diff --git a/jupyter_scheduler/scheduler.py b/jupyter_scheduler/scheduler.py
index a1b24b1a..7a66b951 100644
--- a/jupyter_scheduler/scheduler.py
+++ b/jupyter_scheduler/scheduler.py
@@ -39,7 +39,11 @@
     UpdateJobDefinition,
 )
 from jupyter_scheduler.orm import Job, JobDefinition, create_session
-from jupyter_scheduler.utils import copy_directory, create_output_directory, create_output_filename
+from jupyter_scheduler.utils import (
+    copy_directory,
+    create_output_directory,
+    create_output_filename,
+)
 
 
 class BaseScheduler(LoggingConfigurable):
diff --git a/jupyter_scheduler/utils.py b/jupyter_scheduler/utils.py
index 2aeac792..b60cb436 100644
--- a/jupyter_scheduler/utils.py
+++ b/jupyter_scheduler/utils.py
@@ -1,7 +1,7 @@
 import json
 import os
-from datetime import datetime, timezone
 import shutil
+from datetime import datetime, timezone
 from typing import List, Optional
 from uuid import UUID