diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8bd5f12f..94fe8770 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@ Latest
 
 ## Changes
 * [#339](https://github.com/cleverage/process-bundle/issues/339) A shared service referenced by several tasks of the same process is rejected when the container is compiled (`InvalidArgumentException` naming the service, the tasks and the process): all these tasks ran with the same instance, initialized with the options of each task in turn, without error. Declare the task services with `shared: false` (applied by the autoconfiguration of `TaskInterface` since 5.4). Update documentation, add tests.
+* [#351](https://github.com/cleverage/process-bundle/issues/351) `ProcessManager` and `ProcessHelpCommand` are typed on `TaskRegistryInterface` instead of the final `TaskRegistry` class: the task registry can be decorated or replaced. Add tests.
 
 ## Fixes
 * [#343](https://github.com/cleverage/process-bundle/issues/343) The temporary files of `FileSplitterTask` (`file_splitter`), `CsvSplitterTask` (`csv_splitter`) and of the JSON buffer of `ProcessLauncherTask` (`json_buffering`) are created with a random name, exclusively (an existing path, symbolic links included, is never reused) and readable by their owner only, instead of a name derived from the time (`uniqid()`), opened in `w` mode with the permissions of the umask. Update documentation, add tests.
diff --git a/src/Command/ProcessHelpCommand.php b/src/Command/ProcessHelpCommand.php
index af865943..038f330a 100644
--- a/src/Command/ProcessHelpCommand.php
+++ b/src/Command/ProcessHelpCommand.php
@@ -23,6 +23,7 @@
 use CleverAge\ProcessBundle\Model\TaskInterface;
 use CleverAge\ProcessBundle\Registry\ProcessConfigurationRegistry;
 use CleverAge\ProcessBundle\Registry\TaskRegistry;
+use CleverAge\ProcessBundle\Registry\TaskRegistryInterface;
 use CleverAge\ProcessBundle\Task\Process\ProcessExecutorTask;
 use CleverAge\ProcessBundle\Task\Process\ProcessLauncherTask;
 use Psr\Container\ContainerInterface;
@@ -64,7 +65,7 @@ class ProcessHelpCommand extends Command
 
     protected const INDENT_SIZE = 4;
 
-    protected TaskRegistry $taskRegistry;
+    protected TaskRegistryInterface $taskRegistry;
 
     /**
      * @deprecated since 5.4, only set when a container is passed to the constructor, will be removed in v6.0
@@ -73,7 +74,7 @@ class ProcessHelpCommand extends Command
 
     public function __construct(
         protected ProcessConfigurationRegistry $processConfigRegistry,
-        TaskRegistry|ContainerInterface $taskRegistry,
+        TaskRegistryInterface|ContainerInterface $taskRegistry,
     ) {
         parent::__construct();
         if ($taskRegistry instanceof ContainerInterface) {
diff --git a/src/Manager/ProcessManager.php b/src/Manager/ProcessManager.php
index dc195f4e..b601b3b1 100644
--- a/src/Manager/ProcessManager.php
+++ b/src/Manager/ProcessManager.php
@@ -35,6 +35,7 @@
 use CleverAge\ProcessBundle\Model\TaskInterface;
 use CleverAge\ProcessBundle\Registry\ProcessConfigurationRegistry;
 use CleverAge\ProcessBundle\Registry\TaskRegistry;
+use CleverAge\ProcessBundle\Registry\TaskRegistryInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Contracts\Service\ResetInterface;
@@ -70,7 +71,7 @@ class ProcessManager implements ProcessManagerInterface, ResetInterface
 
     protected ?TaskConfiguration $taskConfiguration = null;
 
-    protected TaskRegistry $taskRegistry;
+    protected TaskRegistryInterface $taskRegistry;
 
     /**
      * @param iterable<ProcessStopCheckerInterface> $stopCheckers
@@ -83,9 +84,9 @@ public function __construct(
         protected ContextualOptionResolver $contextualOptionResolver,
         protected EventDispatcherInterface $eventDispatcher,
         protected iterable $stopCheckers = [],
-        ?TaskRegistry $taskRegistry = null,
+        ?TaskRegistryInterface $taskRegistry = null,
     ) {
-        if (!$taskRegistry instanceof TaskRegistry) {
+        if (!$taskRegistry instanceof TaskRegistryInterface) {
             trigger_deprecation(
                 'cleverage/process-bundle',
                 '5.4',
diff --git a/tests/Manager/ProcessManagerTaskRegistryTest.php b/tests/Manager/ProcessManagerTaskRegistryTest.php
index fedaddc6..517aa618 100644
--- a/tests/Manager/ProcessManagerTaskRegistryTest.php
+++ b/tests/Manager/ProcessManagerTaskRegistryTest.php
@@ -24,8 +24,10 @@
 use CleverAge\ProcessBundle\Model\AbstractConfigurableTask;
 use CleverAge\ProcessBundle\Model\ProcessHistory;
 use CleverAge\ProcessBundle\Model\ProcessState;
+use CleverAge\ProcessBundle\Model\TaskInterface;
 use CleverAge\ProcessBundle\Registry\ProcessConfigurationRegistry;
 use CleverAge\ProcessBundle\Registry\TaskRegistry;
+use CleverAge\ProcessBundle\Registry\TaskRegistryInterface;
 use CleverAge\ProcessBundle\Task\ConstantOutputTask;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\UsesClass;
@@ -65,6 +67,21 @@ public function testTasksAreFetchedWithTheTaskRegistry(): void
         self::assertSame([], $this->deprecations);
     }
 
+    public function testAnyTaskRegistryCanBeUsed(): void
+    {
+        // E.g. a decorator of the task registry of the bundle
+        $taskRegistry = new class implements TaskRegistryInterface {
+            public function getTask(TaskConfiguration $taskConfiguration): TaskInterface
+            {
+                return new ConstantOutputTask();
+            }
+        };
+        $processManager = $this->collectDeprecations(fn (): ProcessManager => $this->createProcessManager($taskRegistry));
+
+        self::assertSame('ok', $this->collectDeprecations(static fn (): mixed => $processManager->execute('test.process')));
+        self::assertSame([], $this->deprecations);
+    }
+
     public function testWithoutTaskRegistryTheTasksAreFetchedFromTheContainerWithADeprecation(): void
     {
         $processManager = $this->collectDeprecations(fn (): ProcessManager => $this->createProcessManager(null));
@@ -76,7 +93,7 @@ public function testWithoutTaskRegistryTheTasksAreFetchedFromTheContainerWithADe
         );
     }
 
-    private function createProcessManager(?TaskRegistry $taskRegistry): ProcessManager
+    private function createProcessManager(?TaskRegistryInterface $taskRegistry): ProcessManager
     {
         $container = new Container();
         $container->set('app.constant', new ConstantOutputTask());