diff --git a/notebook/base/zmqhandlers.py b/notebook/base/zmqhandlers.py
index d092151f9f..f2a53ace7c 100644
--- a/notebook/base/zmqhandlers.py
+++ b/notebook/base/zmqhandlers.py
@@ -4,10 +4,8 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-import os
 import json
 import struct
-import warnings
 import sys
 
 try:
diff --git a/notebook/services/kernels/handlers.py b/notebook/services/kernels/handlers.py
index 303507b7d7..01aa3a8940 100644
--- a/notebook/services/kernels/handlers.py
+++ b/notebook/services/kernels/handlers.py
@@ -6,7 +6,6 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-from functools import partial
 import json
 import logging
 from textwrap import dedent
@@ -23,7 +22,6 @@
 from ...base.handlers import APIHandler
 from ...base.zmqhandlers import AuthenticatedZMQStreamHandler, deserialize_binary_message
 
-from jupyter_client import protocol_version as client_protocol_version
 
 class MainKernelHandler(APIHandler):
 
diff --git a/notebook/services/kernels/kernelmanager.py b/notebook/services/kernels/kernelmanager.py
index 1c63a81089..c32a6e5307 100644
--- a/notebook/services/kernels/kernelmanager.py
+++ b/notebook/services/kernels/kernelmanager.py
@@ -9,17 +9,15 @@
 
 from collections import defaultdict
 from datetime import datetime, timedelta
-from functools import partial
 import os
 import uuid
 
 from tornado import gen, web
-from tornado.concurrent import Future
 from tornado.ioloop import IOLoop, PeriodicCallback
 
 from jupyter_kernel_mgmt.client import IOLoopKernelClient
 from jupyter_kernel_mgmt.restarter import TornadoKernelRestarter
-from traitlets import (Any, Bool, Dict, List, Unicode, TraitError, Integer,
+from traitlets import (Any, Bool, Dict, Unicode, TraitError, Integer,
        Float, Instance, default, validate
 )
 from traitlets.config.configurable import LoggingConfigurable