\MyAbstractService;
 use Selective\Container\Test\TestCase\Service\MyService;
 use Selective\Container\Test\TestCase\Service\MyServiceA;
@@ -290,16 +291,7 @@ public function testAutowireWithInvalidInternalClass(): void
         $container = new Container();
         $container->addResolver(new ConstructorResolver($container));
 
-        // https://3v4l.org/1AXpr
-        if (version_compare(PHP_VERSION, '8.0.0') >= 0) {
-            // PHP 8+
-            $this->assertInstanceOf(Exception::class, $container->get(Exception::class));
-        } else {
-            // PHP 7.x
-            // Cannot determine default value for internal functions
-            $this->expectException(InvalidDefinitionException::class);
-            $container->get(Exception::class);
-        }
+        $this->assertInstanceOf(Exception::class, $container->get(Exception::class));
     }
 
     /**
@@ -312,15 +304,7 @@ public function testAutowireWithInvalidInternalInterface(): void
         $container = new Container();
         $container->addResolver(new ConstructorResolver($container));
 
-        if (version_compare(PHP_VERSION, '8.0.0') >= 0) {
-            // PHP 8+
-            $this->assertInstanceOf(NotFoundException::class, $container->get(NotFoundException::class));
-        } else {
-            // PHP 7.x
-            // Cannot determine default value for internal functions
-            $this->expectException(InvalidDefinitionException::class);
-            $container->get(NotFoundException::class);
-        }
+        $this->assertInstanceOf(NotFoundException::class, $container->get(NotFoundException::class));
     }
 
     /**
@@ -353,4 +337,25 @@ public function testAutowireWithNotExistingClass(): void
         $container->addResolver(new ConstructorResolver($container));
         $container->get('Nada\Foo');
     }
+
+    /**
+     * Test.
+     *
+     * @return void
+     */
+    public function testAutowireReturnsNull(): void
+    {
+        $container = new Container();
+
+        $resolver = $this->createMock(DefinitionResolverInterface::class);
+        $resolver->method('isResolvable')->willReturn(false);
+        $resolver->expects($this->once())
+            ->method('resolve')
+            ->with(stdClass::class)
+            ->willReturn(null);
+
+        $container->addResolver($resolver);
+
+        $this->assertNull($container->get(stdClass::class));
+    }
 }
diff --git a/tests/TestCase/Resolver/ConstructorResolverTest.php b/tests/TestCase/Resolver/ConstructorResolverTest.php
index 33279a9..f6a3fd4 100644
--- a/tests/TestCase/Resolver/ConstructorResolverTest.php
+++ b/tests/TestCase/Resolver/ConstructorResolverTest.php
@@ -3,12 +3,19 @@
 namespace Selective\Container\Test\Resolver\TestCase;
 
 use PHPUnit\Framework\TestCase;
+use ReflectionMethod;
 use Selective\Container\Container;
 use Selective\Container\Exceptions\InvalidDefinitionException;
 use Selective\Container\Resolver\ConstructorResolver;
+use stdClass;
 
 final class ConstructorResolverTest extends TestCase
 {
+    /**
+     * Test.
+     *
+     * @return void
+     */
     public function testResolveOnInvalidDefinition(): void
     {
         $this->expectException(InvalidDefinitionException::class);
@@ -19,4 +26,25 @@ public function testResolveOnInvalidDefinition(): void
         $constructorResolver = new ConstructorResolver($container);
         $constructorResolver->resolve($invalidId);
     }
+
+    /**
+     * Resolve parameters returns empty array when method is null.
+     *
+     * @return void
+     */
+    public function testResolveParametersReturnsEmptyArrayWhenMethodIsNull(): void
+    {
+        $container = new Container();
+        $resolver = new ConstructorResolver($container);
+
+        $ref = new ReflectionMethod(
+            ConstructorResolver::class,
+            'resolveParameters'
+        );
+        $ref->setAccessible(true);
+
+        $result = $ref->invoke($resolver, stdClass::class, null);
+
+        $this->assertSame([], $result);
+    }
 }