diff --git a/composer.json b/composer.json
index 322d464..840775d 100644
--- a/composer.json
+++ b/composer.json
@@ -10,12 +10,12 @@
 			"email": "sascha.ternes@gmx.de"
 		}
 	],
-	"version": "1.10.1",
-	"time": "2023-05-31",
+	"version": "1.11.0",
+	"time": "2024-02-03",
 
 	"require": {
-		"php": "~8.1",
-		"phpunit/phpunit": "~10.0"
+		"php": "~8.2",
+		"phpunit/phpunit": "~11.0"
 	},
 
 	"autoload": {
diff --git a/src/Assertions.php b/src/Assertions.php
index 6c2e798..fdfc584 100644
--- a/src/Assertions.php
+++ b/src/Assertions.php
@@ -8,17 +8,15 @@ trait Assertions
 {
 	/**
 	 * Assert that the actual value is an array containing an exact number of elements that may have a defined type.
-	 *
-	 * @param mixed $actual
 	 */
-	public static function assertArray($actual, int $count = 0, ?string $type = null, string $message = ''): void {
+	public static function assertArray(mixed $actual, int $count = 0, ?string $type = null, string $message = ''): void {
 		Assert::assertIsArray($actual, $message);
 		$message = $message ?? 'Expected array of ' . $count . ' elements.';
 		Assert::assertSame($count, count($actual), $message);
 		if ($type) {
 			if ($type === 'stdClass') {
 				Assert::assertContainsOnlyInstancesOf($type, $actual);
-			} elseif (strpos($type, '\\') !== false) {
+			} elseif (str_contains($type, '\\')) {
 				Assert::assertContainsOnlyInstancesOf($type, $actual);
 			} else {
 				Assert::assertContainsOnly($type, $actual, true);
@@ -28,12 +26,8 @@ public static function assertArray($actual, int $count = 0, ?string $type = null
 
 	/**
 	 * Assert that array has key and value.
-	 *
-	 * @param mixed $actual
-	 * @param mixed $key
-	 * @param mixed $value
 	 */
-	public static function assertArrayKey($actual, $key, $value, string $message = ''): void {
+	public static function assertArrayKey(mixed $actual, mixed $key, mixed $value, string $message = ''): void {
 		Assert::assertIsArray($actual, $message);
 		Assert::assertArrayHasKey($key, $actual, $message);
 		$actualValue = $actual[$key];
@@ -43,11 +37,8 @@ public static function assertArrayKey($actual, $key, $value, string $message = '
 
 	/**
 	 * Assert that a value is an integer greater than zero and a whole-number power of two.
-	 *
-	 * @param mixed $value
 	 */
-	protected function assertIsPowerOfTwo($value): void
-	{
+	protected function assertIsPowerOfTwo(mixed $value): void {
 		$this->assertIsInt($value);
 		$this->assertGreaterThan(0, $value);
 		if ($value === 1) {
@@ -62,11 +53,8 @@ protected function assertIsPowerOfTwo($value): void
 
 	/**
 	 * Assert that an object has a method.
-	 *
-	 * @param mixed $object
 	 */
-	protected function assertObjectHasMethod(string $method, $object): void
-	{
+	protected function assertObjectHasMethod(string $method, mixed $object): void {
 		Assert::assertMatchesRegularExpression('/^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$/', $method, 'The method name "' . $method . '" is invalid.');
 		Assert::assertIsObject($object);
 		$reflection = new \ReflectionClass($object);
diff --git a/src/Functions.php b/src/Functions.php
index 45aa2a8..a77ea84 100644
--- a/src/Functions.php
+++ b/src/Functions.php
@@ -4,10 +4,8 @@
 
 /**
  * Return the class name of an object without its namespace.
- *
- * @param object|string $object
  */
-function getClass($object): string {
+function getClass(object|string $object): string {
 	$class = is_object($object) ? get_class($object) : $object;
 	$i     = strrpos($class, '\\');
 	return $i > 0 ? substr($class, $i + 1) : $class;
diff --git a/tests/Assertions/AssertArrayKeyTest.php b/tests/Assertions/AssertArrayKeyTest.php
index d4a74ec..9c07849 100644
--- a/tests/Assertions/AssertArrayKeyTest.php
+++ b/tests/Assertions/AssertArrayKeyTest.php
@@ -2,6 +2,7 @@
 declare(strict_types = 1);
 namespace SATHub\PHPUnit\Tests\Assertions;
 
