diff --git a/Makefile b/Makefile
index 1c479aaec..b871c1d2c 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ format:
 	black dask_kubernetes setup.py
 
 lint:
-	flake8 dask-kubernetes
+	flake8 dask_kubernetes
 	black --check dask_kubernetes setup.py
 
 test:
@@ -87,7 +87,7 @@ kind-bootstrap:  # https://github.com/kubernetes-sigs/kind
 	curl -Lo ./kind https://github.com/kubernetes-sigs/kind/releases/download/${KIND_VERSION}/kind-${OS}-${ARCHITECTURE} && \
 	chmod +x ./kind && \
 	mv kind ${BIN_PATH}
-	
+
 kind-start:
 	kind create cluster && \
 	kind export kubeconfig
diff --git a/dask_kubernetes/core.py b/dask_kubernetes/core.py
index 37b5f1259..80c045258 100644
--- a/dask_kubernetes/core.py
+++ b/dask_kubernetes/core.py
@@ -3,12 +3,9 @@
 import getpass
 import logging
 import os
-import socket
 import string
 import time
-from urllib.parse import urlparse
 import uuid
-import weakref
 from weakref import finalize
 
 try:
@@ -20,7 +17,6 @@
 import dask.distributed
 import distributed.security
 from distributed.deploy import SpecCluster, ProcessInterface
-from distributed.comm.utils import offload
 from distributed.utils import Log, Logs
 import kubernetes_asyncio as kubernetes
 from kubernetes_asyncio.client.rest import ApiException
diff --git a/dask_kubernetes/objects.py b/dask_kubernetes/objects.py
index aaef1b309..7762868cd 100644
--- a/dask_kubernetes/objects.py
+++ b/dask_kubernetes/objects.py
@@ -236,7 +236,7 @@ def clean_pod_template(pod_template, match_node_purpose="prefer", pod_type="work
         pod_template.spec.tolerations.extend(tolerations)
 
     # add default node affinity to k8s.dask.org/node-purpose=worker
-    if match_node_purpose is not "ignore":
+    if match_node_purpose != "ignore":
         # for readability
         affinity = pod_template.spec.affinity
 
diff --git a/dask_kubernetes/tests/conftest.py b/dask_kubernetes/tests/conftest.py
index 184b48c4b..886873f7b 100644
--- a/dask_kubernetes/tests/conftest.py
+++ b/dask_kubernetes/tests/conftest.py
@@ -1,10 +1,6 @@
-import asyncio
-
 import pytest
 
-import kubernetes
-
-from dask_kubernetes.auth import ClusterAuth, KubeConfig, InCluster
+from dask_kubernetes.auth import KubeConfig, InCluster
 
 
 def pytest_addoption(parser):
diff --git a/dask_kubernetes/tests/test_async.py b/dask_kubernetes/tests/test_async.py
index 47f2e5af1..42e11a9f8 100644
--- a/dask_kubernetes/tests/test_async.py
+++ b/dask_kubernetes/tests/test_async.py
@@ -5,7 +5,6 @@
 import os
 import random
 from time import time
-import uuid
 import yaml
 
 import kubernetes_asyncio as kubernetes
@@ -736,6 +735,9 @@ def load(self):
     assert fails["count"] == 3
 
 
+@pytest.mark.xfail(
+    reason="Updating the default client configuration is broken in kubernetes"
+)
 @pytest.mark.asyncio
 async def test_auth_kubeconfig_with_filename():
     await KubeConfig(config_file=CONFIG_DEMO).load()
@@ -748,6 +750,9 @@ async def test_auth_kubeconfig_with_filename():
     assert config.ssl_ca_cert == FAKE_CA
 
 
+@pytest.mark.xfail(
+    reason="Updating the default client configuration is broken in kubernetes"
+)
 @pytest.mark.asyncio
 async def test_auth_kubeconfig_with_context():
     await KubeConfig(config_file=CONFIG_DEMO, context="exp-scratch").load()
diff --git a/dask_kubernetes/tests/test_sync.py b/dask_kubernetes/tests/test_sync.py
index cec47c326..2ccd6ee08 100644
--- a/dask_kubernetes/tests/test_sync.py
+++ b/dask_kubernetes/tests/test_sync.py
@@ -1,9 +1,5 @@
-import asyncio
-import base64
-import getpass
 import os
 from time import sleep, time
-import uuid
 import yaml
 
 import dask
@@ -11,15 +7,10 @@
 from dask_kubernetes import (
     KubeCluster,
     make_pod_spec,
-    ClusterAuth,
-    KubeConfig,
-    KubeAuth,
 )
 from dask.distributed import Client, wait
 from distributed.utils_test import loop, captured_logger  # noqa: F401
 from distributed.utils import tmpfile
-import kubernetes
-from random import random
 
 TEST_DIR = os.path.abspath(os.path.join(__file__, ".."))
 CONFIG_DEMO = os.path.join(TEST_DIR, "config-demo.yaml")