diff --git a/tests/GlobalIdTest.php b/tests/GlobalIdTest.php
index 424bde7..72385a9 100644
--- a/tests/GlobalIdTest.php
+++ b/tests/GlobalIdTest.php
@@ -23,7 +23,7 @@ public function value_equality()
         $this->assertTrue((new GlobalId('gid://app/model/id'))->equalsTo(new GlobalId('gid://app/model/id')));
     }
 
-    public function invalidAppNames()
+    public static function invalidAppNames()
     {
         return [
             'empty name' => [
diff --git a/tests/URI/GIDValidationTest.php b/tests/URI/GIDValidationTest.php
index 4a5ed93..eeb1f57 100644
--- a/tests/URI/GIDValidationTest.php
+++ b/tests/URI/GIDValidationTest.php
@@ -6,7 +6,7 @@
 
 class GIDValidationTest extends TestCase
 {
-    public function invalidGids()
+    public static function invalidGids()
     {
         return [
             'missing app' => [