diff --git a/doc/requirements.txt b/doc/requirements.txt
index d3c22481..4a140912 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,8 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 openstackdocstheme>=1.18.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
diff --git a/lower-constraints.txt b/lower-constraints.txt
index db9787cd..374c1ec1 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -20,7 +20,6 @@ python-subunit==1.0.0
 pylint==1.7.1
 reno==2.5.0
 requests-mock==1.2.0
-six==1.10.0
 sphinx==1.6.5
 stestr==1.0.0
 tempest==17.1.0
diff --git a/requirements.txt b/requirements.txt
index 175d63a7..d934ad61 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,6 @@ decorator>=4.3.0 # BSD
 eventlet>=0.24.1 # MIT
 netaddr>=0.7.18 # BSD
 tenacity>=5.0.1 # Apache-2.0
-six>=1.10.0 # MIT
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
 oslo.serialization>=2.28.1 # Apache-2.0
diff --git a/vmware_nsxlib/tests/unit/v3/mocks.py b/vmware_nsxlib/tests/unit/v3/mocks.py
index 09a7519b..d39f325d 100644
--- a/vmware_nsxlib/tests/unit/v3/mocks.py
+++ b/vmware_nsxlib/tests/unit/v3/mocks.py
@@ -12,11 +12,11 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import requests
-import six.moves.urllib.parse as urlparse
+from urllib import parse as urlparse
 
 from oslo_serialization import jsonutils
 from oslo_utils import uuidutils
+import requests
 
 from vmware_nsxlib.v3 import nsx_constants
 
diff --git a/vmware_nsxlib/tests/unit/v3/test_cluster.py b/vmware_nsxlib/tests/unit/v3/test_cluster.py
index 3950e4ee..b3ab25be 100644
--- a/vmware_nsxlib/tests/unit/v3/test_cluster.py
+++ b/vmware_nsxlib/tests/unit/v3/test_cluster.py
@@ -15,11 +15,11 @@
 #
 import unittest
 from unittest import mock
+from urllib import parse as urlparse
 
 from requests import codes
 from requests import exceptions as requests_exceptions
 from requests import models
-import six.moves.urllib.parse as urlparse
 
 from oslo_serialization import jsonutils
 
diff --git a/vmware_nsxlib/tests/unit/v3/test_security.py b/vmware_nsxlib/tests/unit/v3/test_security.py
index 485c343f..4c927992 100644
--- a/vmware_nsxlib/tests/unit/v3/test_security.py
+++ b/vmware_nsxlib/tests/unit/v3/test_security.py
@@ -16,7 +16,6 @@
 from unittest import mock
 
 from oslo_utils import uuidutils
-import six
 
 from vmware_nsxlib.tests.unit.v3 import nsxlib_testcase
 from vmware_nsxlib.tests.unit.v3 import test_constants
@@ -482,7 +481,7 @@ class TestNsxLibNSGroup(nsxlib_testcase.NsxClientTestCase):
     def test_get_nsgroup_lp_complex_expression(self):
         port_tags = {'app': 'foo', 'project': 'myproject'}
         port_exp = [self.nsxlib.ns_group.get_port_tag_expression(k, v)
-                    for k, v in six.iteritems(port_tags)]
+                    for k, v in port_tags.items()]
         complex_exp = self.nsxlib.ns_group.get_nsgroup_complex_expression(
             expressions=port_exp)
         expected_exp = {'resource_type': const.NSGROUP_COMPLEX_EXP,
@@ -492,7 +491,7 @@ class TestNsxLibNSGroup(nsxlib_testcase.NsxClientTestCase):
     def test_get_nsgroup_ls_complex_expression(self):
         switch_tags = {'app': 'foo', 'project': 'myproject'}
         switch_exp = [self.nsxlib.ns_group.get_switch_tag_expression(k, v)
-                      for k, v in six.iteritems(switch_tags)]
+                      for k, v in switch_tags.items()]
         complex_exp = self.nsxlib.ns_group.get_nsgroup_complex_expression(
             expressions=switch_exp)
         expected_exp = {'resource_type': const.NSGROUP_COMPLEX_EXP,
diff --git a/vmware_nsxlib/v3/client.py b/vmware_nsxlib/v3/client.py
index 227c49e8..96031aab 100644
--- a/vmware_nsxlib/v3/client.py
+++ b/vmware_nsxlib/v3/client.py
@@ -15,11 +15,12 @@
 #
 import re
 import time
+from urllib import parse as urlparse
 
