diff --git a/extensions/package-manager/src/Command/CheckForUpdatesHandler.php b/extensions/package-manager/src/Command/CheckForUpdatesHandler.php
index b2cd64c4a..e4dab09dc 100755
--- a/extensions/package-manager/src/Command/CheckForUpdatesHandler.php
+++ b/extensions/package-manager/src/Command/CheckForUpdatesHandler.php
@@ -9,17 +9,15 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Flarum\PackageManager\Exception\ComposerCommandFailedException;
 use Flarum\PackageManager\LastUpdateCheck;
-use Flarum\PackageManager\OutputLogger;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
 
 class CheckForUpdatesHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -28,16 +26,10 @@ class CheckForUpdatesHandler
      */
     protected $lastUpdateCheck;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
-    public function __construct(Application $composer, LastUpdateCheck $lastUpdateCheck, OutputLogger $logger)
+    public function __construct(ComposerAdapter $composer, LastUpdateCheck $lastUpdateCheck)
     {
         $this->composer = $composer;
         $this->lastUpdateCheck = $lastUpdateCheck;
-        $this->logger = $logger;
     }
 
     /**
@@ -109,23 +101,19 @@ class CheckForUpdatesHandler
      */
     protected function runComposerCommand(bool $minorOnly): string
     {
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'outdated',
-            '-D' => true,
-            '--minor-only' => $minorOnly,
-            '--format' => 'json',
-        ]);
+        $output = $this->composer->run(
+            new ArrayInput([
+                'command' => 'outdated',
+                '-D' => true,
+                '--minor-only' => $minorOnly,
+                '--format' => 'json',
+            ])
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerCommandFailedException('', $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerCommandFailedException('', $output->getContents());
         }
 
-        return $output;
+        return $output->getContents();
     }
 }
diff --git a/extensions/package-manager/src/Command/GlobalUpdateHandler.php b/extensions/package-manager/src/Command/GlobalUpdateHandler.php
index 5a67f94c7..d5032bf9a 100644
--- a/extensions/package-manager/src/Command/GlobalUpdateHandler.php
+++ b/extensions/package-manager/src/Command/GlobalUpdateHandler.php
@@ -9,19 +9,17 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
 use Flarum\Bus\Dispatcher as FlarumDispatcher;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Flarum\PackageManager\Event\FlarumUpdated;
 use Flarum\PackageManager\Exception\ComposerUpdateFailedException;
-use Flarum\PackageManager\OutputLogger;
-use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Input\StringInput;
 
 class GlobalUpdateHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -35,17 +33,11 @@ class GlobalUpdateHandler
      */
     protected $commandDispatcher;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
-    public function __construct(Application $composer, Dispatcher $events, FlarumDispatcher $commandDispatcher, OutputLogger $logger)
+    public function __construct(ComposerAdapter $composer, Dispatcher $events, FlarumDispatcher $commandDispatcher)
     {
         $this->composer = $composer;
         $this->events = $events;
         $this->commandDispatcher = $commandDispatcher;
-        $this->logger = $logger;
     }
 
     /**
@@ -55,22 +47,12 @@ class GlobalUpdateHandler
     {
         $command->actor->assertAdmin();
 
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'update',
-            '--prefer-dist' => true,
-            '--no-dev' => true,
-            '-a' => true,
-            '--with-all-dependencies' => true,
-        ]);
+        $output = $this->composer->run(
+            new StringInput("update --prefer-dist --no-dev -a --with-all-dependencies")
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerUpdateFailedException('*', $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerUpdateFailedException('*', $output->getContents());
         }
 
         $this->commandDispatcher->dispatch(
diff --git a/extensions/package-manager/src/Command/MajorUpdateHandler.php b/extensions/package-manager/src/Command/MajorUpdateHandler.php
index f59006776..a1dd5d89f 100644
--- a/extensions/package-manager/src/Command/MajorUpdateHandler.php
+++ b/extensions/package-manager/src/Command/MajorUpdateHandler.php
@@ -9,21 +9,19 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
 use Flarum\Foundation\Paths;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Support\Arr;
 use Flarum\PackageManager\Event\FlarumUpdated;
 use Flarum\PackageManager\Exception\ComposerUpdateFailedException;
 use Flarum\PackageManager\LastUpdateCheck;
-use Flarum\PackageManager\OutputLogger;
 use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
 
 class MajorUpdateHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -37,11 +35,6 @@ class MajorUpdateHandler
      */
     protected $events;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
     /**
      * @var Paths
      */
@@ -52,12 +45,11 @@ class MajorUpdateHandler
      */
     protected $composerJson;
 
