diff --git a/rector.php b/rector.php
index 1b4259ec..27c4687d 100644
--- a/rector.php
+++ b/rector.php
@@ -10,7 +10,7 @@
 use Rector\Symfony\Set\SymfonySetList;
 
 return static function (RectorConfig $rectorConfig): void {
-    $rectorConfig->phpVersion(phpVersion: PhpVersion::PHP_80);
+    $rectorConfig->phpVersion(phpVersion: PhpVersion::PHP_81);
     $rectorConfig->importNames();
     $rectorConfig->importShortClasses();
     $rectorConfig->parallel(seconds: 600, maxNumberOfProcess: 32);
@@ -54,6 +54,7 @@
         SetList::PHP_73,
         SetList::PHP_74,
         SetList::PHP_80,
+        SetList::PHP_81,
         SetList::UNWRAP_COMPAT,
     ]);
 
diff --git a/src/Bridge/Doctrine/Connection/AbstractDoctrineConnection.php b/src/Bridge/Doctrine/Connection/AbstractDoctrineConnection.php
index 311a0a75..bf80c822 100644
--- a/src/Bridge/Doctrine/Connection/AbstractDoctrineConnection.php
+++ b/src/Bridge/Doctrine/Connection/AbstractDoctrineConnection.php
@@ -16,7 +16,7 @@
  */
 abstract class AbstractDoctrineConnection
 {
-    public function __construct(private DBALConnection $driverConnection)
+    public function __construct(private readonly DBALConnection $driverConnection)
     {
     }
 
diff --git a/src/Bridge/Doctrine/Transport/Configuration/DoctrineConfigurationFactory.php b/src/Bridge/Doctrine/Transport/Configuration/DoctrineConfigurationFactory.php
index c830e027..9af1dd7b 100644
--- a/src/Bridge/Doctrine/Transport/Configuration/DoctrineConfigurationFactory.php
+++ b/src/Bridge/Doctrine/Transport/Configuration/DoctrineConfigurationFactory.php
@@ -19,7 +19,7 @@
  */
 final class DoctrineConfigurationFactory implements ConfigurationFactoryInterface
 {
-    public function __construct(private ConnectionRegistry $registry)
+    public function __construct(private readonly ConnectionRegistry $registry)
     {
     }
 
diff --git a/src/Bridge/Doctrine/Transport/DoctrineTransportFactory.php b/src/Bridge/Doctrine/Transport/DoctrineTransportFactory.php
index 74b6104a..8232d07a 100644
--- a/src/Bridge/Doctrine/Transport/DoctrineTransportFactory.php
+++ b/src/Bridge/Doctrine/Transport/DoctrineTransportFactory.php
@@ -21,7 +21,7 @@
  */
 final class DoctrineTransportFactory implements TransportFactoryInterface
 {
-    public function __construct(private ConnectionRegistry $registry)
+    public function __construct(private readonly ConnectionRegistry $registry)
     {
     }
 
diff --git a/src/Bridge/Redis/Transport/Connection.php b/src/Bridge/Redis/Transport/Connection.php
index 2a38dba3..8e9879ec 100644
--- a/src/Bridge/Redis/Transport/Connection.php
+++ b/src/Bridge/Redis/Transport/Connection.php
@@ -27,13 +27,13 @@ final class Connection implements ConnectionInterface
 
     public function __construct(
         ConfigurationInterface $configuration,
-        private SerializerInterface $serializer,
+        private readonly SerializerInterface $serializer,
         ?Redis $redis = null
     ) {
         $this->connection = $redis ?? new Redis();
         $this->connection->connect($configuration->get('host'), $configuration->get('port'), $configuration->get('timeout'));
 
-        if (!str_starts_with($this->list = $configuration->get('list'), '_')) {
+        if (!str_starts_with((string) ($this->list = $configuration->get('list')), '_')) {
             throw new InvalidArgumentException('The list name must start with an underscore');
         }
 
diff --git a/src/Command/ConsumeTasksCommand.php b/src/Command/ConsumeTasksCommand.php
index d9aa08de..d65ac57e 100644
--- a/src/Command/ConsumeTasksCommand.php
+++ b/src/Command/ConsumeTasksCommand.php
@@ -41,12 +41,12 @@
 )]
 final class ConsumeTasksCommand extends Command
 {
-    private LoggerInterface $logger;
+    private readonly LoggerInterface $logger;
 
     public function __construct(
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker,
-        private EventDispatcherInterface $eventDispatcher,
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker,
+        private readonly EventDispatcherInterface $eventDispatcher,
         LoggerInterface $logger = null
     ) {
         $this->logger = $logger ?? new NullLogger();
diff --git a/src/Command/DebugConfigurationCommand.php b/src/Command/DebugConfigurationCommand.php
index 82c8fdf1..b957e9f1 100644
--- a/src/Command/DebugConfigurationCommand.php
+++ b/src/Command/DebugConfigurationCommand.php
@@ -22,7 +22,7 @@
 )]
 final class DebugConfigurationCommand extends Command
 {
-    public function __construct(private ConfigurationInterface $configuration)
+    public function __construct(private readonly ConfigurationInterface $configuration)
     {
         parent::__construct();
     }
diff --git a/src/Command/DebugMiddlewareCommand.php b/src/Command/DebugMiddlewareCommand.php
index 0a81c748..1f3abdc4 100644
--- a/src/Command/DebugMiddlewareCommand.php
+++ b/src/Command/DebugMiddlewareCommand.php
@@ -33,8 +33,8 @@
 final class DebugMiddlewareCommand extends Command
 {
     public function __construct(
-        private SchedulerMiddlewareStackInterface $schedulerMiddlewareStack,
-        private WorkerMiddlewareStackInterface $workerMiddlewareStack
+        private readonly SchedulerMiddlewareStackInterface $schedulerMiddlewareStack,
+        private readonly WorkerMiddlewareStackInterface $workerMiddlewareStack
     ) {
         parent::__construct();
     }
diff --git a/src/Command/DebugProbeCommand.php b/src/Command/DebugProbeCommand.php
index d049ee5a..58698858 100644
--- a/src/Command/DebugProbeCommand.php
+++ b/src/Command/DebugProbeCommand.php
@@ -29,8 +29,8 @@
 final class DebugProbeCommand extends Command
 {
     public function __construct(
-        private ProbeInterface $probe,
-        private SchedulerInterface $scheduler
+        private readonly ProbeInterface $probe,
+        private readonly SchedulerInterface $scheduler
     ) {
         parent::__construct();
     }
diff --git a/src/Command/ExecuteExternalProbeCommand.php b/src/Command/ExecuteExternalProbeCommand.php
index dea7c5b3..9d085132 100644
--- a/src/Command/ExecuteExternalProbeCommand.php
+++ b/src/Command/ExecuteExternalProbeCommand.php
@@ -28,8 +28,8 @@
 final class ExecuteExternalProbeCommand extends Command
 {
     public function __construct(
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker
     ) {
         parent::__construct();
     }
diff --git a/src/Command/ExecuteTaskCommand.php b/src/Command/ExecuteTaskCommand.php
index e84e5ce8..8db9e100 100644
--- a/src/Command/ExecuteTaskCommand.php
+++ b/src/Command/ExecuteTaskCommand.php
@@ -41,16 +41,12 @@
 )]
 final class ExecuteTaskCommand extends Command
 {
-    private LoggerInterface $logger;
-
     public function __construct(
-        private EventDispatcherInterface $eventDispatcher,
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker,
-        ?LoggerInterface $logger = null
+        private readonly EventDispatcherInterface $eventDispatcher,
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker,
+        private readonly LoggerInterface $logger = new NullLogger()
     ) {
-        $this->logger = $logger ?? new NullLogger();
-
         parent::__construct();
     }
 
