diff --git a/ESSArch_Core/WorkflowEngine/models.py b/ESSArch_Core/WorkflowEngine/models.py
index 0af90768a..6e4f32551 100644
--- a/ESSArch_Core/WorkflowEngine/models.py
+++ b/ESSArch_Core/WorkflowEngine/models.py
@@ -787,10 +787,11 @@ def revoke(self):
         current_app.control.revoke(str(self.celery_id), terminate=True)
         self.status = celery_states.REVOKED
         self.save()
-        time.sleep(5)
         if self.information_package and self.information_package.is_locked():
-            self.information_package.clear_lock()
-            logger.info('When task ({}) revoked, unlocked ip {}'.format(self.pk, self.information_package))
+            time.sleep(5)
+            if self.information_package.is_locked():
+                self.information_package.clear_lock()
+                logger.info('When task ({}) revoked, unlocked ip {}'.format(self.pk, self.information_package))
 
     def retry(self):
         """
diff --git a/ESSArch_Core/config/settings.py b/ESSArch_Core/config/settings.py
index 855b57452..da5663593 100644
--- a/ESSArch_Core/config/settings.py
+++ b/ESSArch_Core/config/settings.py
@@ -522,7 +522,7 @@
 DOCS_ROOT = os.path.join(BASE_DIR, 'docs/_build/{lang}/html')
 
 # Celery settings
-CELERY_IMPORTS = (
+CELERY_IMPORTS = [
     "ESSArch_Core.fixity.action.tasks",
     "ESSArch_Core.ip.tasks",
     "ESSArch_Core.maintenance.tasks",
@@ -532,7 +532,7 @@
     "ESSArch_Core.tasks",
     "ESSArch_Core.workflow.tasks",
     "ESSArch_Core.WorkflowEngine.tests.tasks",
-)
+]
 try:
     from local_essarch_settings import RABBITMQ_URL
 except ImportError:
diff --git a/requirements/base.txt b/requirements/base.txt
index 51e807c9d..8c2fc211e 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,6 +1,6 @@
 asgiref==3.9.1
 boto3==1.42.18
-celery[tblib]==5.6.1
+celery[tblib]==5.6.0
 cffi==2.0.0
 channels==4.3.2
 channels-redis==4.3.0