-    public function __construct(Application $composer, LastUpdateCheck $lastUpdateCheck, Dispatcher $events, OutputLogger $logger, Paths $paths)
+    public function __construct(ComposerAdapter $composer, LastUpdateCheck $lastUpdateCheck, Dispatcher $events, Paths $paths)
     {
         $this->composer = $composer;
         $this->lastUpdateCheck = $lastUpdateCheck;
         $this->events = $events;
-        $this->logger = $logger;
         $this->paths = $paths;
     }
 
@@ -128,6 +120,7 @@ class MajorUpdateHandler
     protected function revertComposerJson(): void
     {
         $composerJsonPath = $this->paths->base . '/composer.json';
+        // @todo use filesystem for all file_get_contents
         file_put_contents($composerJsonPath, $this->composerJson);
     }
 
@@ -136,24 +129,20 @@ class MajorUpdateHandler
      */
     protected function runCommand(bool $dryRun): void
     {
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'update',
-            '--prefer-dist' => true,
-            '--no-plugins' => true,
-            '--no-dev' => true,
-            '-a' => true,
-            '--with-all-dependencies' => true,
-            '--dry-run' => $dryRun,
-        ]);
+        $output = $this->composer->run(
+            new ArrayInput([
+                'command' => 'update',
+                '--prefer-dist' => true,
+                '--no-plugins' => true,
+                '--no-dev' => true,
+                '-a' => true,
+                '--with-all-dependencies' => true,
+                '--dry-run' => $dryRun,
+            ])
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerUpdateFailedException('*', $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerUpdateFailedException('*', $output->getContents());
         }
     }
 }
diff --git a/extensions/package-manager/src/Command/MinorFlarumUpdateHandler.php b/extensions/package-manager/src/Command/MinorFlarumUpdateHandler.php
index af3c045f4..01e5a3bb7 100755
--- a/extensions/package-manager/src/Command/MinorFlarumUpdateHandler.php
+++ b/extensions/package-manager/src/Command/MinorFlarumUpdateHandler.php
@@ -9,19 +9,17 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Flarum\PackageManager\Event\FlarumUpdated;
 use Flarum\PackageManager\Exception\ComposerUpdateFailedException;
 use Flarum\PackageManager\LastUpdateCheck;
-use Flarum\PackageManager\OutputLogger;
-use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Input\StringInput;
 
 class MinorFlarumUpdateHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -35,17 +33,11 @@ class MinorFlarumUpdateHandler
      */
     protected $events;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
-    public function __construct(Application $composer, LastUpdateCheck $lastUpdateCheck, Dispatcher $events, OutputLogger $logger)
+    public function __construct(ComposerAdapter $composer, LastUpdateCheck $lastUpdateCheck, Dispatcher $events)
     {
         $this->composer = $composer;
         $this->lastUpdateCheck = $lastUpdateCheck;
         $this->events = $events;
-        $this->logger = $logger;
     }
 
     /**
@@ -56,23 +48,12 @@ class MinorFlarumUpdateHandler
     {
         $command->actor->assertAdmin();
 
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'update',
-            'packages' => ["flarum/*"],
-            '--prefer-dist' => true,
-            '--no-dev' => true,
-            '-a' => true,
-            '--with-all-dependencies' => true,
-        ]);
+        $output = $this->composer->run(
+            new StringInput("update flarum/* --prefer-dist --no-dev -a --with-all-dependencies")
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerUpdateFailedException('flarum/*', $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerUpdateFailedException('flarum/*', $output->getContents());
         }
 
