diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index caff662..18a5eae 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -14,7 +14,5 @@ jobs:
             extensions: sockets, grpc
             os: >-
                 ['ubuntu-latest']
-            php: >-
-                ['8.1', '8.2']
             stability: >-
                 ['prefer-stable']
diff --git a/.github/workflows/psalm.yml b/.github/workflows/psalm.yml
index df570fa..e6940e4 100644
--- a/.github/workflows/psalm.yml
+++ b/.github/workflows/psalm.yml
@@ -13,5 +13,3 @@ jobs:
     with:
       os: >-
         ['ubuntu-latest']
-      php: >-
-        ['8.1']
diff --git a/composer.json b/composer.json
index a7c158f..393d0d9 100644
--- a/composer.json
+++ b/composer.json
@@ -29,7 +29,7 @@
   "require-dev": {
     "spiral/framework": "^3.0",
     "spiral/testing": "^2.0",
-    "vimeo/psalm": "^4.9"
+    "vimeo/psalm": "^5.17"
   },
   "autoload": {
     "psr-4": {
diff --git a/psalm.xml b/psalm.xml
index 7c6aaae..0200c83 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -4,6 +4,8 @@
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="https://getpsalm.org/schema/config"
         xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+        findUnusedBaselineEntry="true"
+        findUnusedCode="false"
 >
     <projectFiles>
         <directory name="src" />
diff --git a/src/Attribute/AssignWorker.php b/src/Attribute/AssignWorker.php
index bb73dea..b7f8028 100644
--- a/src/Attribute/AssignWorker.php
+++ b/src/Attribute/AssignWorker.php
@@ -6,6 +6,9 @@
 
 use Spiral\Attributes\NamedArgumentConstructor;
 
+/**
+ * @psalm-suppress DeprecatedClass
+ */
 #[\Attribute(\Attribute::TARGET_CLASS), NamedArgumentConstructor]
 final class AssignWorker
 {
diff --git a/src/Dispatcher.php b/src/Dispatcher.php
index ee2328a..b6db7fa 100644
--- a/src/Dispatcher.php
+++ b/src/Dispatcher.php
@@ -42,6 +42,7 @@ public function serve(): void
         $factory = $this->container->get(WorkerFactoryInterface::class);
         $registry = $this->container->get(WorkersRegistryInterface::class);
 
+        $hasDeclarations = false;
         foreach ($declarations as $type => $declaration) {
             // Worker that listens on a task queue and hosts both workflow and activity implementations.
             $queueName = $this->resolveQueueName($declaration) ?? $this->config->getDefaultWorker();
@@ -60,6 +61,11 @@ public function serve(): void
                     fn(ReflectionClass $class): object => $this->container->make($class->getName()),
                 );
             }
+            $hasDeclarations = true;
+        }
+
+        if (!$hasDeclarations) {
+            $registry->get(WorkerFactoryInterface::DEFAULT_TASK_QUEUE);
         }
 
         // start primary loop
diff --git a/src/Generator/Utils.php b/src/Generator/Utils.php
index f2f3c43..be1efc8 100644
--- a/src/Generator/Utils.php
+++ b/src/Generator/Utils.php
@@ -25,6 +25,7 @@ public static function generateWorkflowSignalMethods(array $signalMethods, Class
         foreach ($signalMethods as $method) {
             $params = null;
             if (\str_contains($method, ',')) {
+                /** @psalm-suppress PossiblyUndefinedArrayOffset */
                 [$method, $params] = \explode(',', $method, 2);
             }
 
@@ -70,10 +71,12 @@ public static function parseMethods(array $methods): array
         foreach ($methods as $method) {
             $params = '';
             if (\str_contains($method, ',')) {
+                /** @psalm-suppress PossiblyUndefinedArrayOffset */
                 [$method, $params] = \explode(',', $method, 2);
             }
 
             if (\str_contains($method, ':')) {
+                /** @psalm-suppress PossiblyUndefinedArrayOffset */
                 [$method, $type] = \explode(':', $method, 2);
             }
 
@@ -100,6 +103,7 @@ public static function parseParameters(array $parameters): array
         foreach ($parameters as $param) {
             $type = null;
             if (\str_contains($param, ':')) {
+                /** @psalm-suppress PossiblyUndefinedArrayOffset */
                 [$param, $type] = \explode(':', $param, 2);
             }
 
diff --git a/tests/src/Commands/MakePresetCommandTest.php b/tests/src/Commands/MakePresetCommandTest.php
index 390f424..ffa10da 100644
--- a/tests/src/Commands/MakePresetCommandTest.php
+++ b/tests/src/Commands/MakePresetCommandTest.php
@@ -16,7 +16,7 @@ final class MakePresetCommandTest extends TestCase
     public function testNotFoundPresetShouldShowErrorMessage(): void
     {
         $this->expectException(PresetNotFoundException::class);
-        $this->expectErrorMessage('Preset with given name [foo] is not defined.');
+        $this->expectExceptionMessage('Preset with given name [foo] is not defined.');
 
