diff --git a/composer.json b/composer.json
index 539bd9a4..fa2a6ca9 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
     "require-dev": {
         "cakephp/authorization": "^3.0",
         "cakephp/cakephp-codesniffer": "^5.0",
-        "phpunit/phpunit": "^10.5.5"
+        "phpunit/phpunit": "^10.5.5 || ^11.1.3"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 52d8b990..36a49710 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -16,7 +16,7 @@ parameters:
 			path: src/Command/BenchmarkCommand.php
 
 		-
-			message: "#^Method DebugKit\\\\Mailer\\\\Transport\\\\DebugKitTransport\\:\\:send\\(\\) should return array\\{headers\\: string, message\\: string\\} but returns array\\{headers\\: non\\-empty\\-array\\<string\\>, message\\: array\\{text\\: string, html\\: string\\}\\}\\.$#"
+			message: "#^Method DebugKit\\\\Mailer\\\\Transport\\\\DebugKitTransport\\:\\:send\\(\\) should return array\\{headers\\: string, message\\: string\\} but returns array\\{headers\\: non\\-empty\\-array\\<string, string\\>, message\\: array\\{text\\: string, html\\: string\\}\\}\\.$#"
 			count: 1
 			path: src/Mailer/Transport/DebugKitTransport.php
 
diff --git a/tests/TestCase/Controller/MailPreviewControllerTest.php b/tests/TestCase/Controller/MailPreviewControllerTest.php
index 841e2e82..ab5617f3 100644
--- a/tests/TestCase/Controller/MailPreviewControllerTest.php
+++ b/tests/TestCase/Controller/MailPreviewControllerTest.php
@@ -15,11 +15,9 @@
  */
 namespace DebugKit\Test\TestCase\Controller;
 
-use Cake\Routing\Router;
 use Cake\TestSuite\IntegrationTestTrait;
 use Cake\TestSuite\TestCase;
 use DebugKit\Test\TestCase\FixtureFactoryTrait;
-use DebugKit\TestApp\Application;
 
 /**
  * Mail preview controller test
@@ -29,18 +27,6 @@ class MailPreviewControllerTest extends TestCase
     use FixtureFactoryTrait;
     use IntegrationTestTrait;
 
-    /**
-     * Setup method.
-     *
-     * @return void
-     */
-    public function setUp(): void
-    {
-        parent::setUp();
-        Router::createRouteBuilder('/')->connect('/users/{action}/*', ['controller' => 'Users']);
-        $this->configApplication(Application::class, []);
-    }
-
     /**
      * Test that plugin is passed to the view in email action
      *
diff --git a/tests/TestCase/Controller/ToolbarControllerTest.php b/tests/TestCase/Controller/ToolbarControllerTest.php
index 7c461faf..dddac6ac 100644
--- a/tests/TestCase/Controller/ToolbarControllerTest.php
+++ b/tests/TestCase/Controller/ToolbarControllerTest.php
@@ -59,10 +59,10 @@ public function testClearCache()
         $mock = $this->getMockBuilder('Cake\Cache\CacheEngine')->getMock();
         $mock->expects($this->once())
             ->method('init')
-            ->will($this->returnValue(true));
+            ->willReturn(true);
         $mock->expects($this->once())
             ->method('clear')
-            ->will($this->returnValue(true));
+            ->willReturn(true);
         Cache::setConfig('testing', $mock);
 
         $this->configRequest(['headers' => ['Accept' => 'application/json']]);
diff --git a/tests/TestCase/Database/Log/DebugLogTest.php b/tests/TestCase/Database/Log/DebugLogTest.php
index 170ba2cf..b60834a6 100644
--- a/tests/TestCase/Database/Log/DebugLogTest.php
+++ b/tests/TestCase/Database/Log/DebugLogTest.php
@@ -17,6 +17,7 @@
 use Cake\Database\Log\LoggedQuery;
 use Cake\TestSuite\TestCase;
 use DebugKit\Database\Log\DebugLog;
+use PHPUnit\Framework\Attributes\DataProvider;
 use Psr\Log\LoggerInterface;
 use Psr\Log\LogLevel;
 