diff --git a/src/Command/ListFailedTasksCommand.php b/src/Command/ListFailedTasksCommand.php
index 0d80a7f4..7ceb01a6 100644
--- a/src/Command/ListFailedTasksCommand.php
+++ b/src/Command/ListFailedTasksCommand.php
@@ -25,7 +25,7 @@
 )]
 final class ListFailedTasksCommand extends Command
 {
-    public function __construct(private WorkerInterface $worker)
+    public function __construct(private readonly WorkerInterface $worker)
     {
         parent::__construct();
     }
diff --git a/src/Command/ListTasksCommand.php b/src/Command/ListTasksCommand.php
index c79848a4..2b93bf09 100644
--- a/src/Command/ListTasksCommand.php
+++ b/src/Command/ListTasksCommand.php
@@ -39,7 +39,7 @@ final class ListTasksCommand extends Command
     /**
      * {@inheritdoc}
      */
-    public function __construct(private SchedulerInterface $scheduler)
+    public function __construct(private readonly SchedulerInterface $scheduler)
     {
         parent::__construct();
     }
diff --git a/src/Command/RebootSchedulerCommand.php b/src/Command/RebootSchedulerCommand.php
index 801016b3..573a1aea 100644
--- a/src/Command/RebootSchedulerCommand.php
+++ b/src/Command/RebootSchedulerCommand.php
@@ -32,16 +32,12 @@
 )]
 final class RebootSchedulerCommand extends Command
 {
-    private LoggerInterface $logger;
-
     public function __construct(
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker,
-        private EventDispatcherInterface $eventDispatcher,
-        ?LoggerInterface $logger = null
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker,
+        private readonly EventDispatcherInterface $eventDispatcher,
+        private readonly LoggerInterface $logger = new NullLogger()
     ) {
-        $this->logger = $logger ?? new NullLogger();
-
         parent::__construct();
     }
 
diff --git a/src/Command/RemoveFailedTaskCommand.php b/src/Command/RemoveFailedTaskCommand.php
index 3724eeef..a81fff9b 100644
--- a/src/Command/RemoveFailedTaskCommand.php
+++ b/src/Command/RemoveFailedTaskCommand.php
@@ -31,8 +31,8 @@
 final class RemoveFailedTaskCommand extends Command
 {
     public function __construct(
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker
     ) {
         parent::__construct();
     }
diff --git a/src/Command/RetryFailedTaskCommand.php b/src/Command/RetryFailedTaskCommand.php
index 1ed0e464..4bf086c7 100644
--- a/src/Command/RetryFailedTaskCommand.php
+++ b/src/Command/RetryFailedTaskCommand.php
@@ -34,11 +34,11 @@
 )]
 final class RetryFailedTaskCommand extends Command
 {
-    private LoggerInterface $logger;
+    private readonly LoggerInterface $logger;
 
     public function __construct(
-        private WorkerInterface $worker,
-        private EventDispatcherInterface $eventDispatcher,
+        private readonly WorkerInterface $worker,
+        private readonly EventDispatcherInterface $eventDispatcher,
         LoggerInterface $logger = null
     ) {
         $this->logger = $logger ?? new NullLogger();
diff --git a/src/Command/YieldTaskCommand.php b/src/Command/YieldTaskCommand.php
index d83d1781..af07a5da 100644
--- a/src/Command/YieldTaskCommand.php
+++ b/src/Command/YieldTaskCommand.php
@@ -27,7 +27,7 @@
 )]
 final class YieldTaskCommand extends Command
 {
-    public function __construct(private SchedulerInterface $scheduler)
+    public function __construct(private readonly SchedulerInterface $scheduler)
     {
         parent::__construct();
     }
diff --git a/src/DataCollector/SchedulerDataCollector.php b/src/DataCollector/SchedulerDataCollector.php
index c7a90d3c..f5d74e3f 100644
--- a/src/DataCollector/SchedulerDataCollector.php
+++ b/src/DataCollector/SchedulerDataCollector.php
@@ -25,11 +25,11 @@ final class SchedulerDataCollector extends DataCollector implements LateDataColl
      */
     public const NAME = 'scheduler';
 
-    private TaskEventList $events;
+    private readonly TaskEventList $events;
 
     public function __construct(
         TaskLoggerSubscriber $taskLoggerSubscriber,
-        private ?ProbeInterface $probe = null
+        private readonly ?ProbeInterface $probe = null
     ) {
         $this->events = $taskLoggerSubscriber->getEvents();
     }
diff --git a/src/DependencyInjection/SchedulerPass.php b/src/DependencyInjection/SchedulerPass.php
index 23de8600..08dda006 100644
--- a/src/DependencyInjection/SchedulerPass.php
+++ b/src/DependencyInjection/SchedulerPass.php
@@ -17,8 +17,8 @@
 final class SchedulerPass implements CompilerPassInterface
 {
     public function __construct(
-        private string $schedulerExtraTag = 'scheduler.extra',
-        private string $schedulerEntryPointTag = 'scheduler.entry_point'
+        private readonly string $schedulerExtraTag = 'scheduler.extra',
+        private readonly string $schedulerEntryPointTag = 'scheduler.entry_point'
     ) {
     }
 
diff --git a/src/Event/SchedulerRebootedEvent.php b/src/Event/SchedulerRebootedEvent.php
index fd8d401d..3943f46a 100644
--- a/src/Event/SchedulerRebootedEvent.php
+++ b/src/Event/SchedulerRebootedEvent.php
@@ -12,7 +12,7 @@
  */
 final class SchedulerRebootedEvent extends Event
 {
-    public function __construct(private SchedulerInterface $scheduler)
+    public function __construct(private readonly SchedulerInterface $scheduler)
     {
     }
 
diff --git a/src/Event/TaskExecutedEvent.php b/src/Event/TaskExecutedEvent.php
index d595eaf6..40546dd9 100644
--- a/src/Event/TaskExecutedEvent.php
+++ b/src/Event/TaskExecutedEvent.php
@@ -13,7 +13,7 @@
  */
 final class TaskExecutedEvent extends Event implements TaskEventInterface
 {
-    public function __construct(private TaskInterface $task, private Output $output)
+    public function __construct(private readonly TaskInterface $task, private readonly Output $output)
     {
     }
 
diff --git a/src/Event/TaskExecutingEvent.php b/src/Event/TaskExecutingEvent.php
index 21fa9db5..cb47cf56 100644
--- a/src/Event/TaskExecutingEvent.php
+++ b/src/Event/TaskExecutingEvent.php
@@ -14,7 +14,7 @@
  */
 final class TaskExecutingEvent extends Event implements TaskEventInterface, WorkerEventInterface
 {
-    public function __construct(private TaskInterface $task, private WorkerInterface $worker, private TaskListInterface $currentTasks)
+    public function __construct(private readonly TaskInterface $task, private readonly WorkerInterface $worker, private readonly TaskListInterface $currentTasks)
     {
     }
 
diff --git a/src/Event/TaskFailedEvent.php b/src/Event/TaskFailedEvent.php
index 7c7fd142..b8518b67 100644
--- a/src/Event/TaskFailedEvent.php
+++ b/src/Event/TaskFailedEvent.php
@@ -12,7 +12,7 @@
  */
 final class TaskFailedEvent extends Event implements TaskEventInterface
 {
-    public function __construct(private FailedTask $task)
+    public function __construct(private readonly FailedTask $task)
     {
     }
 
diff --git a/src/Event/TaskScheduledEvent.php b/src/Event/TaskScheduledEvent.php
index 7893b21f..1fbd4702 100644
--- a/src/Event/TaskScheduledEvent.php
+++ b/src/Event/TaskScheduledEvent.php
@@ -12,7 +12,7 @@
  */
 final class TaskScheduledEvent extends Event implements TaskEventInterface
 {
-    public function __construct(private TaskInterface $task)
+    public function __construct(private readonly TaskInterface $task)
     {
     }
 
diff --git a/src/Event/TaskUnscheduledEvent.php b/src/Event/TaskUnscheduledEvent.php
index fc214dbb..b17b7fe0 100644
--- a/src/Event/TaskUnscheduledEvent.php
+++ b/src/Event/TaskUnscheduledEvent.php
@@ -11,7 +11,7 @@
  */
 final class TaskUnscheduledEvent extends Event implements TaskEventInterface
 {
-    public function __construct(private string $task)
+    public function __construct(private readonly string $task)
     {
     }
 
