diff --git a/composer.json b/composer.json
index afaa48a..8bcd85b 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^2.0",
-        "phpunit/phpunit": "^8.5.14 || ^9.0",
+        "phpunit/phpunit": "^9.0 || ^10.0",
         "squizlabs/php_codesniffer": "^3.5.0"
     },
     "autoload": {
diff --git a/tests/Report/GitlabTest.php b/tests/Report/GitlabTest.php
index ebe2e26..263421e 100644
--- a/tests/Report/GitlabTest.php
+++ b/tests/Report/GitlabTest.php
@@ -70,7 +70,7 @@ public function testGenerateWithEmpty(): void
     /**
      * @return array<string, array<string>>
      */
-    public function violations(): array
+    public static function violations(): array
     {
         return [
             'single' => ['Single'],