diff --git a/.travis.yml b/.travis.yml
index 8f52bed..64eee5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,8 @@ php:
   - 7.2
   - 7.3
   - 7.4
+  - 8.0
+  - 8.1
 
 before_install:
   - travis_retry composer self-update
@@ -12,4 +14,4 @@ install:
   - travis_retry composer update --no-interaction --prefer-dist --prefer-stable
 
 script:
-  - vendor/bin/phpunit
\ No newline at end of file
+  - vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index 39f8379..150dbb0 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         }
     ],
     "require-dev": {
-        "php": ">=7.0",
+        "php": ">=8.0",
         "orchestra/testbench": "~4.0",
         "phpunit/phpunit": "^8.0|^9.0",
         "laravel/passport": "^8.0"
diff --git a/src/Generator.php b/src/Generator.php
index 804bad3..41ddfda 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -190,13 +190,9 @@ protected function getFormRules(): array
         $parameters = $action_instance->getParameters();
 
         foreach ($parameters as $parameter) {
-            $class = $parameter->getClass();
-
-            if (!$class) {
-                continue;
-            }
-
-            $class_name = $class->getName();
+            $class_name = $name = $parameter->getType() && !$parameter->getType()->isBuiltin()
+                ? new \ReflectionClass($parameter->getType()->getName())
+                : null;
 
             if (is_subclass_of($class_name, FormRequest::class)) {
                 return (new $class_name)->rules();