diff --git a/src/Event/WorkerForkedEvent.php b/src/Event/WorkerForkedEvent.php
index 35ca24c5..081fa3b3 100644
--- a/src/Event/WorkerForkedEvent.php
+++ b/src/Event/WorkerForkedEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerForkedEvent extends Event
 {
-    public function __construct(private WorkerInterface $forkedWorker, private WorkerInterface $newWorker)
+    public function __construct(private readonly WorkerInterface $forkedWorker, private readonly WorkerInterface $newWorker)
     {
     }
 
diff --git a/src/Event/WorkerPausedEvent.php b/src/Event/WorkerPausedEvent.php
index 80b7c6fa..cf89306c 100644
--- a/src/Event/WorkerPausedEvent.php
+++ b/src/Event/WorkerPausedEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerPausedEvent extends Event
 {
-    public function __construct(private WorkerInterface $worker)
+    public function __construct(private readonly WorkerInterface $worker)
     {
     }
 
diff --git a/src/Event/WorkerRestartedEvent.php b/src/Event/WorkerRestartedEvent.php
index 340bac95..9ccce7c2 100644
--- a/src/Event/WorkerRestartedEvent.php
+++ b/src/Event/WorkerRestartedEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerRestartedEvent extends Event
 {
-    public function __construct(private WorkerInterface $worker)
+    public function __construct(private readonly WorkerInterface $worker)
     {
     }
 
diff --git a/src/Event/WorkerRunningEvent.php b/src/Event/WorkerRunningEvent.php
index bc67e0f0..20ae1434 100644
--- a/src/Event/WorkerRunningEvent.php
+++ b/src/Event/WorkerRunningEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerRunningEvent extends Event implements WorkerEventInterface
 {
-    public function __construct(private WorkerInterface $worker, private bool $isIdle = false)
+    public function __construct(private readonly WorkerInterface $worker, private readonly bool $isIdle = false)
     {
     }
 
diff --git a/src/Event/WorkerSleepingEvent.php b/src/Event/WorkerSleepingEvent.php
index c8fb3518..d517eab3 100644
--- a/src/Event/WorkerSleepingEvent.php
+++ b/src/Event/WorkerSleepingEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerSleepingEvent extends Event implements WorkerEventInterface
 {
-    public function __construct(private int $sleepDuration, private WorkerInterface $worker)
+    public function __construct(private readonly int $sleepDuration, private readonly WorkerInterface $worker)
     {
     }
 
diff --git a/src/Event/WorkerStartedEvent.php b/src/Event/WorkerStartedEvent.php
index 5ab07a4e..0ac13fab 100644
--- a/src/Event/WorkerStartedEvent.php
+++ b/src/Event/WorkerStartedEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerStartedEvent extends Event implements WorkerEventInterface
 {
-    public function __construct(private WorkerInterface $worker)
+    public function __construct(private readonly WorkerInterface $worker)
     {
     }
 
diff --git a/src/Event/WorkerStoppedEvent.php b/src/Event/WorkerStoppedEvent.php
index 642916ed..b304769d 100644
--- a/src/Event/WorkerStoppedEvent.php
+++ b/src/Event/WorkerStoppedEvent.php
@@ -12,7 +12,7 @@
  */
 final class WorkerStoppedEvent extends Event
 {
-    public function __construct(private WorkerInterface $worker)
+    public function __construct(private readonly WorkerInterface $worker)
     {
     }
 
diff --git a/src/EventListener/ProbeStateSubscriber.php b/src/EventListener/ProbeStateSubscriber.php
index acbad8e9..b2daa696 100644
--- a/src/EventListener/ProbeStateSubscriber.php
+++ b/src/EventListener/ProbeStateSubscriber.php
@@ -19,7 +19,7 @@
  */
 final class ProbeStateSubscriber implements EventSubscriberInterface
 {
-    public function __construct(private ProbeInterface $probe, private string $path = '/_probe')
+    public function __construct(private readonly ProbeInterface $probe, private readonly string $path = '/_probe')
     {
     }
 
diff --git a/src/EventListener/StopWorkerOnFailureLimitSubscriber.php b/src/EventListener/StopWorkerOnFailureLimitSubscriber.php
index 680b8e68..ffe5e75f 100644
--- a/src/EventListener/StopWorkerOnFailureLimitSubscriber.php
+++ b/src/EventListener/StopWorkerOnFailureLimitSubscriber.php
@@ -17,15 +17,12 @@
  */
 final class StopWorkerOnFailureLimitSubscriber implements EventSubscriberInterface
 {
-    private LoggerInterface $logger;
     private int $failedTasks = 0;
 
     public function __construct(
-        private int $maximumFailedTasks,
-        ?LoggerInterface $logger = null
+        private readonly int $maximumFailedTasks,
+        private readonly LoggerInterface $logger = new NullLogger()
     ) {
-        $this->logger = $logger ?? new NullLogger();
-
         if ($maximumFailedTasks <= 0) {
             throw new InvalidArgumentException(sprintf('The failure limit must be greater than 0, given %d', $maximumFailedTasks));
         }
diff --git a/src/EventListener/StopWorkerOnSignalSubscriber.php b/src/EventListener/StopWorkerOnSignalSubscriber.php
index f1c3a30c..8793864e 100644
--- a/src/EventListener/StopWorkerOnSignalSubscriber.php
+++ b/src/EventListener/StopWorkerOnSignalSubscriber.php
@@ -26,11 +26,8 @@
  */
 final class StopWorkerOnSignalSubscriber implements EventSubscriberInterface
 {
-    private LoggerInterface $logger;
-
-    public function __construct(?LoggerInterface $logger = null)
+    public function __construct(private readonly LoggerInterface $logger = new NullLogger())
     {
-        $this->logger = $logger ?? new NullLogger();
     }
 
     public function onTaskExecuting(TaskExecutingEvent $taskExecutingEvent): void
diff --git a/src/EventListener/StopWorkerOnTaskLimitSubscriber.php b/src/EventListener/StopWorkerOnTaskLimitSubscriber.php
index 9eaa3415..7c27c3a9 100644
--- a/src/EventListener/StopWorkerOnTaskLimitSubscriber.php
+++ b/src/EventListener/StopWorkerOnTaskLimitSubscriber.php
@@ -15,13 +15,9 @@
 final class StopWorkerOnTaskLimitSubscriber implements EventSubscriberInterface
 {
     private int $consumedTasks = 0;
-    private LoggerInterface $logger;
 
-    public function __construct(
-        private int $maximumTasks,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly int $maximumTasks, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     public function onWorkerRunning(WorkerRunningEvent $workerRunningEvent): void
diff --git a/src/EventListener/StopWorkerOnTimeLimitSubscriber.php b/src/EventListener/StopWorkerOnTimeLimitSubscriber.php
index 2961b024..8645ac0c 100644
--- a/src/EventListener/StopWorkerOnTimeLimitSubscriber.php
+++ b/src/EventListener/StopWorkerOnTimeLimitSubscriber.php
@@ -19,13 +19,9 @@
 final class StopWorkerOnTimeLimitSubscriber implements EventSubscriberInterface
 {
     private ?float $endTime = null;
-    private LoggerInterface $logger;
 
