diff --git a/apps/backoffice/backend/src/BackofficeBackendKernel.php b/apps/backoffice/backend/src/BackofficeBackendKernel.php
index f3765c268..6ed60b1be 100644
--- a/apps/backoffice/backend/src/BackofficeBackendKernel.php
+++ b/apps/backoffice/backend/src/BackofficeBackendKernel.php
@@ -12,7 +12,7 @@
 
 use function dirname;
 
-final class BackofficeBackendKernel extends Kernel
+class BackofficeBackendKernel extends Kernel
 {
 	use MicroKernelTrait;
 
diff --git a/apps/backoffice/frontend/src/BackofficeFrontendKernel.php b/apps/backoffice/frontend/src/BackofficeFrontendKernel.php
index 9411cb2bc..dd793f7ab 100644
--- a/apps/backoffice/frontend/src/BackofficeFrontendKernel.php
+++ b/apps/backoffice/frontend/src/BackofficeFrontendKernel.php
@@ -12,7 +12,7 @@
 
 use function dirname;
 
-final class BackofficeFrontendKernel extends Kernel
+class BackofficeFrontendKernel extends Kernel
 {
 	use MicroKernelTrait;
 
diff --git a/apps/mooc/backend/src/Command/DomainEvents/PublishDomainEventsFromMutationsCommand.php b/apps/mooc/backend/src/Command/DomainEvents/PublishDomainEventsFromMutationsCommand.php
index 91dc36da2..945784311 100644
--- a/apps/mooc/backend/src/Command/DomainEvents/PublishDomainEventsFromMutationsCommand.php
+++ b/apps/mooc/backend/src/Command/DomainEvents/PublishDomainEventsFromMutationsCommand.php
@@ -83,6 +83,7 @@ private function findTransformer(string $tableName, string $operation): ?Databas
 			throw new RuntimeException("Transformer not found for table $tableName and operation $operation");
 		}
 
+		/** @var class-string<DatabaseMutationToDomainEvent>|null $class */
 		$class = $this->transformers[$tableName][$operation];
 
 		return $class ? new $class() : null;
diff --git a/apps/mooc/backend/src/MoocBackendKernel.php b/apps/mooc/backend/src/MoocBackendKernel.php
index 36c5be57e..cc8f8ed58 100644
--- a/apps/mooc/backend/src/MoocBackendKernel.php
+++ b/apps/mooc/backend/src/MoocBackendKernel.php
@@ -12,7 +12,7 @@
 
 use function dirname;
 
-final class MoocBackendKernel extends Kernel
+class MoocBackendKernel extends Kernel
 {
 	use MicroKernelTrait;