diff --git a/lib/tfw/networking/event_handler_connector.py b/lib/tfw/networking/event_handler_connector.py
index 60cbb94..74b6270 100644
--- a/lib/tfw/networking/event_handler_connector.py
+++ b/lib/tfw/networking/event_handler_connector.py
@@ -8,7 +8,7 @@ from .serialization import serialize_tfw_msg, with_deserialize_tfw_msg
 LOG = logging.getLogger(__name__)
 
 
-class EventHandlerDownlinkConnector():
+class EventHandlerDownlinkConnector:
     def __init__(self, bind_addr):
         self._zmq_pull_socket = zmq.Context.instance().socket(zmq.PULL)
         self._zmq_pull_socket.setsockopt(zmq.RCVHWM, 0)
@@ -24,7 +24,7 @@ class EventHandlerDownlinkConnector():
         self._zmq_pull_stream.close()
 
 
-class EventHandlerUplinkConnector():
+class EventHandlerUplinkConnector:
     def __init__(self, bind_addr):
         self._zmq_pub_socket = zmq.Context.instance().socket(zmq.PUB)
         self._zmq_pub_socket.setsockopt(zmq.SNDHWM, 0)
diff --git a/lib/tfw/networking/server_connector.py b/lib/tfw/networking/server_connector.py
index 88e9450..da407ac 100644
--- a/lib/tfw/networking/server_connector.py
+++ b/lib/tfw/networking/server_connector.py
@@ -10,7 +10,7 @@ from .serialization import serialize_tfw_msg, with_deserialize_tfw_msg
 LOG = logging.getLogger(__name__)
 
 
-class ServerDownlinkConnector():
+class ServerDownlinkConnector:
     def __init__(self, connect_addr):
         self._zmq_sub_socket = zmq.Context.instance().socket(zmq.SUB)
         self._zmq_sub_socket.setsockopt(zmq.RCVHWM, 0)
@@ -28,7 +28,7 @@ class ServerDownlinkConnector():
         self._zmq_sub_stream.close()
 
 
-class ServerUplinkConnector():
+class ServerUplinkConnector:
     def __init__(self, connect_addr):
         self._zmq_push_socket = zmq.Context.instance().socket(zmq.PUSH)
         self._zmq_push_socket.setsockopt(zmq.SNDHWM, 0)