-    public function __construct(
-        private int $timeLimitInSeconds,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly int $timeLimitInSeconds, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     public function onWorkerStarted(): void
diff --git a/src/EventListener/TaskLifecycleSubscriber.php b/src/EventListener/TaskLifecycleSubscriber.php
index 595ebe48..b44eacdd 100644
--- a/src/EventListener/TaskLifecycleSubscriber.php
+++ b/src/EventListener/TaskLifecycleSubscriber.php
@@ -17,7 +17,7 @@
  */
 final class TaskLifecycleSubscriber implements EventSubscriberInterface
 {
-    private LoggerInterface $logger;
+    private readonly LoggerInterface $logger;
 
     public function __construct(LoggerInterface $logger = null)
     {
diff --git a/src/EventListener/TaskLoggerSubscriber.php b/src/EventListener/TaskLoggerSubscriber.php
index ab5bbc75..0e083ea1 100644
--- a/src/EventListener/TaskLoggerSubscriber.php
+++ b/src/EventListener/TaskLoggerSubscriber.php
@@ -18,7 +18,7 @@
  */
 final class TaskLoggerSubscriber implements EventSubscriberInterface
 {
-    private TaskEventList $events;
+    private readonly TaskEventList $events;
 
     public function __construct()
     {
diff --git a/src/Expression/ExpressionBuilder.php b/src/Expression/ExpressionBuilder.php
index b4a99a97..2fa24140 100644
--- a/src/Expression/ExpressionBuilder.php
+++ b/src/Expression/ExpressionBuilder.php
@@ -15,7 +15,7 @@ final class ExpressionBuilder implements BuilderInterface
     /**
      * @param iterable|ExpressionBuilderInterface[] $builders
      */
-    public function __construct(private iterable $builders)
+    public function __construct(private readonly iterable $builders)
     {
     }
 
diff --git a/src/Fiber/AbstractFiberHandler.php b/src/Fiber/AbstractFiberHandler.php
index b26f9e7a..e3d2242a 100644
--- a/src/Fiber/AbstractFiberHandler.php
+++ b/src/Fiber/AbstractFiberHandler.php
@@ -16,7 +16,7 @@
  */
 abstract class AbstractFiberHandler
 {
-    private LoggerInterface $logger;
+    private readonly LoggerInterface $logger;
 
     public function __construct(?LoggerInterface $logger = null)
     {
diff --git a/src/HttpScheduler.php b/src/HttpScheduler.php
index 270a3c84..8f23edaa 100644
--- a/src/HttpScheduler.php
+++ b/src/HttpScheduler.php
@@ -24,9 +24,9 @@
 final class HttpScheduler implements SchedulerInterface
 {
     public function __construct(
-        private string $externalSchedulerEndpoint,
-        private SerializerInterface $serializer,
-        private HttpClientInterface $httpClient
+        private readonly string $externalSchedulerEndpoint,
+        private readonly SerializerInterface $serializer,
+        private readonly HttpClientInterface $httpClient
     ) {
     }
 
diff --git a/src/LazyScheduler.php b/src/LazyScheduler.php
index d895bcdc..72068b94 100644
--- a/src/LazyScheduler.php
+++ b/src/LazyScheduler.php
@@ -20,7 +20,7 @@ final class LazyScheduler implements SchedulerInterface, LazyInterface
     private SchedulerInterface $scheduler;
     private bool $initialized = false;
 
-    public function __construct(private SchedulerInterface $sourceScheduler)
+    public function __construct(private readonly SchedulerInterface $sourceScheduler)
     {
     }
 
diff --git a/src/Messenger/TaskToExecuteMessage.php b/src/Messenger/TaskToExecuteMessage.php
index fbb64ac5..168a4132 100644
--- a/src/Messenger/TaskToExecuteMessage.php
+++ b/src/Messenger/TaskToExecuteMessage.php
@@ -12,8 +12,8 @@
 final class TaskToExecuteMessage
 {
     public function __construct(
-        private TaskInterface $task,
-        private int $workerTimeout = 1
+        private readonly TaskInterface $task,
+        private readonly int $workerTimeout = 1
     ) {
     }
 
diff --git a/src/Messenger/TaskToPauseMessage.php b/src/Messenger/TaskToPauseMessage.php
index 2dc52e19..c37d7a65 100644
--- a/src/Messenger/TaskToPauseMessage.php
+++ b/src/Messenger/TaskToPauseMessage.php
@@ -9,7 +9,7 @@
  */
 final class TaskToPauseMessage
 {
-    public function __construct(private string $task)
+    public function __construct(private readonly string $task)
     {
     }
 
diff --git a/src/Messenger/TaskToUpdateMessage.php b/src/Messenger/TaskToUpdateMessage.php
index af7641b9..1625f6c9 100644
--- a/src/Messenger/TaskToUpdateMessage.php
+++ b/src/Messenger/TaskToUpdateMessage.php
@@ -11,7 +11,7 @@
  */
 final class TaskToUpdateMessage
 {
-    public function __construct(private string $taskName, private TaskInterface $task)
+    public function __construct(private readonly string $taskName, private readonly TaskInterface $task)
     {
     }
 
diff --git a/src/Messenger/TaskToYieldMessage.php b/src/Messenger/TaskToYieldMessage.php
index 92c8cbd6..05216d1e 100644
--- a/src/Messenger/TaskToYieldMessage.php
+++ b/src/Messenger/TaskToYieldMessage.php
@@ -9,7 +9,7 @@
  */
 final class TaskToYieldMessage
 {
-    public function __construct(private string $name)
+    public function __construct(private readonly string $name)
     {
     }
 
diff --git a/src/Middleware/AbstractMiddlewareStack.php b/src/Middleware/AbstractMiddlewareStack.php
index 16885eef..78dc641e 100644
--- a/src/Middleware/AbstractMiddlewareStack.php
+++ b/src/Middleware/AbstractMiddlewareStack.php
@@ -15,12 +15,12 @@
  */
 abstract class AbstractMiddlewareStack implements MiddlewareStackInterface
 {
-    private MiddlewareRegistryInterface $middlewareRegistry;
+    private readonly MiddlewareRegistryInterface $middlewareRegistry;
 
     /**
      * @var SplObjectStorage<PostExecutionMiddlewareInterface|PreExecutionMiddlewareInterface|PreSchedulingMiddlewareInterface|PostSchedulingMiddlewareInterface|RequiredMiddlewareInterface|OrderedMiddlewareInterface, null>
      */
-    private SplObjectStorage $executedMiddleware;
+    private readonly SplObjectStorage $executedMiddleware;
 
     /**
      * @param iterable|PreExecutionMiddlewareInterface[]|PostExecutionMiddlewareInterface[]|PreSchedulingMiddlewareInterface[]|PostSchedulingMiddlewareInterface[]|OrderedMiddlewareInterface[] $stack
diff --git a/src/Middleware/FiberAwareSchedulerMiddlewareStack.php b/src/Middleware/FiberAwareSchedulerMiddlewareStack.php
index 7f110e08..15fd0d90 100644
--- a/src/Middleware/FiberAwareSchedulerMiddlewareStack.php
+++ b/src/Middleware/FiberAwareSchedulerMiddlewareStack.php
@@ -16,7 +16,7 @@
 final class FiberAwareSchedulerMiddlewareStack extends AbstractFiberHandler implements SchedulerMiddlewareStackInterface
 {
     public function __construct(
-        private SchedulerMiddlewareStackInterface $middlewareStack,
+        private readonly SchedulerMiddlewareStackInterface $middlewareStack,
         ?LoggerInterface $logger = null
     ) {
         parent::__construct(logger: $logger);
diff --git a/src/Middleware/FiberAwareWorkerMiddlewareStack.php b/src/Middleware/FiberAwareWorkerMiddlewareStack.php
index 374e01f8..ae147412 100644
--- a/src/Middleware/FiberAwareWorkerMiddlewareStack.php
+++ b/src/Middleware/FiberAwareWorkerMiddlewareStack.php
@@ -16,7 +16,7 @@
 final class FiberAwareWorkerMiddlewareStack extends AbstractFiberHandler implements WorkerMiddlewareStackInterface
 {
     public function __construct(
-        private WorkerMiddlewareStackInterface $middlewareStack,
+        private readonly WorkerMiddlewareStackInterface $middlewareStack,
         ?LoggerInterface $logger = null
     ) {
         parent::__construct(logger: $logger);
diff --git a/src/Middleware/MaxExecutionMiddleware.php b/src/Middleware/MaxExecutionMiddleware.php
index 993b3073..90a33ec7 100644
--- a/src/Middleware/MaxExecutionMiddleware.php
+++ b/src/Middleware/MaxExecutionMiddleware.php
@@ -19,13 +19,8 @@
  */
 final class MaxExecutionMiddleware implements PreExecutionMiddlewareInterface, PostExecutionMiddlewareInterface
 {
-    private LoggerInterface $logger;
-
-    public function __construct(
-        private ?RateLimiterFactory $rateLimiter = null,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly ?RateLimiterFactory $rateLimiter = null, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     public function preExecute(TaskInterface $task): void
diff --git a/src/Middleware/NotifierMiddleware.php b/src/Middleware/NotifierMiddleware.php
index b0b355f5..f28b56d9 100644
--- a/src/Middleware/NotifierMiddleware.php
+++ b/src/Middleware/NotifierMiddleware.php
@@ -17,7 +17,7 @@
  */
 final class NotifierMiddleware implements PreSchedulingMiddlewareInterface, PostSchedulingMiddlewareInterface, PreExecutionMiddlewareInterface, PostExecutionMiddlewareInterface, OrderedMiddlewareInterface
 {
-    public function __construct(private ?NotifierInterface $notifier = null)
+    public function __construct(private readonly ?NotifierInterface $notifier = null)
     {
     }
 
