diff --git a/src/ServiceProvider.php b/src/ServiceProvider.php
index c876fe66..e3d1bd1e 100644
--- a/src/ServiceProvider.php
+++ b/src/ServiceProvider.php
@@ -13,7 +13,6 @@
 use Illuminate\Testing\TestResponse;
 use Inertia\Testing\TestResponseMacros;
 use Illuminate\Support\ServiceProvider as BaseServiceProvider;
-use Illuminate\Foundation\Testing\TestResponse as LegacyTestResponse;
 
 class ServiceProvider extends BaseServiceProvider
 {
@@ -98,13 +97,6 @@ protected function registerTestingMacros(): void
             return;
         }
 
-        // Laravel <= 6.0
-        if (class_exists(LegacyTestResponse::class)) {
-            LegacyTestResponse::mixin(new TestResponseMacros());
-
-            return;
-        }
-
         throw new LogicException('Could not detect TestResponse class.');
     }
 }