diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 13f565a..eb885e5 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -21,7 +21,13 @@ public function getConfigTreeBuilder(): TreeBuilder
                     ->defaultValue('cache.app')
                     ->info('A cache for storing access tokens.')
                 ->end()
-            ->end();
+                ->enumNode('forced_transport')
+                    ->values(['grpc', 'rest'])
+                    ->defaultNull()
+                    ->info('A forced transport for all messenger transports.')
+                ->end()
+            ->end()
+        ;
 
         return $treeBuilder;
     }
diff --git a/DependencyInjection/PetitPressGpsMessengerExtension.php b/DependencyInjection/PetitPressGpsMessengerExtension.php
index 89e31a7..db9beb8 100644
--- a/DependencyInjection/PetitPressGpsMessengerExtension.php
+++ b/DependencyInjection/PetitPressGpsMessengerExtension.php
@@ -24,9 +24,12 @@ public function load(array $configs, ContainerBuilder $container): void
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
 
+        $gpsTransportFactoryDefinition = $container->getDefinition(GpsTransportFactory::class);
         if ($config['auth_cache']) {
-            $gpsTransportFactoryDefinition = $container->getDefinition(GpsTransportFactory::class);
             $gpsTransportFactoryDefinition->replaceArgument(1, new Reference($config['auth_cache']));
         }
+        if (isset($config['forced_transport'])) {
+            $gpsTransportFactoryDefinition->replaceArgument(2, $config['forced_transport']);
+        }
     }
 }
diff --git a/Resources/config/services.php b/Resources/config/services.php
index ed46c73..8e5ae41 100644
--- a/Resources/config/services.php
+++ b/Resources/config/services.php
@@ -13,6 +13,7 @@
         ->set(GpsTransportFactory::class)
         ->args([
             new ReferenceConfigurator(GpsConfigurationResolverInterface::class),
+            null,
             null
         ])
         ->tag('messenger.transport_factory')
diff --git a/Tests/Transport/GpsTransportFactoryTest.php b/Tests/Transport/GpsTransportFactoryTest.php
index ca706ee..7605971 100644
--- a/Tests/Transport/GpsTransportFactoryTest.php
+++ b/Tests/Transport/GpsTransportFactoryTest.php
@@ -17,7 +17,8 @@ protected function setUp(): void
     {
         $this->subject = new GpsTransportFactory(
             $this->createMock(GpsConfigurationResolverInterface::class),
-            $this->createMock(CacheItemPoolInterface::class)
+            $this->createMock(CacheItemPoolInterface::class),
+            null
         );
     }
 
diff --git a/Transport/GpsTransportFactory.php b/Transport/GpsTransportFactory.php
index a342e73..8e6fb45 100644
--- a/Transport/GpsTransportFactory.php
+++ b/Transport/GpsTransportFactory.php
@@ -18,11 +18,16 @@ final class GpsTransportFactory implements TransportFactoryInterface
 {
     private GpsConfigurationResolverInterface $gpsConfigurationResolver;
     private ?CacheItemPoolInterface $cache;
+    private ?string $forcedTransport;
 
-    public function __construct(GpsConfigurationResolverInterface $gpsConfigurationResolver, ?CacheItemPoolInterface $cache)
-    {
+    public function __construct(
+        GpsConfigurationResolverInterface $gpsConfigurationResolver,
+        ?CacheItemPoolInterface $cache,
+        ?string $forcedTransport
+    ) {
         $this->gpsConfigurationResolver = $gpsConfigurationResolver;
         $this->cache = $cache;
+        $this->forcedTransport = $forcedTransport;
     }
 
     /**
@@ -36,6 +41,9 @@ public function createTransport(string $dsn, array $options, SerializerInterface
         if ($this->cache instanceof CacheItemPoolInterface) {
             $clientConfig['authCache'] ??= $this->cache;
         }
+        if (isset($this->forcedTransport)) {
+            $clientConfig['transport'] = $this->forcedTransport;
+        }
 
         return new GpsTransport(
             new PubSubClient($clientConfig),