diff -up ./phpunit.rpm ./phpunit
--- ./phpunit.rpm	2024-10-28 16:44:45.000000000 +0100
+++ ./phpunit	2024-10-28 16:48:36.313661416 +0100
@@ -46,27 +46,13 @@ if (isset($GLOBALS['_composer_autoload_p
     define('PHPUNIT_COMPOSER_INSTALL', $GLOBALS['_composer_autoload_path']);
 
     unset($GLOBALS['_composer_autoload_path']);
-} else {
-    foreach (array(__DIR__ . '/../../autoload.php', __DIR__ . '/../vendor/autoload.php', __DIR__ . '/vendor/autoload.php') as $file) {
-        if (file_exists($file)) {
-            define('PHPUNIT_COMPOSER_INSTALL', $file);
-
-            break;
-        }
-    }
 
-    unset($file);
-}
-
-if (!defined('PHPUNIT_COMPOSER_INSTALL')) {
-    fwrite(
-        STDERR,
-        'You need to set up the project dependencies using Composer:' . PHP_EOL . PHP_EOL .
-        '    composer install' . PHP_EOL . PHP_EOL .
-        'You can learn all about Composer on https://getcomposer.org/.' . PHP_EOL
-    );
+} else if (file_exists('./vendor/phpunit/phpunit/phpunit') && file_exists('./vendor/autoload.php')) {
+    echo "\n==== Redirecting to composer installed version in vendor/phpunit ====\n\n";
+    define ('PHPUNIT_COMPOSER_INSTALL', realpath('./vendor/autoload.php'));
 
-    die(1);
+} else {
+    define ('PHPUNIT_COMPOSER_INSTALL', '/usr/share/php/PHPUnit10/autoload.php');
 }
 
 require PHPUNIT_COMPOSER_INSTALL;
@@ -101,4 +87,13 @@ if ([] !== $unavailableExtensions) {
 
 unset($requiredExtensions, $unavailableExtensions);
 
-exit((new PHPUnit\TextUI\Application)->run($_SERVER['argv']));
+if (class_exists('PHPUnit\\TextUI\\Application')) {
+    // PHPUnit v10 or newer
+    exit((new PHPUnit\TextUI\Application)->run($_SERVER['argv']));
+} else if (class_exists('PHPUnit_TextUI_Command')) {
+    // PHPUnit v5 or older
+    PHPUnit_TextUI_Command::main();
+} else {
+    // PHPUnit v6 to v9
+    PHPUnit\TextUI\Command::main();
+}
diff -up ./src/TextUI/Command/Commands/VersionCheckCommand.php.rpm ./src/TextUI/Command/Commands/VersionCheckCommand.php
--- ./src/TextUI/Command/Commands/VersionCheckCommand.php.rpm	2024-10-28 16:44:45.000000000 +0100
+++ ./src/TextUI/Command/Commands/VersionCheckCommand.php	2024-10-28 17:08:20.070934441 +0100
@@ -39,7 +39,7 @@ final class VersionCheckCommand implemen
 
         assert($latestVersion !== false);
 
-        $latestCompatibleVersion = $this->downloader->download('https://phar.phpunit.de/latest-version-of/phpunit-' . $this->majorVersionNumber);
+        $latestCompatibleVersion = $this->downloader->download('https://phar.phpunit.de/latest-version-of/phpunit-' . $major=$this->majorVersionNumber);
 
         assert($latestCompatibleVersion !== false);
 
@@ -48,11 +48,11 @@ final class VersionCheckCommand implemen
 
         if (!$notLatest && !$notLatestCompatible) {
             return Result::from(
-                'You are using the latest version of PHPUnit.' . PHP_EOL,
+                'You are using the latest version of PHPUnit.' . PHP_EOL . PHP_EOL,
             );
         }
 
-        $buffer = 'You are not using the latest version of PHPUnit.' . PHP_EOL;
+        $buffer = 'You are not using the latest version of PHPUnit.' . PHP_EOL . PHP_EOL;
 
         if ($notLatestCompatible) {
             $buffer .= sprintf(
@@ -60,6 +60,7 @@ final class VersionCheckCommand implemen
                 $this->versionId,
                 $latestCompatibleVersion,
             );
+            $buffer .= sprintf('Try a system update for new phpunit%s package.' . PHP_EOL . PHP_EOL, $major);
         }
 
         if ($notLatest) {
@@ -67,6 +68,9 @@ final class VersionCheckCommand implemen
                 'The latest version is PHPUnit %s.' . PHP_EOL,
                 $latestVersion,
             );
+            if ($major !== ($new = (int)explode('.', $latestVersion)[0])) {
+                $buffer .= sprintf('Try to install and use the phpunit%s command.' . PHP_EOL . PHP_EOL, explode('.', $latestVersion)[0]);
+            }
         }
 
         return Result::from($buffer);
diff -up ./src/TextUI/Configuration/Xml/SchemaFinder.php.rpm ./src/TextUI/Configuration/Xml/SchemaFinder.php
--- ./src/TextUI/Configuration/Xml/SchemaFinder.php.rpm	2024-10-28 16:44:45.000000000 +0100
+++ ./src/TextUI/Configuration/Xml/SchemaFinder.php	2024-10-28 16:48:35.645635304 +0100
@@ -77,6 +77,6 @@ final class SchemaFinder
             return __PHPUNIT_PHAR_ROOT__ . '/';
         }
 