+use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 
@@ -17,45 +18,32 @@ class AssertArrayKeyTest extends TestCase
 
 	private const STRING = 'value';
 
-	/**
-	 * @test
-	 */
+	#[Test]
 	public function assertArrayKeySucceeds(): void {
 		$this->assertArrayKey([self::KEY => self::INT], self::KEY, self::INT);
 	}
 
-	/**
-	 * @test
-	 */
+	#[Test]
 	public function assertArrayKeyIgnoresAdditionalKeys(): void {
 		$this->assertArrayKey([self::KEY => self::INT, 'key2' => self::STRING], self::KEY, self::INT);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayKeyWithEmptyArray(): void
-	{
+	#[Test]
+	public function assertArrayKeyWithEmptyArray(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertArrayKey([], 'key', null);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayKeyFailsIfValueIsDifferent(): void
-	{
+	#[Test]
+	public function assertArrayKeyFailsIfValueIsDifferent(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertArrayKey([self::KEY => self::INT], self::KEY, self::STRING);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayKeyFailsIfKeyIsMissing(): void
-	{
+	#[Test]
+	public function assertArrayKeyFailsIfKeyIsMissing(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertArrayKey([self::KEY => self::INT], 'key2', self::INT);
diff --git a/tests/Assertions/AssertArrayTest.php b/tests/Assertions/AssertArrayTest.php
index 5d4c05b..05279b0 100644
--- a/tests/Assertions/AssertArrayTest.php
+++ b/tests/Assertions/AssertArrayTest.php
@@ -2,6 +2,7 @@
 declare(strict_types = 1);
 namespace SATHub\PHPUnit\Tests\Assertions;
 
+use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 
@@ -13,79 +14,52 @@ class AssertArrayTest extends TestCase
 {
 	use Assertions;
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithEmptyArray(): void
-	{
+	#[Test]
+	public function assertArrayWithEmptyArray(): void {
 		$this->assertArray([]);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfIntegers(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfIntegers(): void {
 		$this->assertArray([735, -2673], 2, 'int');
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertCountParameterIsRequired(): void
-	{
+	#[Test]
+	public function assertCountParameterIsRequired(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertArray([735, -2673]);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfStrings(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfStrings(): void {
 		$this->assertArray(['735', '', __CLASS__], 3, 'string');
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfObjects(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfObjects(): void {
 		$this->assertArray([new \stdClass(), $this, new Mock()], 3, 'object');
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfClassInstances(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfClassInstances(): void {
 		$this->assertArray([new Mock(), new Mock()], 2, Mock::class);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfMixedClasses(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfMixedClasses(): void {
 		$this->assertArray([new Mock(), new \stdClass()], 2);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfMixedClassesFails(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfMixedClassesFails(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertArray([new Mock(), new \stdClass()], 2, Mock::class);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertArrayWithArrayOfStdClass(): void
-	{
+	#[Test]
+	public function assertArrayWithArrayOfStdClass(): void {
 		$this->assertArray([new \stdClass()], 1, \stdClass::class);
 		$this->assertArray([new \stdClass()], 1, 'stdClass');
 		$this->assertArray([new \stdClass()], 1, '\\stdClass');
diff --git a/tests/Assertions/AssertIsPowerOfTwoTest.php b/tests/Assertions/AssertIsPowerOfTwoTest.php
index 7ff7a24..a75613b 100644
--- a/tests/Assertions/AssertIsPowerOfTwoTest.php
+++ b/tests/Assertions/AssertIsPowerOfTwoTest.php
@@ -2,6 +2,7 @@
 declare(strict_types = 1);
 namespace SATHub\PHPUnit\Tests\Assertions;
 
+use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 
@@ -11,11 +12,8 @@ class AssertIsPowerOfTwoTest extends TestCase
 {
 	use Assertions;
 