diff --git a/src/Middleware/SingleRunTaskMiddleware.php b/src/Middleware/SingleRunTaskMiddleware.php
index a6270a17..7300cef9 100644
--- a/src/Middleware/SingleRunTaskMiddleware.php
+++ b/src/Middleware/SingleRunTaskMiddleware.php
@@ -17,13 +17,8 @@
  */
 final class SingleRunTaskMiddleware implements PostExecutionMiddlewareInterface, OrderedMiddlewareInterface, RequiredMiddlewareInterface
 {
-    private LoggerInterface $logger;
-
-    public function __construct(
-        private TransportInterface $transport,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly TransportInterface $transport, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     /**
diff --git a/src/Middleware/TaskLockBagMiddleware.php b/src/Middleware/TaskLockBagMiddleware.php
index 0cb85535..2e41645d 100644
--- a/src/Middleware/TaskLockBagMiddleware.php
+++ b/src/Middleware/TaskLockBagMiddleware.php
@@ -22,13 +22,8 @@ final class TaskLockBagMiddleware implements PostExecutionMiddlewareInterface, O
 {
     private const TASK_LOCK_MASK = '_symfony_scheduler_foo_';
 
-    private LoggerInterface $logger;
-
-    public function __construct(
-        private LockFactory $lockFactory,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly LockFactory $lockFactory, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     /**
diff --git a/src/Middleware/TaskUpdateMiddleware.php b/src/Middleware/TaskUpdateMiddleware.php
index 7232de63..b4ddcb7d 100644
--- a/src/Middleware/TaskUpdateMiddleware.php
+++ b/src/Middleware/TaskUpdateMiddleware.php
@@ -13,7 +13,7 @@
  */
 final class TaskUpdateMiddleware implements PostExecutionMiddlewareInterface, OrderedMiddlewareInterface, RequiredMiddlewareInterface
 {
-    public function __construct(private TransportInterface $transport)
+    public function __construct(private readonly TransportInterface $transport)
     {
     }
 
diff --git a/src/Pool/Configuration/SchedulerConfiguration.php b/src/Pool/Configuration/SchedulerConfiguration.php
index 4fc5b64a..55b6044e 100644
--- a/src/Pool/Configuration/SchedulerConfiguration.php
+++ b/src/Pool/Configuration/SchedulerConfiguration.php
@@ -15,11 +15,11 @@
  */
 final class SchedulerConfiguration
 {
-    private TaskListInterface $dueTasks;
+    private readonly TaskListInterface $dueTasks;
 
     public function __construct(
-        private DateTimeZone $timezone,
-        private DateTimeImmutable $synchronizedDate,
+        private readonly DateTimeZone $timezone,
+        private readonly DateTimeImmutable $synchronizedDate,
         TaskInterface ...$dueTasks
     ) {
         $this->dueTasks = new TaskList(tasks: $dueTasks);
diff --git a/src/Probe/Probe.php b/src/Probe/Probe.php
index d266074f..56842cb1 100644
--- a/src/Probe/Probe.php
+++ b/src/Probe/Probe.php
@@ -16,8 +16,8 @@
 final class Probe implements ProbeInterface
 {
     public function __construct(
-        private SchedulerInterface $scheduler,
-        private WorkerInterface $worker
+        private readonly SchedulerInterface $scheduler,
+        private readonly WorkerInterface $worker
     ) {
     }
 
diff --git a/src/Runner/CommandTaskRunner.php b/src/Runner/CommandTaskRunner.php
index 5f386ef4..4b268ac4 100644
--- a/src/Runner/CommandTaskRunner.php
+++ b/src/Runner/CommandTaskRunner.php
@@ -23,7 +23,7 @@
  */
 final class CommandTaskRunner implements RunnerInterface
 {
-    public function __construct(private Application $application)
+    public function __construct(private readonly Application $application)
     {
     }
 
@@ -80,7 +80,7 @@ private function buildOptions(CommandTask $commandTask): array
         $options = [];
         foreach ($commandTask->getOptions() as $key => $option) {
             if (is_int($key)) {
-                $options[] = str_starts_with($option, '--') ? $option : sprintf('--%s', $option);
+                $options[] = str_starts_with((string) $option, '--') ? $option : sprintf('--%s', $option);
 
                 continue;
             }
diff --git a/src/Runner/HttpTaskRunner.php b/src/Runner/HttpTaskRunner.php
index fed22881..baf3bb3e 100644
--- a/src/Runner/HttpTaskRunner.php
+++ b/src/Runner/HttpTaskRunner.php
@@ -17,7 +17,7 @@
  */
 final class HttpTaskRunner implements RunnerInterface
 {
-    private HttpClientInterface $httpClient;
+    private readonly HttpClientInterface $httpClient;
 
     public function __construct(HttpClientInterface $httpClient = null)
     {
diff --git a/src/Runner/MessengerTaskRunner.php b/src/Runner/MessengerTaskRunner.php
index f0d16d29..d78d9824 100644
--- a/src/Runner/MessengerTaskRunner.php
+++ b/src/Runner/MessengerTaskRunner.php
@@ -16,7 +16,7 @@
  */
 final class MessengerTaskRunner implements RunnerInterface
 {
-    public function __construct(private ?MessageBusInterface $bus = null)
+    public function __construct(private readonly ?MessageBusInterface $bus = null)
     {
     }
 
diff --git a/src/Runner/NotificationTaskRunner.php b/src/Runner/NotificationTaskRunner.php
index 14d5143e..393bdee1 100644
--- a/src/Runner/NotificationTaskRunner.php
+++ b/src/Runner/NotificationTaskRunner.php
@@ -16,7 +16,7 @@
  */
 final class NotificationTaskRunner implements RunnerInterface
 {
-    public function __construct(private ?NotifierInterface $notifier = null)
+    public function __construct(private readonly ?NotifierInterface $notifier = null)
     {
     }
 
diff --git a/src/Runner/ProbeTaskRunner.php b/src/Runner/ProbeTaskRunner.php
index 4401ce93..f97d0cea 100644
--- a/src/Runner/ProbeTaskRunner.php
+++ b/src/Runner/ProbeTaskRunner.php
@@ -19,7 +19,7 @@
  */
 final class ProbeTaskRunner implements RunnerInterface
 {
-    private HttpClientInterface $httpClient;
+    private readonly HttpClientInterface $httpClient;
 
     public function __construct(?HttpClientInterface $httpClient = null)
     {
diff --git a/src/Runner/RunnerRegistry.php b/src/Runner/RunnerRegistry.php
index 297ebd20..915cabd3 100644
--- a/src/Runner/RunnerRegistry.php
+++ b/src/Runner/RunnerRegistry.php
@@ -22,7 +22,7 @@ final class RunnerRegistry implements RunnerRegistryInterface
     /**
      * @var RunnerInterface[]
      */
-    private array $runners;
+    private readonly array $runners;
 
     /**
      * @param RunnerInterface[] $runners
diff --git a/src/SchedulePolicy/SchedulePolicyOrchestrator.php b/src/SchedulePolicy/SchedulePolicyOrchestrator.php
index bbc77f2d..da1f10d4 100644
--- a/src/SchedulePolicy/SchedulePolicyOrchestrator.php
+++ b/src/SchedulePolicy/SchedulePolicyOrchestrator.php
@@ -19,7 +19,7 @@ final class SchedulePolicyOrchestrator implements SchedulePolicyOrchestratorInte
     /**
      * @param PolicyInterface[] $policies
      */
-    public function __construct(private iterable $policies)
+    public function __construct(private readonly iterable $policies)
     {
     }
 
diff --git a/src/Serializer/AccessLockBagNormalizer.php b/src/Serializer/AccessLockBagNormalizer.php
index 0184369b..9f8c2ee0 100644
--- a/src/Serializer/AccessLockBagNormalizer.php
+++ b/src/Serializer/AccessLockBagNormalizer.php
@@ -21,13 +21,8 @@
  */
 final class AccessLockBagNormalizer implements NormalizerInterface, DenormalizerInterface
 {
-    private LoggerInterface $logger;
-
-    public function __construct(
-        private ObjectNormalizer|NormalizerInterface|DenormalizerInterface $objectNormalizer,
-        ?LoggerInterface $logger = null
-    ) {
-        $this->logger = $logger ?? new NullLogger();
+    public function __construct(private readonly ObjectNormalizer|NormalizerInterface|DenormalizerInterface $objectNormalizer, private readonly LoggerInterface $logger = new NullLogger())
+    {
     }
 
