diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 87668e5..495709a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,12 +9,13 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [8.2, 8.3, 8.4]
-        symfony: [^6.4, false]
+        php: [8.2, 8.3, 8.4, 8.5]
+        symfony: [false]
         dependency: [stable]
         include:
+          - { php: 8.2, symfony: ^6.4 , dependency: stable }
           - { php: 8.4, symfony: ^7.4, dependency: highest }
-          - { php: 8.4, symfony: ^8.0, dependency: highest }
+          - { php: 8.4, symfony: false, dependency: highest }
 
     env:
       SYMFONY_REQUIRE: ${{ matrix.symfony }}
diff --git a/src/OpenAIBundle.php b/src/OpenAIBundle.php
index 9d78a06..484b51a 100644
--- a/src/OpenAIBundle.php
+++ b/src/OpenAIBundle.php
@@ -7,7 +7,6 @@
 use OpenAI\Client;
 use OpenAI\Contracts\ClientContract;
 use OpenAI\Factory;
-use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
 use Symfony\Component\Config\Definition\Configurator\DefinitionConfigurator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
@@ -23,13 +22,11 @@ final class OpenAIBundle extends AbstractBundle
     public function configure(DefinitionConfigurator $definition): void
     {
         $root = $definition->rootNode();
-        assert($root instanceof ArrayNodeDefinition);
         $children = $root->children();
         $children
             ->scalarNode('api_key')
             ->defaultValue('%env(OPENAI_API_KEY)%')
-            ->info('OpenAI API Key used to authenticate with the OpenAI API')
-            ->isRequired();
+            ->info('OpenAI API Key used to authenticate with the OpenAI API');
         $children
             ->scalarNode('organization')
             ->info('OpenAI API Organization used to authenticate with the OpenAI API')