diff --git a/CHANGELOG.md b/CHANGELOG.md
index 670c66f..25955cb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## v0.31.1
+
+### Added
+
+- Use PHPUnit 11 attributes for testing helpers
+
 ## v0.31.0
 
 ### Fixed
diff --git a/composer.json b/composer.json
index 134f8de..c60139a 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     "webonyx/graphql-php": "^14.11.3 || ^15"
   },
   "require-dev": {
-    "bensampo/laravel-enum": "^3 || ^4.1",
+    "bensampo/laravel-enum": "^3 || ^4.1 || ^5 || ^6",
     "composer/composer": "^2",
     "ergebnis/composer-normalize": "^2.13",
     "guzzlehttp/guzzle": "^7",
@@ -37,11 +37,10 @@
     "php-http/mock-client": "^1.4",
     "phpstan/extension-installer": "^1",
     "phpstan/phpstan": "^1",
-    "phpstan/phpstan-deprecation-rules": "^1",
     "phpstan/phpstan-mockery": "^1",
     "phpstan/phpstan-phpunit": "^1",
     "phpstan/phpstan-strict-rules": "^1",
-    "phpunit/phpunit": "^9.5.2",
+    "phpunit/phpunit": "^9.5.2 || ^10 || ^11",
     "spawnia/phpunit-assert-directory": "^2",
     "symfony/var-dumper": "^5.2.3",
     "thecodingmachine/phpstan-safe-rule": "^1.1"
diff --git a/phpstan.neon b/phpstan.neon
index e715e2c..b697bd4 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -10,9 +10,20 @@ parameters:
   - src
   - tests
   tmpDir: .build/phpstan
+  reportUnmatchedIgnoredErrors: false # As long as we support multiple PHP versions at once, there will be some dead spots
   ignoreErrors:
+  # Required in different versions
   - '#Call to deprecated method getNamespace\(\) of class Nette\\PhpGenerator\\ClassType#'
+  # Necessary when calling into generated client code, we know how it looks like
   - '#Unsafe usage of new static.*#'
+  # @property on interfaces or abstract classes
+  - '#Access to an undefined property GraphQL\\Type\\Definition\\NamedType&GraphQL\\Type\\Definition\\Type::\$name\.#'
+  - '#Access to an undefined property Spawnia\\Sailor\\Result::\$data\.#'
+  - '#Access to an undefined property Spawnia\\Sailor\\ErrorFreeResult::\$data\.#'
+  # Due to different versions of bensampo/laravel-enum
+  - '#extends generic class BenSampo\\Enum\\Enum but does not specify its types: TValue#'
+  # Due to different versions of PHPUnit, attributes are backwards-compatible though
+  - '#Attribute class PHPUnit\\Framework\\Attributes\\After does not exist\.#'
   # Due to the workaround with ObjectLike::UNDEFINED
   - '#Default value of the parameter .+ \(string\) of method .+::make\(\) is incompatible with type .+#'
   - '#Default value of the parameter .+ \(string\) of method .+::execute\(\) is incompatible with type .+#'
diff --git a/src/Operation.php b/src/Operation.php
index 4ccce20..677eb5f 100644
--- a/src/Operation.php
+++ b/src/Operation.php
@@ -68,7 +68,7 @@ protected static function executeOperation(...$args): Result
     /**
      * Send an operation through the client and return the response.
      *
-     * @param  array<int, mixed>  $args
+     * @param  array<mixed>  $args
      */
     protected static function fetchResponse(array $args): Response
     {
@@ -87,7 +87,7 @@ protected static function fetchResponse(array $args): Response
         return $response;
     }
 
-    /** @param array<int, mixed> $args */
+    /** @param array<mixed> $args */
     protected static function variables(array $args): \stdClass
     {
         $variables = new \stdClass();
diff --git a/src/Testing/ClearsSailorClients.php b/src/Testing/ClearsSailorClients.php
index 13bbc92..db0ce3b 100644
--- a/src/Testing/ClearsSailorClients.php
+++ b/src/Testing/ClearsSailorClients.php
@@ -2,11 +2,13 @@
 
 namespace Spawnia\Sailor\Testing;
 
+use PHPUnit\Framework\Attributes\After;
 use Spawnia\Sailor\Operation;
 
 trait ClearsSailorClients
 {
     /** @after */
+    #[After]
     protected function tearDownSailorClients(): void
     {
         Operation::clearClients();
diff --git a/src/Testing/UsesSailorMocks.php b/src/Testing/UsesSailorMocks.php
index 9619ea1..935e456 100644
--- a/src/Testing/UsesSailorMocks.php
+++ b/src/Testing/UsesSailorMocks.php
@@ -2,11 +2,13 @@
 
 namespace Spawnia\Sailor\Testing;
 
+use PHPUnit\Framework\Attributes\After;
 use Spawnia\Sailor\Operation;
 
 trait UsesSailorMocks
 {
     /** @after */
+    #[After]
     protected function tearDownSailorMocks(): void
     {
         Operation::clearMocks();
diff --git a/tests/Unit/IntrospectorTest.php b/tests/Unit/IntrospectorTest.php
index cb33ec9..c9bfb67 100644
--- a/tests/Unit/IntrospectorTest.php
+++ b/tests/Unit/IntrospectorTest.php
@@ -56,7 +56,7 @@ public function testFailsIntrospectionIfFallbackAlsoThrows(): void
     }
 
     /** @return iterable<array{Request}> */
-    public function validRequests(): iterable
+    public static function validRequests(): iterable
     {
         yield [
             static fn (): Response => self::successfulIntrospectionMock(),
diff --git a/tests/Unit/ResultTest.php b/tests/Unit/ResultTest.php
index 850e01d..4231992 100644
--- a/tests/Unit/ResultTest.php
+++ b/tests/Unit/ResultTest.php
@@ -41,7 +41,7 @@ public function testThrowErrors(bool $isClientSafe): void
     }
 
     /** @return iterable<array{bool}> */
-    public function isClientSafe(): iterable
+    public static function isClientSafe(): iterable
     {
         yield [true];
         yield [false];