     /**
diff --git a/src/Serializer/NotificationTaskBagNormalizer.php b/src/Serializer/NotificationTaskBagNormalizer.php
index 188fb76f..2896c3cc 100644
--- a/src/Serializer/NotificationTaskBagNormalizer.php
+++ b/src/Serializer/NotificationTaskBagNormalizer.php
@@ -21,7 +21,7 @@
  */
 final class NotificationTaskBagNormalizer implements DenormalizerInterface, NormalizerInterface
 {
-    public function __construct(private DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer)
+    public function __construct(private readonly DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer)
     {
     }
 
diff --git a/src/Serializer/SchedulerConfigurationNormalizer.php b/src/Serializer/SchedulerConfigurationNormalizer.php
index 2658e165..35f3119a 100644
--- a/src/Serializer/SchedulerConfigurationNormalizer.php
+++ b/src/Serializer/SchedulerConfigurationNormalizer.php
@@ -23,10 +23,10 @@
 final class SchedulerConfigurationNormalizer implements NormalizerInterface, DenormalizerInterface
 {
     public function __construct(
-        private DenormalizerInterface|NormalizerInterface|TaskNormalizer $taskNormalizer,
-        private DenormalizerInterface|NormalizerInterface|DateTimeZoneNormalizer $dateTimeZoneNormalizer,
-        private DenormalizerInterface|NormalizerInterface|DateTimeNormalizer $dateTimeNormalizer,
-        private DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer
+        private readonly DenormalizerInterface|NormalizerInterface|TaskNormalizer $taskNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|DateTimeZoneNormalizer $dateTimeZoneNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|DateTimeNormalizer $dateTimeNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer
     ) {
     }
 
diff --git a/src/Serializer/TaskNormalizer.php b/src/Serializer/TaskNormalizer.php
index e3f8b9d2..b9ee3981 100644
--- a/src/Serializer/TaskNormalizer.php
+++ b/src/Serializer/TaskNormalizer.php
@@ -52,12 +52,12 @@ final class TaskNormalizer implements DenormalizerInterface, NormalizerInterface
     private const NORMALIZATION_DISCRIMINATOR = 'taskInternalType';
 
     public function __construct(
-        private DenormalizerInterface|NormalizerInterface|DateTimeNormalizer $dateTimeNormalizer,
-        private DenormalizerInterface|NormalizerInterface|DateTimeZoneNormalizer $dateTimeZoneNormalizer,
-        private DenormalizerInterface|NormalizerInterface|DateIntervalNormalizer $dateIntervalNormalizer,
-        private DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer,
-        private DenormalizerInterface|NormalizerInterface|NotificationTaskBagNormalizer $notificationTaskBagNormalizer,
-        private DenormalizerInterface|NormalizerInterface|AccessLockBagNormalizer $accessLockBagNormalizer
+        private readonly DenormalizerInterface|NormalizerInterface|DateTimeNormalizer $dateTimeNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|DateTimeZoneNormalizer $dateTimeZoneNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|DateIntervalNormalizer $dateIntervalNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|ObjectNormalizer $objectNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|NotificationTaskBagNormalizer $notificationTaskBagNormalizer,
+        private readonly DenormalizerInterface|NormalizerInterface|AccessLockBagNormalizer $accessLockBagNormalizer
     ) {
     }
 
diff --git a/src/Task/Builder/AbstractTaskBuilder.php b/src/Task/Builder/AbstractTaskBuilder.php
index 8c11b16c..6786f147 100644
--- a/src/Task/Builder/AbstractTaskBuilder.php
+++ b/src/Task/Builder/AbstractTaskBuilder.php
@@ -14,7 +14,7 @@
  */
 abstract class AbstractTaskBuilder
 {
-    public function __construct(private ExpressionBuilderInterface $expressionBuilder)
+    public function __construct(private readonly ExpressionBuilderInterface $expressionBuilder)
     {
     }
 
diff --git a/src/Task/FailedTask.php b/src/Task/FailedTask.php
index 3b547653..c63c192e 100644
--- a/src/Task/FailedTask.php
+++ b/src/Task/FailedTask.php
@@ -12,9 +12,9 @@
  */
 final class FailedTask extends AbstractTask
 {
-    private DateTimeImmutable $failedAt;
+    private readonly DateTimeImmutable $failedAt;
 
-    public function __construct(private TaskInterface $task, private string $reason)
+    public function __construct(private readonly TaskInterface $task, private readonly string $reason)
     {
         $this->failedAt = new DateTimeImmutable();
 
diff --git a/src/Task/LazyTask.php b/src/Task/LazyTask.php
index ea5d79d0..b4d4042e 100644
--- a/src/Task/LazyTask.php
+++ b/src/Task/LazyTask.php
@@ -14,7 +14,7 @@ final class LazyTask extends AbstractTask implements LazyInterface
 {
     private bool $initialized = false;
 
-    public function __construct(string $name, private Closure $sourceTaskClosure)
+    public function __construct(string $name, private readonly Closure $sourceTaskClosure)
     {
         parent::__construct(name: sprintf('%s.lazy', $name));
     }
diff --git a/src/Task/LazyTaskList.php b/src/Task/LazyTaskList.php
index 576d5551..ef99e679 100644
--- a/src/Task/LazyTaskList.php
+++ b/src/Task/LazyTaskList.php
@@ -17,7 +17,7 @@ final class LazyTaskList implements TaskListInterface, LazyInterface
     private TaskListInterface $list;
     private bool $initialized = false;
 
-    public function __construct(private TaskListInterface $sourceList)
+    public function __construct(private readonly TaskListInterface $sourceList)
     {
     }
 
diff --git a/src/Task/Output.php b/src/Task/Output.php
index c90d4e95..4b43a6e1 100644
--- a/src/Task/Output.php
+++ b/src/Task/Output.php
@@ -22,9 +22,9 @@ final class Output implements Stringable
     public const ERROR = 'error';
 
     public function __construct(
-        private TaskInterface $task,
-        private ?string $output = 'undefined',
-        private string $type = self::SUCCESS
+        private readonly TaskInterface $task,
+        private readonly ?string $output = 'undefined',
+        private readonly string $type = self::SUCCESS
     ) {
     }
 
diff --git a/src/Task/TaskBuilder.php b/src/Task/TaskBuilder.php
index 9fedf906..95aa2494 100644
--- a/src/Task/TaskBuilder.php
+++ b/src/Task/TaskBuilder.php
@@ -18,8 +18,8 @@ final class TaskBuilder implements TaskBuilderInterface
      * @param iterable|BuilderInterface[] $builders
      */
     public function __construct(
-        private iterable $builders,
-        private PropertyAccessorInterface $propertyAccessor
+        private readonly iterable $builders,
+        private readonly PropertyAccessorInterface $propertyAccessor
     ) {
     }
 
diff --git a/src/Task/TaskExecutionTracker.php b/src/Task/TaskExecutionTracker.php
index 858f1b33..83a6d667 100644
--- a/src/Task/TaskExecutionTracker.php
+++ b/src/Task/TaskExecutionTracker.php
@@ -13,7 +13,7 @@
  */
 final class TaskExecutionTracker implements TaskExecutionTrackerInterface
 {
-    public function __construct(private Stopwatch $watch)
+    public function __construct(private readonly Stopwatch $watch)
     {
     }
 
