diff --git a/composer.json b/composer.json
index cc516f39..0a8c0e52 100755
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
     "type": "silverstripe-vendormodule",
     "license": "BSD-3-Clause",
     "require": {
-        "php": "^8.1",
+        "php": "^8.3",
         "silverstripe/framework": "^6",
         "silverstripe/vendor-plugin": "^2",
         "webonyx/graphql-php": "^15.0.1",
diff --git a/tests/Schema/IntegrationTest.php b/tests/Schema/IntegrationTest.php
index c563abe4..70a5df58 100644
--- a/tests/Schema/IntegrationTest.php
+++ b/tests/Schema/IntegrationTest.php
@@ -43,7 +43,7 @@
 use GraphQL\Validator\Rules\QueryComplexity;
 use GraphQL\Validator\Rules\QueryDepth;
 use GraphQL\Validator\ValidationContext;
-use ReflectionProperty;
+use ReflectionClass;
 
 class IntegrationTest extends SapphireTest
 {
@@ -1688,11 +1688,10 @@ public function testGlobalRuleNotRemoved()
 
     private function removeDocumentValidatorRule(string $ruleName): void
     {
-        $reflectionRules = new ReflectionProperty(DocumentValidator::class, 'rules');
-        $reflectionRules->setAccessible(true);
-        $rules = $reflectionRules->getValue();
+        $reflectionValidator = new ReflectionClass(DocumentValidator::class);
+        $rules = $reflectionValidator->getStaticPropertyValue('rules');
         unset($rules[$ruleName]);
-        $reflectionRules->setValue($rules);
+        $reflectionValidator->setStaticPropertyValue('rules', $rules);
     }
 
     private function createProviderForComplexityOrDepth(int $limit): array