 from oslo_log import log
 from oslo_serialization import jsonutils
 import requests
-import six.moves.urllib.parse as urlparse
+
 from vmware_nsxlib._i18n import _
 from vmware_nsxlib.v3 import exceptions
 from vmware_nsxlib.v3 import utils
diff --git a/vmware_nsxlib/v3/cluster.py b/vmware_nsxlib/v3/cluster.py
index 2f969e14..37f15f70 100644
--- a/vmware_nsxlib/v3/cluster.py
+++ b/vmware_nsxlib/v3/cluster.py
@@ -23,6 +23,8 @@ import itertools
 import logging
 import re
 import time
+from urllib import parse as urlparse
+import urllib3
 
 import eventlet
 from eventlet import greenpool
@@ -32,9 +34,6 @@ from oslo_log import log
 from oslo_service import loopingcall
 import requests
 from requests import adapters
-import six
-import six.moves.urllib.parse as urlparse
-import urllib3
 
 from vmware_nsxlib._i18n import _
 from vmware_nsxlib.v3 import client as nsx_client
@@ -53,8 +52,7 @@ logging.getLogger(
 urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AbstractHTTPProvider(object):
+class AbstractHTTPProvider(object, metaclass=abc.ABCMeta):
     """Interface for providers of HTTP connections.
 
     which are responsible for creating and validating connections
diff --git a/vmware_nsxlib/v3/exceptions.py b/vmware_nsxlib/v3/exceptions.py
index 70aab1ca..8b66751e 100644
--- a/vmware_nsxlib/v3/exceptions.py
+++ b/vmware_nsxlib/v3/exceptions.py
@@ -15,7 +15,6 @@
 #
 
 from oslo_utils import excutils
-import six
 
 from vmware_nsxlib._i18n import _
 
@@ -40,10 +39,6 @@ class NsxLibException(Exception):
                     # at least get the core message out if something happened
                     super(NsxLibException, self).__init__(self.message)
 
-    if six.PY2:
-        def __unicode__(self):
-            return unicode(self.msg) if six.PY2 else self.msg  # noqa
-
     def __str__(self):
         return self.msg
 
diff --git a/vmware_nsxlib/v3/lib.py b/vmware_nsxlib/v3/lib.py
index 33877ced..d4a6cb97 100644
--- a/vmware_nsxlib/v3/lib.py
+++ b/vmware_nsxlib/v3/lib.py
@@ -17,7 +17,6 @@ import abc
 from distutils import version
 
 from oslo_log import log
-import six
 
 from vmware_nsxlib._i18n import _
 from vmware_nsxlib.v3 import client
@@ -29,8 +28,7 @@ from vmware_nsxlib.v3 import utils
 LOG = log.getLogger(__name__)
 
 
-@six.add_metaclass(abc.ABCMeta)
-class NsxLibBase(object):
+class NsxLibBase(object, metaclass=abc.ABCMeta):
     def __init__(self, nsxlib_config):
 
         self.nsx_version = None
diff --git a/vmware_nsxlib/v3/policy/core_defs.py b/vmware_nsxlib/v3/policy/core_defs.py
index 783ce9b5..b8f17328 100644
--- a/vmware_nsxlib/v3/policy/core_defs.py
+++ b/vmware_nsxlib/v3/policy/core_defs.py
@@ -18,7 +18,6 @@ import abc
 from distutils import version
 