diff --git a/src/TaskBag/AccessLockBag.php b/src/TaskBag/AccessLockBag.php
index 0e7118e8..0affb8d2 100644
--- a/src/TaskBag/AccessLockBag.php
+++ b/src/TaskBag/AccessLockBag.php
@@ -11,7 +11,7 @@
  */
 final class AccessLockBag implements TaskBagInterface
 {
-    public function __construct(private ?Key $key = null)
+    public function __construct(private readonly ?Key $key = null)
     {
     }
 
diff --git a/src/TaskBag/NotificationTaskBag.php b/src/TaskBag/NotificationTaskBag.php
index 92056763..c848e81b 100644
--- a/src/TaskBag/NotificationTaskBag.php
+++ b/src/TaskBag/NotificationTaskBag.php
@@ -15,10 +15,10 @@ final class NotificationTaskBag implements TaskBagInterface
     /**
      * @var Recipient[]
      */
-    private array $recipients;
+    private readonly array $recipients;
 
     public function __construct(
-        private Notification $notification,
+        private readonly Notification $notification,
         Recipient ...$recipients
     ) {
         $this->recipients = $recipients;
diff --git a/src/Test/Constraint/Probe/ProbeEnabled.php b/src/Test/Constraint/Probe/ProbeEnabled.php
index 7316aca5..a9b6649e 100644
--- a/src/Test/Constraint/Probe/ProbeEnabled.php
+++ b/src/Test/Constraint/Probe/ProbeEnabled.php
@@ -12,7 +12,7 @@
  */
 final class ProbeEnabled extends Constraint
 {
-    public function __construct(private bool $expectedState)
+    public function __construct(private readonly bool $expectedState)
     {
     }
 
diff --git a/src/Test/Constraint/Probe/ProbeExecutedTask.php b/src/Test/Constraint/Probe/ProbeExecutedTask.php
index 78c85908..75eb0c13 100644
--- a/src/Test/Constraint/Probe/ProbeExecutedTask.php
+++ b/src/Test/Constraint/Probe/ProbeExecutedTask.php
@@ -13,7 +13,7 @@
  */
 final class ProbeExecutedTask extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/Probe/ProbeFailedTask.php b/src/Test/Constraint/Probe/ProbeFailedTask.php
index c428c4b8..f8bdea5f 100644
--- a/src/Test/Constraint/Probe/ProbeFailedTask.php
+++ b/src/Test/Constraint/Probe/ProbeFailedTask.php
@@ -13,7 +13,7 @@
  */
 final class ProbeFailedTask extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/Probe/ProbeScheduledTask.php b/src/Test/Constraint/Probe/ProbeScheduledTask.php
index dbd7fcb1..39b58d7d 100644
--- a/src/Test/Constraint/Probe/ProbeScheduledTask.php
+++ b/src/Test/Constraint/Probe/ProbeScheduledTask.php
@@ -13,7 +13,7 @@
  */
 final class ProbeScheduledTask extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/Probe/ProbeState.php b/src/Test/Constraint/Probe/ProbeState.php
index 358c245d..8ffa7173 100644
--- a/src/Test/Constraint/Probe/ProbeState.php
+++ b/src/Test/Constraint/Probe/ProbeState.php
@@ -17,7 +17,7 @@ final class ProbeState extends Constraint
     /**
      * @param array<string, int> $expectedState
      */
-    public function __construct(private array $expectedState)
+    public function __construct(private readonly array $expectedState)
     {
     }
 
diff --git a/src/Test/Constraint/Scheduler/SchedulerDueTask.php b/src/Test/Constraint/Scheduler/SchedulerDueTask.php
index 7143523f..921a3b20 100644
--- a/src/Test/Constraint/Scheduler/SchedulerDueTask.php
+++ b/src/Test/Constraint/Scheduler/SchedulerDueTask.php
@@ -13,7 +13,7 @@
  */
 final class SchedulerDueTask extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/TaskExecuted.php b/src/Test/Constraint/TaskExecuted.php
index 1ac87fe4..dc14e5ff 100644
--- a/src/Test/Constraint/TaskExecuted.php
+++ b/src/Test/Constraint/TaskExecuted.php
@@ -15,7 +15,7 @@
  */
 final class TaskExecuted extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/TaskFailed.php b/src/Test/Constraint/TaskFailed.php
index f8ac275e..c1752e2c 100644
--- a/src/Test/Constraint/TaskFailed.php
+++ b/src/Test/Constraint/TaskFailed.php
@@ -15,7 +15,7 @@
  */
 final class TaskFailed extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/TaskQueued.php b/src/Test/Constraint/TaskQueued.php
index be4b18ec..6eb2e68c 100644
--- a/src/Test/Constraint/TaskQueued.php
+++ b/src/Test/Constraint/TaskQueued.php
@@ -14,7 +14,7 @@
  */
 final class TaskQueued extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/TaskScheduled.php b/src/Test/Constraint/TaskScheduled.php
index 54f73f0a..af9b2248 100644
--- a/src/Test/Constraint/TaskScheduled.php
+++ b/src/Test/Constraint/TaskScheduled.php
@@ -14,7 +14,7 @@
  */
 final class TaskScheduled extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Test/Constraint/TaskUnscheduled.php b/src/Test/Constraint/TaskUnscheduled.php
index 3c31f56b..7e5ff8f5 100644
--- a/src/Test/Constraint/TaskUnscheduled.php
+++ b/src/Test/Constraint/TaskUnscheduled.php
@@ -14,7 +14,7 @@
  */
 final class TaskUnscheduled extends Constraint
 {
-    public function __construct(private int $expectedCount)
+    public function __construct(private readonly int $expectedCount)
     {
     }
 
diff --git a/src/Transport/AbstractCompoundTransportFactory.php b/src/Transport/AbstractCompoundTransportFactory.php
index cce907dd..ed99c66c 100644
--- a/src/Transport/AbstractCompoundTransportFactory.php
+++ b/src/Transport/AbstractCompoundTransportFactory.php
@@ -47,6 +47,6 @@ protected function handleTransportDsn(string $delimiter, Dsn $dsn, iterable $tra
             }
 
             throw new InvalidArgumentException('The given dsn cannot be used to create a transport');
-        }, explode($delimiter, $dsnList[0]));
+        }, explode($delimiter, (string) $dsnList[0]));
     }
 }
diff --git a/src/Transport/CacheTransportFactory.php b/src/Transport/CacheTransportFactory.php
index a34a1a6d..cb4aae4a 100644
--- a/src/Transport/CacheTransportFactory.php
+++ b/src/Transport/CacheTransportFactory.php
@@ -14,7 +14,7 @@
  */
 final class CacheTransportFactory implements TransportFactoryInterface
 {
-    public function __construct(private CacheItemPoolInterface $pool)
+    public function __construct(private readonly CacheItemPoolInterface $pool)
     {
     }
 
diff --git a/src/Transport/Configuration/AbstractCompoundConfigurationFactory.php b/src/Transport/Configuration/AbstractCompoundConfigurationFactory.php
index 64768049..60a0ce35 100644
--- a/src/Transport/Configuration/AbstractCompoundConfigurationFactory.php
+++ b/src/Transport/Configuration/AbstractCompoundConfigurationFactory.php
@@ -33,7 +33,7 @@ protected function handleCompoundConfiguration(string $delimiter, Dsn $dsn, iter
             throw new LogicException(sprintf('The %s configuration factory cannot create a configuration', static::class));
         }
 
