diff --git a/composer.json b/composer.json
index 1ec3b56..ac4cd85 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
 		"php": ">=8.1"
 	},
 	"require-dev": {
-		"phpunit/phpunit": ">=10.0",
+		"phpunit/phpunit": "^10.0",
 		"nikic/php-fuzzer": "*",
 		"s9e/repdoc": "dev-wip"
 	},
diff --git a/tests/BencodeTest.php b/tests/BencodeTest.php
index fd565fd..0ac3f5f 100644
--- a/tests/BencodeTest.php
+++ b/tests/BencodeTest.php
@@ -3,12 +3,11 @@
 namespace s9e\Bencode\Tests;
 
 use ArrayObject;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 use s9e\Bencode\Bencode;
 
-/**
-* @covers s9e\Bencode\Bencode
-*/
+#[CoversClass(Bencode::class)]
 class BencodeTest extends TestCase
 {
 	public function testDecode()
diff --git a/tests/DecoderTest.php b/tests/DecoderTest.php
index a27f8bb..8447aad 100644
--- a/tests/DecoderTest.php
+++ b/tests/DecoderTest.php
@@ -3,16 +3,16 @@
 namespace s9e\Bencode\Tests;
 
 use ArrayObject;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
 use TypeError;
 use s9e\Bencode\Decoder;
 use s9e\Bencode\Exceptions\ComplianceError;
 use s9e\Bencode\Exceptions\DecodingException;
 
-/**
-* @covers s9e\Bencode\Decoder
-*/
+#[CoversClass(Decoder::class)]
 class DecoderTest extends TestCase
 {
 	use NonCompliantTestProvider;
@@ -23,9 +23,7 @@ public static function setUpBeforeClass(): void
 		Decoder::decode('i1e');
 	}
 
-	/**
-	* @group memory
-	*/
+	#[Group('memory')]
 	public function testMemoryList()
 	{
 		if (is_callable('memory_reset_peak_usage'))
@@ -59,9 +57,7 @@ public function testMemoryList()
 		$this->assertLessThan(4096, $delta);
 	}
 
-	/**
-	* @group memory
-	*/
+	#[Group('memory')]
 	public function testMemoryString()
 	{
 		if (is_callable('memory_reset_peak_usage'))
@@ -417,6 +413,10 @@ public static function getDecodeInvalidTests()
 				'ld1',
 				new DecodingException('Premature end of data', 2)
 			],
+			[
+				'l-3:e',
+				new DecodingException('Illegal character', 1)
+			],
 		];
 	}
 
diff --git a/tests/EncoderTest.php b/tests/EncoderTest.php
index a2c7e97..daf8bd5 100644
--- a/tests/EncoderTest.php
+++ b/tests/EncoderTest.php
@@ -4,6 +4,7 @@
 
 use ArrayObject;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 use TypeError;
 use s9e\Bencode\BencodeSerializable;
@@ -11,9 +12,7 @@
 use s9e\Bencode\Exceptions\EncodingException;
 use stdClass;
 
-/**
-* @covers s9e\Bencode\Encoder
-*/
+#[CoversClass(Encoder::class)]
 class EncoderTest extends TestCase
 {
 	#[DataProvider('getEncodeTests')]
diff --git a/tests/Exceptions/DecodingExceptionTest.php b/tests/Exceptions/DecodingExceptionTest.php
index 8f14769..6374f3c 100644
--- a/tests/Exceptions/DecodingExceptionTest.php
+++ b/tests/Exceptions/DecodingExceptionTest.php
@@ -1,13 +1,7 @@
 <?php declare(strict_types=1);
 
-/**
-* @package   s9e\Bencode
-* @copyright Copyright (c) The s9e authors
-* @license   http://www.opensource.org/licenses/mit-license.php The MIT License
-*/
 namespace s9e\Bencode\Tests\Exceptions;
 
-
 use PHPUnit\Framework\TestCase;
 use TypeError;
 use s9e\Bencode\Exceptions\DecodingException;
diff --git a/tests/Exceptions/EncodingExceptionTest.php b/tests/Exceptions/EncodingExceptionTest.php
index 9022161..550fbc0 100644
--- a/tests/Exceptions/EncodingExceptionTest.php
+++ b/tests/Exceptions/EncodingExceptionTest.php
@@ -1,10 +1,5 @@
 <?php declare(strict_types=1);
 
-/**
-* @package   s9e\Bencode
-* @copyright Copyright (c) The s9e authors
-* @license   http://www.opensource.org/licenses/mit-license.php The MIT License
-*/
 namespace s9e\Bencode\Tests\Exceptions;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/NonCompliantDecoderTest.php b/tests/NonCompliantDecoderTest.php
index 3122cee..db533bb 100644
--- a/tests/NonCompliantDecoderTest.php
+++ b/tests/NonCompliantDecoderTest.php
@@ -3,15 +3,15 @@
 namespace s9e\Bencode\Tests;
 
 use ArrayObject;
+use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use s9e\Bencode\Decoder;
 use s9e\Bencode\Exceptions\DecodingException;
 use s9e\Bencode\NonCompliantDecoder;
 
-/**
-* @covers s9e\Bencode\Decoder
-* @covers s9e\Bencode\NonCompliantDecoder
-*/
+#[CoversClass(Decoder::class)]
+#[CoversClass(NonCompliantDecoder::class)]
 class NonCompliantDecoderTest extends TestCase
 {
 	use NonCompliantTestProvider;