-        return __DIR__ . '/../../../../';
+        return __DIR__ . '/../../../';
     }
 }
diff -up ./tests/bootstrap.php.rpm ./tests/bootstrap.php
--- ./tests/bootstrap.php.rpm	2024-10-28 16:44:45.000000000 +0100
+++ ./tests/bootstrap.php	2024-10-28 16:48:36.312661377 +0100
@@ -11,8 +11,8 @@ if (!defined('TEST_FILES_PATH')) {
     define('TEST_FILES_PATH', __DIR__ . DIRECTORY_SEPARATOR . '_files' . DIRECTORY_SEPARATOR);
 }
 
-$composer = file_exists(__DIR__ . '/../vendor/autoload.php');
-$phar     = file_exists(__DIR__ . '/autoload.php');
+$composer = true;
+$phar     = false;
 
 if ($composer && $phar) {
     print 'More than one test fixture autoloader is available, exiting.' . PHP_EOL;
@@ -28,10 +28,15 @@ if (!$composer && !$phar) {
 
 if ($composer) {
     if (!defined('PHPUNIT_COMPOSER_INSTALL')) {
-        define('PHPUNIT_COMPOSER_INSTALL', dirname(__DIR__) . '/vendor/autoload.php');
+        define('PHPUNIT_COMPOSER_INSTALL', '@PATH@/autoload.php');
     }
 
-    require_once __DIR__ . '/../vendor/autoload.php';
+    require_once PHPUNIT_COMPOSER_INSTALL;
+    require_once __DIR__ . '/_files/CoverageNamespacedFunctionTest.php';
+    require_once __DIR__ . '/_files/CoveredFunction.php';
+    require_once __DIR__ . '/_files/Generator.php';
+    require_once __DIR__ . '/_files/NamespaceCoveredFunction.php';
+    require_once __DIR__ . '/autoload.php';
 }
 
 if ($phar) {
diff -up ./tests/unit/TextUI/Command/Commands/VersionCheckCommandTest.php.rpm ./tests/unit/TextUI/Command/Commands/VersionCheckCommandTest.php
--- ./tests/unit/TextUI/Command/Commands/VersionCheckCommandTest.php.rpm	2024-10-28 16:44:45.000000000 +0100
+++ ./tests/unit/TextUI/Command/Commands/VersionCheckCommandTest.php	2024-10-28 17:05:46.654936571 +0100
@@ -28,15 +28,16 @@ final class VersionCheckCommandTest exte
     {
         return [
             [
-                'You are using the latest version of PHPUnit.' . PHP_EOL,
+                'You are using the latest version of PHPUnit.' . PHP_EOL . PHP_EOL,
                 10,
                 '10.5.0',
                 '10.5.0',
                 '10.5.0',
             ],
             [
-                'You are not using the latest version of PHPUnit.' . PHP_EOL .
+                'You are not using the latest version of PHPUnit.' . PHP_EOL . PHP_EOL .
                 'The latest version compatible with PHPUnit 10.5.0 is PHPUnit 10.5.1.' . PHP_EOL .
+                'Try a system update for new phpunit10 package.' . PHP_EOL . PHP_EOL .
                 'The latest version is PHPUnit 10.5.1.' . PHP_EOL,
                 10,
                 '10.5.0',
@@ -44,9 +45,11 @@ final class VersionCheckCommandTest exte
                 '10.5.1',
             ],
             [
-                'You are not using the latest version of PHPUnit.' . PHP_EOL .
+                'You are not using the latest version of PHPUnit.' . PHP_EOL . PHP_EOL .
                 'The latest version compatible with PHPUnit 10.5.0 is PHPUnit 10.5.1.' . PHP_EOL .
-                'The latest version is PHPUnit 11.0.0.' . PHP_EOL,
+                'Try a system update for new phpunit10 package.' . PHP_EOL . PHP_EOL .
+                'The latest version is PHPUnit 11.0.0.' . PHP_EOL .
+                'Try to install and use the phpunit11 command.' . PHP_EOL . PHP_EOL,
                 10,
                 '10.5.0',
                 '11.0.0',