-        $finalDsnList = explode($delimiter, $dsnList[0]);
+        $finalDsnList = explode($delimiter, (string) $dsnList[0]);
         if ($dsnList[0] === $finalDsnList[0]) {
             throw new InvalidArgumentException('The embedded dsn cannot be used to create a configuration');
         }
diff --git a/src/Transport/Configuration/CacheConfiguration.php b/src/Transport/Configuration/CacheConfiguration.php
index a13321b6..84bd769d 100644
--- a/src/Transport/Configuration/CacheConfiguration.php
+++ b/src/Transport/Configuration/CacheConfiguration.php
@@ -25,7 +25,7 @@ final class CacheConfiguration extends AbstractConfiguration
      * @param array<string, mixed> $options
      */
     public function __construct(
-        private CacheItemPoolInterface $pool,
+        private readonly CacheItemPoolInterface $pool,
         array $options = []
     ) {
         $this->boot();
diff --git a/src/Transport/Configuration/ConfigurationFactory.php b/src/Transport/Configuration/ConfigurationFactory.php
index 4819d761..5f3a86b6 100644
--- a/src/Transport/Configuration/ConfigurationFactory.php
+++ b/src/Transport/Configuration/ConfigurationFactory.php
@@ -18,7 +18,7 @@ final class ConfigurationFactory
     /**
      * @param ConfigurationFactoryInterface[] $factories
      */
-    public function __construct(private iterable $factories)
+    public function __construct(private readonly iterable $factories)
     {
     }
 
diff --git a/src/Transport/Configuration/FailOverConfiguration.php b/src/Transport/Configuration/FailOverConfiguration.php
index 9be9c1f3..d1814b8e 100644
--- a/src/Transport/Configuration/FailOverConfiguration.php
+++ b/src/Transport/Configuration/FailOverConfiguration.php
@@ -17,7 +17,7 @@ final class FailOverConfiguration extends AbstractCompoundConfiguration
     /**
      * @var SplObjectStorage<object, mixed>
      */
-    private SplObjectStorage $failedConfigurations;
+    private readonly SplObjectStorage $failedConfigurations;
 
     public function __construct(ConfigurationRegistryInterface $configurationRegistry)
     {
diff --git a/src/Transport/Configuration/FiberConfiguration.php b/src/Transport/Configuration/FiberConfiguration.php
index 77bba057..41c6a7e6 100644
--- a/src/Transport/Configuration/FiberConfiguration.php
+++ b/src/Transport/Configuration/FiberConfiguration.php
@@ -14,11 +14,8 @@
  */
 final class FiberConfiguration extends AbstractFiberHandler implements ConfigurationInterface
 {
-    public function __construct(
-        private ConfigurationInterface $configuration,
-        ?LoggerInterface $logger = null
-    ) {
-        parent::__construct($logger);
+    public function __construct(private readonly ConfigurationInterface $configuration, ?LoggerInterface $logger = null)
+    {
     }
 
     /**
diff --git a/src/Transport/Configuration/LazyConfiguration.php b/src/Transport/Configuration/LazyConfiguration.php
index e3d38743..71cbb1db 100644
--- a/src/Transport/Configuration/LazyConfiguration.php
+++ b/src/Transport/Configuration/LazyConfiguration.php
@@ -15,7 +15,7 @@ final class LazyConfiguration implements ConfigurationInterface, LazyInterface
     private ConfigurationInterface $configuration;
     private bool $initialized = false;
 
-    public function __construct(private ConfigurationInterface $sourceConfiguration)
+    public function __construct(private readonly ConfigurationInterface $sourceConfiguration)
     {
     }
 
diff --git a/src/Transport/Configuration/LongTailConfigurationFactory.php b/src/Transport/Configuration/LongTailConfigurationFactory.php
index ea261fd1..524abad6 100644
--- a/src/Transport/Configuration/LongTailConfigurationFactory.php
+++ b/src/Transport/Configuration/LongTailConfigurationFactory.php
@@ -15,7 +15,7 @@ final class LongTailConfigurationFactory extends AbstractCompoundConfigurationFa
     /**
      * @param ConfigurationFactoryInterface[] $factories
      */
-    public function __construct(private iterable $factories)
+    public function __construct(private readonly iterable $factories)
     {
     }
 
diff --git a/src/Transport/Dsn.php b/src/Transport/Dsn.php
index a7cd7fef..51c5012d 100644
--- a/src/Transport/Dsn.php
+++ b/src/Transport/Dsn.php
@@ -23,13 +23,13 @@ final class Dsn
      * @param array<string|int, mixed> $options
      */
     public function __construct(
-        private string $scheme,
-        private string $host,
-        private ?string $path = null,
-        private ?string $user = null,
-        private ?string $password = null,
-        private ?int $port = null,
-        private array $options = [],
+        private readonly string $scheme,
+        private readonly string $host,
+        private readonly ?string $path = null,
+        private readonly ?string $user = null,
+        private readonly ?string $password = null,
+        private readonly ?int $port = null,
+        private readonly array $options = [],
         private ?string $root = null
     ) {
     }
diff --git a/src/Transport/FailOverTransport.php b/src/Transport/FailOverTransport.php
index be7ee201..3db7e5a6 100644
--- a/src/Transport/FailOverTransport.php
+++ b/src/Transport/FailOverTransport.php
@@ -18,7 +18,7 @@ final class FailOverTransport extends AbstractCompoundTransport
     /**
      * @var SplObjectStorage<object, mixed>
      */
-    private SplObjectStorage $failedTransports;
+    private readonly SplObjectStorage $failedTransports;
 
     public function __construct(
         TransportRegistryInterface $registry,
diff --git a/src/Transport/LazyTransport.php b/src/Transport/LazyTransport.php
index 11031659..49e73396 100644
--- a/src/Transport/LazyTransport.php
+++ b/src/Transport/LazyTransport.php
@@ -19,7 +19,7 @@ final class LazyTransport implements TransportInterface, LazyInterface
     private TransportInterface $transport;
     private bool $initialized = false;
 
-    public function __construct(private TransportInterface $sourceTransport)
+    public function __construct(private readonly TransportInterface $sourceTransport)
     {
     }
 
diff --git a/src/Transport/LongTailTransportFactory.php b/src/Transport/LongTailTransportFactory.php
index 64cd683f..389c6320 100644
--- a/src/Transport/LongTailTransportFactory.php
+++ b/src/Transport/LongTailTransportFactory.php
@@ -17,7 +17,7 @@ final class LongTailTransportFactory extends AbstractCompoundTransportFactory
     /**
      * @param iterable|TransportFactoryInterface[] $transportFactories
      */
-    public function __construct(private iterable $transportFactories)
+    public function __construct(private readonly iterable $transportFactories)
     {
     }
 
diff --git a/src/Transport/RoundRobinTransport.php b/src/Transport/RoundRobinTransport.php
index 1fd935b2..1c8344c1 100644
--- a/src/Transport/RoundRobinTransport.php
+++ b/src/Transport/RoundRobinTransport.php
@@ -19,7 +19,7 @@ final class RoundRobinTransport extends AbstractCompoundTransport
     /**
      * @var SplObjectStorage<object, mixed>
      */
-    private SplObjectStorage $sleepingTransports;
+    private readonly SplObjectStorage $sleepingTransports;
 
     public function __construct(
         TransportRegistryInterface $registry,
diff --git a/src/Transport/TransportFactory.php b/src/Transport/TransportFactory.php
index dbd5fedd..14e38503 100644
--- a/src/Transport/TransportFactory.php
+++ b/src/Transport/TransportFactory.php
@@ -18,7 +18,7 @@ final class TransportFactory
     /**
      * @param TransportFactoryInterface[] $factories
      */
-    public function __construct(private iterable $factories)
+    public function __construct(private readonly iterable $factories)
     {
     }
 
diff --git a/src/Worker/ExecutionPolicy/ExecutionPolicyRegistry.php b/src/Worker/ExecutionPolicy/ExecutionPolicyRegistry.php
index 437f4857..69841791 100644
--- a/src/Worker/ExecutionPolicy/ExecutionPolicyRegistry.php
+++ b/src/Worker/ExecutionPolicy/ExecutionPolicyRegistry.php
@@ -20,7 +20,7 @@ final class ExecutionPolicyRegistry implements ExecutionPolicyRegistryInterface
     /**
      * @var ExecutionPolicyInterface[]
      */
-    private array $policies;
+    private readonly array $policies;
 
     /**
      * @param ExecutionPolicyInterface[] $policies
diff --git a/src/Worker/WorkerRegistry.php b/src/Worker/WorkerRegistry.php
index 4f1c3c17..0265fe39 100644
--- a/src/Worker/WorkerRegistry.php
+++ b/src/Worker/WorkerRegistry.php
@@ -16,7 +16,7 @@ final class WorkerRegistry implements WorkerRegistryInterface
     /**
      * @var WorkerInterface[]
      */
-    private array $workers;
+    private readonly array $workers;
 
     /**
      * @param WorkerInterface[] $workers