-	/**
-	 * @test
-	 */
-	public function assertIsPowerOfTwoSucceeds(): void
-	{
+	#[Test]
+	public function assertIsPowerOfTwoSucceeds(): void {
 		$this->assertIsPowerOfTwo(1);
 		$this->assertIsPowerOfTwo(2);
 		$this->assertIsPowerOfTwo(8);
@@ -23,41 +21,29 @@ public function assertIsPowerOfTwoSucceeds(): void
 		$this->assertIsPowerOfTwo(65536 * 65536 * 65536);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertIsPowerOfTwoForZero(): void
-	{
+	#[Test]
+	public function assertIsPowerOfTwoForZero(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertIsPowerOfTwo(0);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertIsPowerOfTwoForNegativeValue(): void
-	{
+	#[Test]
+	public function assertIsPowerOfTwoForNegativeValue(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertIsPowerOfTwo(-4);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertIsPowerOfTwoFailsForFloat(): void
-	{
+	#[Test]
+	public function assertIsPowerOfTwoFailsForFloat(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertIsPowerOfTwo(4.0);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertIsPowerOfTwoFailsForString(): void
-	{
+	#[Test]
+	public function assertIsPowerOfTwoFailsForString(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertIsPowerOfTwo('4');
diff --git a/tests/Assertions/AssertObjectHasMethodTest.php b/tests/Assertions/AssertObjectHasMethodTest.php
index 9ba2e19..2895322 100644
--- a/tests/Assertions/AssertObjectHasMethodTest.php
+++ b/tests/Assertions/AssertObjectHasMethodTest.php
@@ -2,6 +2,7 @@
 declare(strict_types = 1);
 namespace SATHub\PHPUnit\Tests\Assertions;
 
+use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 
@@ -11,39 +12,27 @@ class AssertObjectHasMethodTest extends TestCase
 {
 	use Assertions;
 
-	/**
-	 * @test
-	 */
-	public function assertObjectHasMethodSucceeds(): void
-	{
+	#[Test]
+	public function assertObjectHasMethodSucceeds(): void {
 		$this->assertObjectHasMethod(__FUNCTION__, $this);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertObjectHasMethodFailsIfMethodDoesNotExist(): void
-	{
+	#[Test]
+	public function assertObjectHasMethodFailsIfMethodDoesNotExist(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertObjectHasMethod('nonExistingMethod', $this);
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertObjectHasMethodFailsForNonObject(): void
-	{
+	#[Test]
+	public function assertObjectHasMethodFailsForNonObject(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertObjectHasMethod('toString', 'string');
 	}
 
-	/**
-	 * @test
-	 */
-	public function assertObjectHasMethodFailsForInvalidMethodName(): void
-	{
+	#[Test]
+	public function assertObjectHasMethodFailsForInvalidMethodName(): void {
 		$this->expectException(ExpectationFailedException::class);
 
 		$this->assertObjectHasMethod('I-am-!nvalid', $this);
diff --git a/tests/Assertions/PassTest.php b/tests/Assertions/PassTest.php
index e4c7e0f..0d438eb 100644
--- a/tests/Assertions/PassTest.php
+++ b/tests/Assertions/PassTest.php
@@ -12,8 +12,7 @@ class PassTest extends TestCase
 	use Assertions;
 
 	#[Test]
-	public function passSucceeds(): void
-	{
+	public function passSucceeds(): void {
 		$this->pass();
 	}
 }
diff --git a/tests/Functions/GetClassTest.php b/tests/Functions/GetClassTest.php
index 290d216..ba5e497 100644
--- a/tests/Functions/GetClassTest.php
+++ b/tests/Functions/GetClassTest.php
@@ -2,20 +2,18 @@
 declare(strict_types = 1);
 namespace SATHub\PHPUnit\Tests\Functions;
 
+use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 
 use function SATHub\PHPUnit\getClass;
 
 class GetClassTest extends TestCase
 {
-	protected function setUp(): void
-	{
+	protected function setUp(): void {
 		require_once __DIR__ . '/../../src/Functions.php';
 	}
 
-	/**
-	 * @test
-	 */
+	#[Test]
 	public function getClassReturnsCorrectClassName(): void {
 		$this->assertSame('GetClassTest', getClass($this));
 	}