diff --git a/tests/ApiProblemBuilderTest.php b/tests/ApiProblemBuilderTest.php
index 4c8ec8b..559cc88 100644
--- a/tests/ApiProblemBuilderTest.php
+++ b/tests/ApiProblemBuilderTest.php
@@ -40,7 +40,7 @@ public function buildFromRendererTest(): void
         self::assertEquals($expected, json_decode($actual->getContent(), true));
     }
 
-    public function dataSetsToBuildFromException(): array
+    public static function dataSetsToBuildFromException(): array
     {
         return [
             'path not found, no apiResponseTypes' => [
diff --git a/tests/Middleware/RequestValidationTest.php b/tests/Middleware/RequestValidationTest.php
index 1076e02..ac31c38 100644
--- a/tests/Middleware/RequestValidationTest.php
+++ b/tests/Middleware/RequestValidationTest.php
@@ -44,7 +44,7 @@ public function registersResultInstanceInContainer(): void
         $sut->handle(Request::create($url), fn($var) => new Response());
     }
 
-    public function dataSetsThatThrowCannotProcessRequest(): array
+    public static function dataSetsThatThrowCannotProcessRequest(): array
     {
         return [
             'path not found' => [
diff --git a/tests/Middleware/ResponseJsonFlatTest.php b/tests/Middleware/ResponseJsonFlatTest.php
index 7e96c11..67ceb6f 100644
--- a/tests/Middleware/ResponseJsonFlatTest.php
+++ b/tests/Middleware/ResponseJsonFlatTest.php
@@ -21,7 +21,7 @@
  */
 class ResponseJsonFlatTest extends TestCase
 {
-    public function dataSetsToHandle(): array
+    public static function dataSetsToHandle(): array
     {
         return [
             'valid results return valid responses' => [
diff --git a/tests/Middleware/ResponseJsonNestedTest.php b/tests/Middleware/ResponseJsonNestedTest.php
index 3348f87..7ee52c1 100644
--- a/tests/Middleware/ResponseJsonNestedTest.php
+++ b/tests/Middleware/ResponseJsonNestedTest.php
@@ -21,7 +21,7 @@
  */
 class ResponseJsonNestedTest extends TestCase
 {
-    public function dataSetsToHandle(): array
+    public static function dataSetsToHandle(): array
     {
         return [
             'valid results return valid responses' => [