diff --git a/src/Embedder/AttachmentEmbedder.php b/src/Embedder/AttachmentEmbedder.php
index 212ba9c..9db2512 100755
--- a/src/Embedder/AttachmentEmbedder.php
+++ b/src/Embedder/AttachmentEmbedder.php
@@ -4,6 +4,7 @@
 
 use Eduardokum\LaravelMailAutoEmbed\Models\EmbeddableEntity;
 use Exception;
+use Illuminate\Foundation\Application;
 use Illuminate\Support\Str;
 use Swift_EmbeddedFile;
 use Swift_Message;
@@ -160,6 +161,6 @@ protected function embed($body, $name, $type)
      */
     private function isLaravel9()
     {
-        return version_compare(app()->version(), '9.0.0', '>=');
+        return version_compare(Application::VERSION, '9.0.0', '>=');
     }
 }
diff --git a/src/ServiceProvider.php b/src/ServiceProvider.php
index e74170f..d9919fa 100755
--- a/src/ServiceProvider.php
+++ b/src/ServiceProvider.php
@@ -4,6 +4,7 @@
 
 use Eduardokum\LaravelMailAutoEmbed\Listeners\SwiftEmbedImages;
 use Eduardokum\LaravelMailAutoEmbed\Listeners\SymfonyEmbedImages;
+use Illuminate\Foundation\Application;
 use Illuminate\Mail\Events\MessageSending;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Facades\Event;
@@ -21,7 +22,7 @@ class ServiceProvider extends BaseServiceProvider
     public function boot()
     {
         $this->publishes([$this->getConfigPath() => config_path('mail-auto-embed.php')], 'config');
-        if (version_compare(app()->version(), '9.0.0', '>=')) {
+        if (version_compare(Application::VERSION, '9.0.0', '>=')) {
             Event::listen(function (MessageSending $event) {
                 (new SymfonyEmbedImages($this->app['config']->get('mail-auto-embed')))
                     ->beforeSendPerformed($event);