@@ -69,9 +70,9 @@ public function testLog()
     /**
      * Test log ignores schema reflection
      *
-     * @dataProvider schemaQueryProvider
      * @return void
      */
+    #[DataProvider('schemaQueryProvider')]
     public function testLogIgnoreReflection($sql)
     {
         $query = new LoggedQuery();
@@ -90,9 +91,9 @@ public function testLogIgnoreReflection($sql)
     /**
      * Test config setting turns off schema ignores
      *
-     * @dataProvider schemaQueryProvider
      * @return void
      */
+    #[DataProvider('schemaQueryProvider')]
     public function testLogIgnoreReflectionDisabled($sql)
     {
         $query = new LoggedQuery();
diff --git a/tests/TestCase/Mailer/Transport/DebugKitTransportTest.php b/tests/TestCase/Mailer/Transport/DebugKitTransportTest.php
index a32daf8f..8d58f276 100644
--- a/tests/TestCase/Mailer/Transport/DebugKitTransportTest.php
+++ b/tests/TestCase/Mailer/Transport/DebugKitTransportTest.php
@@ -31,10 +31,19 @@ class DebugKitTransportTest extends TestCase
     public function setUp(): void
     {
         $this->log = new ArrayObject();
-        $this->wrapped = $this->getMockBuilder(AbstractTransport::class)
-            ->onlyMethods(['send'])
-            ->addMethods(['customMethod'])
-            ->getMock();
+        $this->wrapped = new class extends AbstractTransport {
+            public string $property;
+
+            public function send(Message $message): array
+            {
+                return [];
+            }
+
+            public function customMethod(): string
+            {
+                return 'bloop';
+            }
+        };
         $this->transport = new DebugKitTransport(
             ['debugKitLog' => $this->log],
             $this->wrapped
@@ -55,8 +64,6 @@ public function testPropertyProxies()
 
     public function testMethodProxy()
     {
-        $this->wrapped->method('customMethod')
-            ->will($this->returnValue('bloop'));
         $this->assertSame('bloop', $this->transport->customMethod());
     }
 
diff --git a/tests/TestCase/Panel/DeprecationsPanelTest.php b/tests/TestCase/Panel/DeprecationsPanelTest.php
index 797007f0..9b81b76c 100644
--- a/tests/TestCase/Panel/DeprecationsPanelTest.php
+++ b/tests/TestCase/Panel/DeprecationsPanelTest.php
@@ -40,6 +40,7 @@ public function setUp(): void
         parent::setUp();
         DeprecationsPanel::clearDeprecatedErrors();
 
+        $this->loadPlugins(['DebugKit']);
         $this->panel = new DeprecationsPanel();
 
         set_error_handler(function ($code, $message, $file, $line, $context = null) {
diff --git a/tests/TestCase/Panel/PackagesPanelTest.php b/tests/TestCase/Panel/PackagesPanelTest.php
index 0f6e5d21..ceaaee23 100644
--- a/tests/TestCase/Panel/PackagesPanelTest.php
+++ b/tests/TestCase/Panel/PackagesPanelTest.php
@@ -17,6 +17,7 @@
 
 use Cake\TestSuite\TestCase;
 use DebugKit\Panel\PackagesPanel;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * Class PackagesPanelTest
@@ -55,9 +56,9 @@ public static function packagesProvider()
     /**
      * test data
      *
-     * @dataProvider packagesProvider
      * @return void
      */
+    #[DataProvider('packagesProvider')]
     public function testData($package)
     {
         $data = $this->panel->data();
diff --git a/tests/TestCase/Panel/VariablesPanelTest.php b/tests/TestCase/Panel/VariablesPanelTest.php
index d163a037..3e4787c0 100644
--- a/tests/TestCase/Panel/VariablesPanelTest.php
+++ b/tests/TestCase/Panel/VariablesPanelTest.php
@@ -69,16 +69,15 @@ public function testShutdown()
         $update = $requests->updateQuery();
         $debugInfoException = $requests->query()->contain('NonExistentAssociation');
 