 from oslo_log import log as logging
-import six
 
 from vmware_nsxlib.v3 import exceptions
 from vmware_nsxlib.v3 import nsx_constants
@@ -70,8 +69,7 @@ TIER1_LOCALE_SERVICES_PATH_PATTERN = (TIER1S_PATH_PATTERN +
                                       "%s/locale-services/")
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ResourceDef(object):
+class ResourceDef(object, metaclass=abc.ABCMeta):
     def __init__(self, nsx_version=None, **kwargs):
         self.attrs = kwargs
 
diff --git a/vmware_nsxlib/v3/policy/core_resources.py b/vmware_nsxlib/v3/policy/core_resources.py
index 8c7c36d9..0084aaa7 100644
--- a/vmware_nsxlib/v3/policy/core_resources.py
+++ b/vmware_nsxlib/v3/policy/core_resources.py
@@ -22,7 +22,6 @@ import decorator
 import eventlet
 from oslo_log import log as logging
 from oslo_utils import uuidutils
-import six
 
 from vmware_nsxlib._i18n import _
 from vmware_nsxlib.v3 import exceptions
@@ -56,8 +55,7 @@ def check_allowed_passthrough(f, *args, **kwargs):
     return f(*args, **kwargs)
 
 
-@six.add_metaclass(abc.ABCMeta)
-class NsxPolicyResourceBase(object):
+class NsxPolicyResourceBase(object, metaclass=abc.ABCMeta):
     """Abstract class for NSX policy resources
 
     declaring the basic apis each policy resource should support,
diff --git a/vmware_nsxlib/v3/policy/lb_resources.py b/vmware_nsxlib/v3/policy/lb_resources.py
index 6b44f9f4..5b99a2f3 100644
--- a/vmware_nsxlib/v3/policy/lb_resources.py
+++ b/vmware_nsxlib/v3/policy/lb_resources.py
@@ -14,11 +14,9 @@
 #    under the License.
 #
 
-import abc
 import copy
 
 from oslo_log import log as logging
-import six
 
 from vmware_nsxlib._i18n import _
 from vmware_nsxlib.v3 import exceptions as nsxlib_exc
@@ -1080,7 +1078,6 @@ class NsxPolicyLoadBalancerVirtualServerAPI(NsxPolicyResourceBase):
             sleep=sleep, max_attempts=max_attempts)
 
 
-@six.add_metaclass(abc.ABCMeta)
 class NsxPolicyLBMonitorProfileBase(NsxPolicyResourceBase):
     """NSX Policy LB monitor profile"""
 
diff --git a/vmware_nsxlib/v3/token_provider.py b/vmware_nsxlib/v3/token_provider.py
index cfe9e918..e4ba4fea 100644
--- a/vmware_nsxlib/v3/token_provider.py
+++ b/vmware_nsxlib/v3/token_provider.py
@@ -15,13 +15,10 @@
 
 import abc
 
-import six
-
 
 # NOTE: Consider inheriting from an abstract TokenProvider class to share
 #       interface with XSRF token
-@six.add_metaclass(abc.ABCMeta)
-class AbstractJWTProvider(object):
+class AbstractJWTProvider(object, metaclass=abc.ABCMeta):
     """Interface for providers of JSON Web Tokens(JWT)
 
     Responsible to provide the token value and refresh it once expired,
diff --git a/vmware_nsxlib/v3/trust_management.py b/vmware_nsxlib/v3/trust_management.py
index c7495cb8..2f1a5a7e 100644
--- a/vmware_nsxlib/v3/trust_management.py
+++ b/vmware_nsxlib/v3/trust_management.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import six
-
 from vmware_nsxlib.v3 import exceptions as nsxlib_exc
 from vmware_nsxlib.v3 import utils
 
@@ -98,7 +96,7 @@ class NsxLibTrustManagement(utils.NsxLibApiBase):
     def find_cert_and_identity(self, name, cert_pem):
         certs = self.get_certs()
 
-        if not isinstance(cert_pem, six.text_type):
+        if not isinstance(cert_pem, str):
             cert_pem = cert_pem.decode('ascii')
 
         cert_ids = [cert['id'] for cert in certs