diff --git a/arrowhead_client/client/client_sync.py b/arrowhead_client/client/client_sync.py
index ac45390..12864f3 100644
--- a/arrowhead_client/client/client_sync.py
+++ b/arrowhead_client/client/client_sync.py
@@ -9,6 +9,7 @@
 from arrowhead_client.client.core_services import CoreServices
 from arrowhead_client.service import Service, ServiceInterface
 
+
 class ArrowheadClientSync(ArrowheadClient):
     """
     Base class for asynchronous Arrowhead Clients.
diff --git a/arrowhead_client/constants.py b/arrowhead_client/constants.py
index 30d0663..8fb7545 100644
--- a/arrowhead_client/constants.py
+++ b/arrowhead_client/constants.py
@@ -49,6 +49,7 @@ class CoreSystem(str, Enum):
     AUTHORIZATION = 'authorization'
     EVENT_HANDLER = 'event_handler'
 
+
 class OrchestrationFlags(Flag):
     MATCHMAKING = auto()
     METADATA_SEARCH = auto()