diff --git a/requirements.txt b/requirements.txt
index db20359..5393a95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,3 @@
-# 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.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 pyghmi>=1.0.24 # Apache-2.0
@@ -9,6 +6,5 @@ pyasn1>=0.5.1 # BSD
 pyasn1-modules>=0.3.0 # BSD
 requests>=2.14.2 # Apache-2.0
 defusedxml>=0.7.0 # PSF
-six>=1.10.0 # MIT
 oslo.utils>=3.33.0 # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
diff --git a/scciclient/irmc/elcm.py b/scciclient/irmc/elcm.py
index 4bdff31..212ff7e 100644
--- a/scciclient/irmc/elcm.py
+++ b/scciclient/irmc/elcm.py
@@ -21,7 +21,6 @@ import time
 
 from oslo_serialization import jsonutils
 import requests
-import six
 
 from scciclient.irmc import scci
 
@@ -1118,7 +1117,7 @@ def set_bios_configuration(irmc_info, settings):
         setting_value = setting_param.get("value")
         # Revert-conversion from a string of True/False to boolean.
         # It will be raise failed if put "True" or "False" string value.
-        if isinstance(setting_value, six.string_types):
+        if isinstance(setting_value, str):
             if setting_value.lower() == "true":
                 setting_value = True
             elif setting_value.lower() == "false":
@@ -1153,6 +1152,6 @@ def get_bios_settings(irmc_info):
         type_config, config = BIOS_CONFIGURATION_DICTIONARY[
             setting_param].split("_")
         if config in bios_config_data.get(type_config, {}):
-            value = six.text_type(bios_config_data[type_config][config])
+            value = str(bios_config_data[type_config][config])
             settings.append({'name': setting_param, 'value': value})
     return settings
diff --git a/scciclient/irmc/scci.py b/scciclient/irmc/scci.py
index 350cec7..fca0905 100755
--- a/scciclient/irmc/scci.py
+++ b/scciclient/irmc/scci.py
@@ -22,7 +22,6 @@ import time
 
 import defusedxml.ElementTree as ET
 import requests
-import six
 
 from scciclient.irmc import ipmi
 from scciclient.irmc import snmp
@@ -250,8 +249,7 @@ class MetaShareType(type):
         return cls.CIFS
 
 
-@six.add_metaclass(MetaShareType)
-class ShareType(object):
+class ShareType(object, metaclass=MetaShareType):
     """"Virtual Media Share Type."""
     NFS = 0
     CIFS = 1
diff --git a/scciclient/irmc/snmp.py b/scciclient/irmc/snmp.py
index 00b9fb4..e7b6b2d 100644
--- a/scciclient/irmc/snmp.py
+++ b/scciclient/irmc/snmp.py
@@ -14,7 +14,6 @@
 
 from pysnmp import error as snmp_error
 from pysnmp import hlapi as snmp
-import six
 
 
 BMC_NAME_OID = '1.3.6.1.4.1.231.2.10.2.2.10.3.4.1.3.1.1'
@@ -96,7 +95,7 @@ def get_bios_firmware_version(snmp_client):
 
     try:
         bios_firmware_version = snmp_client.get(BIOS_FW_VERSION_OID)
-        return six.text_type(bios_firmware_version)
+        return str(bios_firmware_version)
     except SNMPFailure as e:
         raise SNMPBIOSFirmwareFailure(
             SNMP_FAILURE_MSG % ("GET BIOS FIRMWARE VERSION", e))
@@ -112,7 +111,7 @@ def get_server_model(snmp_client):
 
     try:
         server_model = snmp_client.get(SERVER_MODEL_OID)
-        return six.text_type(server_model)
+        return str(server_model)
     except SNMPFailure as e:
         raise SNMPServerModelFailure(
             SNMP_FAILURE_MSG % ("GET SERVER MODEL", e))
diff --git a/scciclient/irmc/viom/client.py b/scciclient/irmc/viom/client.py
index a495cb9..17dfdc1 100644
--- a/scciclient/irmc/viom/client.py
+++ b/scciclient/irmc/viom/client.py
@@ -17,8 +17,6 @@ import re
 import socket
 import struct
 