         $this->runCommand('temporal:make-preset', ['preset' => 'foo', 'name' => ' bar']);
     }
diff --git a/tests/src/DispatcherTest.php b/tests/src/DispatcherTest.php
index 9851571..75f33b6 100644
--- a/tests/src/DispatcherTest.php
+++ b/tests/src/DispatcherTest.php
@@ -8,7 +8,13 @@
 use Spiral\RoadRunnerBridge\RoadRunnerMode;
 use Spiral\TemporalBridge\Attribute\AssignWorker;
 use Spiral\TemporalBridge\Config\TemporalConfig;
+use Spiral\TemporalBridge\DeclarationLocatorInterface;
 use Spiral\TemporalBridge\Dispatcher;
+use Spiral\TemporalBridge\Tests\App\SomeWorkflow;
+use Spiral\TemporalBridge\WorkersRegistryInterface;
+use Temporal\Worker\WorkerFactoryInterface;
+use Temporal\Worker\WorkerInterface;
+use Temporal\Workflow\WorkflowInterface;
 
 final class DispatcherTest extends TestCase
 {
@@ -60,6 +66,58 @@ public function testResolvingQueueNameWithoutAttribute(): void
 
         $this->assertNull($queue);
     }
+
+    public function testServeWithoutDeclarations(): void
+    {
+        $dispatcher = new Dispatcher(
+            RoadRunnerMode::Temporal,
+            new AttributeReader(),
+            new TemporalConfig(),
+            $this->getContainer(),
+        );
+
+        $locator = $this->mockContainer(DeclarationLocatorInterface::class);
+        $locator->shouldReceive('getDeclarations')->once()->andReturn([]);
+
+        $registry = $this->mockContainer(WorkersRegistryInterface::class);
+        $registry
+            ->shouldReceive('get')
+            ->once()
+            ->with(WorkerFactoryInterface::DEFAULT_TASK_QUEUE)
+            ->andReturn($this->createMock(WorkerInterface::class));
+
+        $factory = $this->mockContainer(WorkerFactoryInterface::class);
+        $factory->shouldReceive('run')->once();
+
+        $dispatcher->serve();
+    }
+
+    public function testServeWithDeclarations(): void
+    {
+        $dispatcher = new Dispatcher(
+            RoadRunnerMode::Temporal,
+            new AttributeReader(),
+            new TemporalConfig(),
+            $this->getContainer(),
+        );
+
+        $locator = $this->mockContainer(DeclarationLocatorInterface::class);
+        $locator->shouldReceive('getDeclarations')->once()->andReturn([
+            WorkflowInterface::class => new \ReflectionClass(SomeWorkflow::class),
+        ]);
+
+        $registry = $this->mockContainer(WorkersRegistryInterface::class);
+        $registry
+            ->shouldReceive('get')
+            ->once()
+            ->with('worker2')
+            ->andReturn($this->createMock(WorkerInterface::class));
+
+        $factory = $this->mockContainer(WorkerFactoryInterface::class);
+        $factory->shouldReceive('run')->once();
+
+        $dispatcher->serve();
+    }
 }
 
 #[AssignWorker(name: 'worker1')]
diff --git a/tests/src/Generator/PhpCodePrinterTest.php b/tests/src/Generator/PhpCodePrinterTest.php
index 16dafa6..37e4155 100644
--- a/tests/src/Generator/PhpCodePrinterTest.php
+++ b/tests/src/Generator/PhpCodePrinterTest.php
@@ -14,8 +14,11 @@ final class PhpCodePrinterTest extends TestCase
 {
     public function testPrint(): void
     {
+        $namespace = new PhpNamespace('Foo\\Bar');
+        $namespace->addClass('Baz');
+
         $printer = new PhpCodePrinter(
-            new PhpNamespace('Foo\\Bar'),
+            $namespace,
             new Context('src/app/', 'App//Foo', 'Bar')
         );
 
@@ -28,6 +31,9 @@ public function testPrint(): void
 
 namespace Foo\Bar;
 
+class Baz
+{
+}
 
 CODE
 , null, true);
diff --git a/tests/src/Preset/PresetRegistryTest.php b/tests/src/Preset/PresetRegistryTest.php
index 9de2db6..c498c17 100644
--- a/tests/src/Preset/PresetRegistryTest.php
+++ b/tests/src/Preset/PresetRegistryTest.php
@@ -27,7 +27,7 @@ public function testRegister(): void
     public function testNotFoundPresetShouldThrowAnException(): void
     {
         $this->expectException(PresetNotFoundException::class);
-        $this->expectErrorMessage('Preset with given name [foo] is not defined.');
+        $this->expectExceptionMessage('Preset with given name [foo] is not defined.');
 
         $registry = new PresetRegistry();
 
diff --git a/tests/src/WorkersRegistryTest.php b/tests/src/WorkersRegistryTest.php
index 1b5879a..e725998 100644
--- a/tests/src/WorkersRegistryTest.php
+++ b/tests/src/WorkersRegistryTest.php
@@ -40,7 +40,7 @@ public function testRegisterWorker(): void
     public function testRegisterWorkerWithExistsName(): void
     {
         $this->expectException(WorkersRegistryException::class);
-        $this->expectErrorMessage('Temporal worker with given name `foo` has already been registered.');
+        $this->expectExceptionMessage('Temporal worker with given name `foo` has already been registered.');
 
         $registry = new WorkersRegistry(
             $this->createMock(WorkerFactoryInterface::class),