         $this->lastUpdateCheck->forget('flarum/*', true);
diff --git a/extensions/package-manager/src/Command/RemoveExtensionHandler.php b/extensions/package-manager/src/Command/RemoveExtensionHandler.php
index 2b0db42fa..9b3fd229c 100755
--- a/extensions/package-manager/src/Command/RemoveExtensionHandler.php
+++ b/extensions/package-manager/src/Command/RemoveExtensionHandler.php
@@ -9,21 +9,18 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
 use Flarum\Extension\ExtensionManager;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Flarum\PackageManager\Exception\ComposerCommandFailedException;
-use Flarum\PackageManager\Exception\ComposerUpdateFailedException;
 use Flarum\PackageManager\Exception\ExtensionNotInstalledException;
 use Flarum\PackageManager\Extension\Event\Removed;
-use Flarum\PackageManager\OutputLogger;
-use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Input\StringInput;
 
 class RemoveExtensionHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -37,17 +34,11 @@ class RemoveExtensionHandler
      */
     protected $events;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
-    public function __construct(Application $composer, ExtensionManager $extensions, Dispatcher $events, OutputLogger $logger)
+    public function __construct(ComposerAdapter $composer, ExtensionManager $extensions, Dispatcher $events)
     {
         $this->composer = $composer;
         $this->extensions = $extensions;
         $this->events = $events;
-        $this->logger = $logger;
     }
 
     /**
@@ -64,19 +55,12 @@ class RemoveExtensionHandler
             throw new ExtensionNotInstalledException($command->extensionId);
         }
 
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'remove',
-            'packages' => [$extension->name],
-        ]);
+        $output = $this->composer->run(
+            new StringInput("remove $extension->name")
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerCommandFailedException($extension->name, $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerCommandFailedException($extension->name, $output->getContents());
         }
 
         $this->events->dispatch(
diff --git a/extensions/package-manager/src/Command/RequireExtensionHandler.php b/extensions/package-manager/src/Command/RequireExtensionHandler.php
index 801a8f9ef..f900f3235 100755
--- a/extensions/package-manager/src/Command/RequireExtensionHandler.php
+++ b/extensions/package-manager/src/Command/RequireExtensionHandler.php
@@ -9,22 +9,20 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
 use Flarum\Extension\ExtensionManager;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Flarum\PackageManager\Exception\ComposerRequireFailedException;
 use Flarum\PackageManager\Exception\ExtensionAlreadyInstalledException;
 use Flarum\PackageManager\Extension\Event\Installed;
 use Flarum\PackageManager\Extension\ExtensionUtils;
-use Flarum\PackageManager\OutputLogger;
 use Flarum\PackageManager\RequirePackageValidator;
-use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Input\StringInput;
 
 class RequireExtensionHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -43,18 +41,12 @@ class RequireExtensionHandler
      */
     protected $events;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
-    public function __construct(Application $composer, ExtensionManager $extensions, RequirePackageValidator $validator, Dispatcher $events, OutputLogger $logger)
+    public function __construct(ComposerAdapter $composer, ExtensionManager $extensions, RequirePackageValidator $validator, Dispatcher $events)
     {
         $this->composer = $composer;
         $this->extensions = $extensions;
         $this->validator = $validator;
         $this->events = $events;
-        $this->logger = $logger;
     }
 
     /**
@@ -74,19 +66,12 @@ class RequireExtensionHandler
             throw new ExtensionAlreadyInstalledException($extension);
         }
 
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'require',
-            'packages' => [$command->package],
-        ]);
+        $output = $this->composer->run(
+            new StringInput("require $command->package")
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerRequireFailedException($command->package, $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerRequireFailedException($command->package, $output->getContents());
         }
 
         $this->events->dispatch(
diff --git a/extensions/package-manager/src/Command/UpdateExtensionHandler.php b/extensions/package-manager/src/Command/UpdateExtensionHandler.php
index 9f53d474e..c0802e404 100755
--- a/extensions/package-manager/src/Command/UpdateExtensionHandler.php
+++ b/extensions/package-manager/src/Command/UpdateExtensionHandler.php
@@ -9,23 +9,20 @@
 
 namespace Flarum\PackageManager\Command;
 