-        $unserializable = new stdClass();
-        $unserializable->pdo = new PDO('sqlite::memory:');
+        $unserializableDebugInfo = new class extends stdClass {
+            public function __debugInfo()
+            {
+                $unserializable = new stdClass();
+                $unserializable->pdo = new PDO('sqlite::memory:');
 
-        $unserializableDebugInfo = $this
-            ->getMockBuilder('\stdClass')
-            ->addMethods(['__debugInfo'])
-            ->getMock();
-        $unserializableDebugInfo->expects($this->any())->method('__debugInfo')->willReturn([
-            'unserializable' => $unserializable,
-        ]);
+                return ['unserializable' => $unserializable];
+            }
+        };
 
         $resource = fopen('data:text/plain;base64,', 'r');
 
@@ -87,7 +86,7 @@ public function testShutdown()
         };
         $vars = [
             'resource' => $resource,
-            // 'unserializableDebugInfo' => $unserializableDebugInfo,
+            'unserializableDebugInfo' => $unserializableDebugInfo,
             'debugInfoException' => $debugInfoException,
             'updateQuery' => $update,
             'query' => $query,
diff --git a/tests/TestCase/ToolbarServiceTest.php b/tests/TestCase/ToolbarServiceTest.php
index 5bda2582..2922ccab 100644
--- a/tests/TestCase/ToolbarServiceTest.php
+++ b/tests/TestCase/ToolbarServiceTest.php
@@ -26,6 +26,7 @@
 use Cake\TestSuite\TestCase;
 use DebugKit\Model\Entity\Request as RequestEntity;
 use DebugKit\ToolbarService;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * Test the debug bar
@@ -100,7 +101,7 @@ public function testDisablePanels()
         $bar = new ToolbarService($this->events, ['panels' => [
             'DebugKit.SqlLog' => false,
             'DebugKit.Cache' => true,
-            'DebugKit.Session',
+            'DebugKit.Session' => true,
         ]]);
         $bar->loadPanels();
 
@@ -407,9 +408,9 @@ public function testIsEnabled()
      *
      * @param string $domain The domain name where the app is hosted
      * @param bool $isEnabled The expectation for isEnabled()
-     * @dataProvider domainsProvider
      * @return void
      */
+    #[DataProvider('domainsProvider')]
     public function testIsEnabledProductionEnv($domain, $isEnabled)
     {
         Configure::write('debug', true);
diff --git a/tests/TestCase/View/Helper/CredentialsHelperTest.php b/tests/TestCase/View/Helper/CredentialsHelperTest.php
index aaccfc96..904c97dd 100644
--- a/tests/TestCase/View/Helper/CredentialsHelperTest.php
+++ b/tests/TestCase/View/Helper/CredentialsHelperTest.php
@@ -19,6 +19,7 @@
 use Cake\TestSuite\TestCase;
 use Cake\View\View;
 use DebugKit\View\Helper\CredentialsHelper;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * Class CredentialsHelperTestCase
@@ -65,6 +66,7 @@ public function tearDown(): void
      * @dataProvider credentialsProvider
      * @return void
      */
+    #[DataProvider('credentialsProvider')]
     public function testFilter($in, $out)
     {
         $this->assertSame($out, $this->Helper->filter($in));
diff --git a/tests/test_app/Application.php b/tests/test_app/Application.php
index bb99a461..d7f67d29 100644
--- a/tests/test_app/Application.php
+++ b/tests/test_app/Application.php
@@ -20,6 +20,7 @@
 use Cake\Http\MiddlewareQueue;
 use Cake\Routing\Middleware\AssetMiddleware;
 use Cake\Routing\Middleware\RoutingMiddleware;
+use Cake\Routing\RouteBuilder;
 
 /**
  * Application setup class.
@@ -39,6 +40,16 @@ public function bootstrap(): void
         $this->addPlugin('DebugKit');
     }
 
+    /**
+     * @param \Cake\Routing\RouteBuilder $routes
+     * @return void
+     */
+    public function routes(RouteBuilder $routes): void
+    {
+        parent::routes($routes);
+        $routes->connect('/users/{action}/*', ['controller' => 'Users']);
+    }
+
     /**
      * Setup the middleware queue your application will use.
      *