diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 301cad5..9e3bbfd 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -15,6 +15,9 @@ jobs:
         php-version:
           - "8.1"
           - "8.2"
+          - "8.3"
+          - "8.4"
+          - "8.5"
 
     steps:
       - name: Checkout
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 2aa5e2b..fe83f6d 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -5,4 +5,3 @@ parameters:
     - tests/
   fileExtensions:
     - php
-    - phpt
diff --git a/tests/integration/stringify-declared.phpt b/tests/integration/stringify-declared.phpt
index 61a0da2..ce511ce 100644
--- a/tests/integration/stringify-declared.phpt
+++ b/tests/integration/stringify-declared.phpt
@@ -5,15 +5,17 @@ declare(strict_types=1);
 
 require 'vendor/autoload.php';
 
+use Respect\Stringifier\Helpers\ObjectHelper;
+
 outputMultiple(
     Traversable::class,
     ArrayIterator::class,
     BasicEnumeration::class,
-    Respect\Stringifier\Helpers\ObjectHelper::class,
+    ObjectHelper::class,
 );
 ?>
 --EXPECT--
 `Traversable`
 `ArrayIterator`
 `BasicEnumeration`
-`Respect\Stringifier\Helpers\ObjectHelper`
\ No newline at end of file
+`Respect\Stringifier\Helpers\ObjectHelper`