-use Composer\Console\Application;
 use Flarum\Extension\ExtensionManager;
-use Flarum\Settings\SettingsRepositoryInterface;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Events\Dispatcher;
 use Flarum\PackageManager\Exception\ComposerUpdateFailedException;
 use Flarum\PackageManager\Exception\ExtensionNotInstalledException;
 use Flarum\PackageManager\Extension\Event\Updated;
-use Flarum\PackageManager\OutputLogger;
 use Flarum\PackageManager\UpdateExtensionValidator;
 use Flarum\PackageManager\LastUpdateCheck;
-use Symfony\Component\Console\Input\ArrayInput;
-use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Input\StringInput;
 
 class UpdateExtensionHandler
 {
     /**
-     * @var Application
+     * @var ComposerAdapter
      */
     protected $composer;
 
@@ -49,25 +46,18 @@ class UpdateExtensionHandler
      */
     protected $events;
 
-    /**
-     * @var OutputLogger
-     */
-    protected $logger;
-
     public function __construct(
-        Application $composer,
+        ComposerAdapter $composer,
         ExtensionManager $extensions,
         UpdateExtensionValidator $validator,
         LastUpdateCheck $lastUpdateCheck,
-        Dispatcher $events,
-        OutputLogger $logger)
+        Dispatcher $events)
     {
         $this->composer = $composer;
         $this->extensions = $extensions;
         $this->validator = $validator;
         $this->lastUpdateCheck = $lastUpdateCheck;
         $this->events = $events;
-        $this->logger = $logger;
     }
 
     /**
@@ -86,19 +76,12 @@ class UpdateExtensionHandler
             throw new ExtensionNotInstalledException($command->extensionId);
         }
 
-        $output = new BufferedOutput();
-        $input = new ArrayInput([
-            'command' => 'require',
-            'packages' => ["$extension->name:*"],
-        ]);
+        $output = $this->composer->run(
+            new StringInput("require $extension->name:*")
+        );
 
-        $exitCode = $this->composer->run($input, $output);
-        $output = $output->fetch();
-
-        $this->logger->log($input->__toString(), $output, $exitCode);
-
-        if ($exitCode !== 0) {
-            throw new ComposerUpdateFailedException($extension->name, $output);
+        if ($output->getExitCode() !== 0) {
+            throw new ComposerUpdateFailedException($extension->name, $output->getContents());
         }
 
         $this->lastUpdateCheck->forget($extension->name);
diff --git a/extensions/package-manager/src/Composer/ComposerAdapter.php b/extensions/package-manager/src/Composer/ComposerAdapter.php
new file mode 100644
index 000000000..c94aaa0e1
--- /dev/null
+++ b/extensions/package-manager/src/Composer/ComposerAdapter.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\PackageManager\Composer;
+
+use Composer\Console\Application;
+use Flarum\PackageManager\OutputLogger;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\BufferedOutput;
+
+class ComposerAdapter
+{
+    /**
+     * @var Application
+     */
+    private $application;
+
+    /**
+     * @var OutputLogger
+     */
+    private $logger;
+
+    public function __construct(Application $application, OutputLogger $logger)
+    {
+        $this->application = $application;
+        $this->logger = $logger;
+    }
+
+    public function run(InputInterface $input): ComposerOutput
+    {
+        $output = new BufferedOutput();
+
+        $exitCode = $this->application->run($input, $output);
+
+        $outputContents = $output->fetch();
+
+        $this->logger->log($input->__toString(), $outputContents, $exitCode);
+
+        return new ComposerOutput($exitCode, $outputContents);
+    }
+}
diff --git a/extensions/package-manager/src/Composer/ComposerOutput.php b/extensions/package-manager/src/Composer/ComposerOutput.php
new file mode 100644
index 000000000..87719880a
--- /dev/null
+++ b/extensions/package-manager/src/Composer/ComposerOutput.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\PackageManager\Composer;
+
+class ComposerOutput
+{
+    /**
+     * @var int
+     */
+    protected $exitCode;
+
+    /**
+     * @var string
+     */
+    protected $contents;
+
+    public function __construct(int $exitCode, string $contents)
+    {
+        $this->exitCode = $exitCode;
+        $this->contents = $contents;
+    }
+
+    public function getExitCode(): int
+    {
+        return $this->exitCode;
+    }
+
+    public function getContents(): string
+    {
+        return $this->contents;
+    }
+}
diff --git a/extensions/package-manager/src/PackageManagerServiceProvider.php b/extensions/package-manager/src/PackageManagerServiceProvider.php
index 2ab914c33..7c65a6e05 100755
--- a/extensions/package-manager/src/PackageManagerServiceProvider.php
+++ b/extensions/package-manager/src/PackageManagerServiceProvider.php
@@ -16,6 +16,7 @@ use Flarum\Foundation\AbstractServiceProvider;
 use Flarum\Foundation\Paths;
 use Flarum\Frontend\RecompileFrontendAssets;
 use Flarum\Locale\LocaleManager;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Contracts\Events\Dispatcher;
 use Monolog\Formatter\LineFormatter;
@@ -29,7 +30,7 @@ class PackageManagerServiceProvider extends AbstractServiceProvider
 {
     public function register()
     {
-        $this->container->singleton(Application::class, function (Container $container) {
+        $this->container->singleton(ComposerAdapter::class, function (Container $container) {
             // This should only ever be resolved when running composer commands,
             // because we modify other environment configurations.
             $composer = new Application();
@@ -48,10 +49,10 @@ class PackageManagerServiceProvider extends AbstractServiceProvider
             @ini_set('memory_limit', '1G');
             @set_time_limit(5 * 60);
 
-            return $composer;
+            return new ComposerAdapter($composer, $container->make(OutputLogger::class));
         });
 
-        $this->container->alias(Application::class, 'flarum.composer');
+        $this->container->alias(ComposerAdapter::class, 'flarum.composer');
 
         $this->container->singleton(OutputLogger::class, function (Container $container) {
             $logPath = $container->make(Paths::class)->storage.'/logs/composer/output.log';
diff --git a/extensions/package-manager/src/RequirePackageValidator.php b/extensions/package-manager/src/RequirePackageValidator.php
index ec5599d41..6667ce5d6 100755
--- a/extensions/package-manager/src/RequirePackageValidator.php
+++ b/extensions/package-manager/src/RequirePackageValidator.php
@@ -17,6 +17,6 @@ class RequirePackageValidator extends AbstractValidator
      * {@inheritdoc}
      */
     protected $rules = [
-        'package' => 'required|string'
+        'package' => ['required', 'string', 'regex:/^[A-z0-9-_]+\/[A-z-0-9]+(?::[A-z-0-9.->=<_]+){0,1}$/i']
     ];
 }
diff --git a/extensions/package-manager/tests/integration/TestCase.php b/extensions/package-manager/tests/integration/TestCase.php
index 92d1efc95..1adaa1de8 100644
--- a/extensions/package-manager/tests/integration/TestCase.php
+++ b/extensions/package-manager/tests/integration/TestCase.php
@@ -9,18 +9,13 @@
 
 namespace Flarum\PackageManager\Tests\integration;
 
-use Composer\Config;
-use Composer\Console\Application;
-use Flarum\Extension\ExtensionManager;
 use Flarum\Foundation\Paths;
+use Flarum\PackageManager\Composer\ComposerAdapter;
 use Flarum\PackageManager\Extension\ExtensionUtils;
 use Flarum\Testing\integration\RetrievesAuthorizedUsers;
-use Illuminate\Contracts\Container\Container;
 use Illuminate\Support\Arr;
 use Psr\Http\Message\ResponseInterface;
-use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\StringInput;
-use Symfony\Component\Console\Output\NullOutput;
 
 class TestCase extends \Flarum\Testing\integration\TestCase
 {
@@ -81,10 +76,9 @@ class TestCase extends \Flarum\Testing\integration\TestCase
 
     protected function composer(string $command): void
     {
-        /** @var Application $composer */
-        $composer = $this->app()->getContainer()->make(Application::class);
-        $output = new NullOutput();
-        $composer->run(new StringInput($command), $output);
+        /** @var ComposerAdapter $composer */
+        $composer = $this->app()->getContainer()->make(ComposerAdapter::class);
+        $composer->run(new StringInput($command));
     }
 
     protected function guessedCause(ResponseInterface $response): ?string