-import six
-
 from scciclient.irmc import scci
 from scciclient.irmc.viom import elcm
 
@@ -44,8 +42,7 @@ _CNA_FCOE_FUNC_IDX = 2
 _CNA_ISCSI_FUNC_IDX = 3
 
 
-@six.add_metaclass(abc.ABCMeta)
-class _PortHandler(object):
+class _PortHandler(object, metaclass=abc.ABCMeta):
     """VIOM Configurator with physical port information"""
 
     def __init__(self, slot_type, card_type, slot_idx, card_idx, port_idx):
diff --git a/scciclient/irmc/viom/elcm.py b/scciclient/irmc/viom/elcm.py
index be79574..399c9c6 100644
--- a/scciclient/irmc/viom/elcm.py
+++ b/scciclient/irmc/viom/elcm.py
@@ -16,8 +16,6 @@ import abc
 import json
 import time
 
-import six
-
 from scciclient.irmc import elcm
 from scciclient.irmc import scci
 
@@ -121,8 +119,7 @@ class VIOMAttribute(object):
         self.init = init
 
 
-@six.add_metaclass(abc.ABCMeta)
-class VIOMElement(object):
+class VIOMElement(object, metaclass=abc.ABCMeta):
     """Element in VIOM table."""
     def __init__(self, **kwargs):
         for attr in self.__class__._BASIC_ATTRIBUTES:
@@ -287,8 +284,7 @@ class Slot(VIOMElement):
         return json
 
 
-@six.add_metaclass(abc.ABCMeta)
-class PCICard(object):
+class PCICard(object, metaclass=abc.ABCMeta):
     "Abstract class for PCI cards."
     def __init__(self, card_idx, adapter):
         self.card_idx = card_idx
@@ -341,8 +337,7 @@ class AddOnCard(PCICard):
     INDEX_KEY = '@AddOnCardIdx'
 
 
-@six.add_metaclass(abc.ABCMeta)
-class Adapter(object):
+class Adapter(object, metaclass=abc.ABCMeta):
     """Abstract class for adapters.
 
     Adapter represents type of PCI card.
@@ -395,8 +390,7 @@ class CNAAdapter(Adapter):
     ADAPTER_NAME = 'CNAAdapter'
 
 
-@six.add_metaclass(abc.ABCMeta)
-class AdapterPort(VIOMElement):
+class AdapterPort(VIOMElement, metaclass=abc.ABCMeta):
     """Port in adapters."""
 
     def __init__(self, port_idx, **kwargs):
@@ -555,8 +549,7 @@ class CNAPort(AdapterPort):
         return port
 
 
-@six.add_metaclass(abc.ABCMeta)
-class CNAFunction(VIOMElement):
+class CNAFunction(VIOMElement, metaclass=abc.ABCMeta):
     """Abstract class for Functions for CNA card"""
     _BASIC_ATTRIBUTES = [
         VIOMAttribute('function_enable', 'FunctionEnable'),
@@ -729,8 +722,7 @@ class ISCSIFunction(CNAFunction):
         return {'MAC': self.mac} if self.mac else None
 
 
-@six.add_metaclass(abc.ABCMeta)
-class Boot(VIOMElement):
+class Boot(VIOMElement, metaclass=abc.ABCMeta):
     """Abstract class for BootProtocol"""
     _BASIC_ATTRIBUTES = []
 
diff --git a/scciclient/tests/irmc/test_scci.py b/scciclient/tests/irmc/test_scci.py
index d0013db..22e7c7d 100644
--- a/scciclient/tests/irmc/test_scci.py
+++ b/scciclient/tests/irmc/test_scci.py
@@ -15,6 +15,8 @@
 Test class for iRMC Power Driver
 """
 
+import builtins
+import io
 import os
 import time
 from unittest import mock
@@ -22,18 +24,12 @@ import xml.etree.ElementTree as ET
 
 import defusedxml.ElementTree as dET
 from requests_mock.contrib import fixture as rm_fixture
-import six
-import six.moves.builtins as __builtin__
 import testtools
 
 from scciclient.irmc import ipmi
 from scciclient.irmc import scci
 from scciclient.irmc import snmp
 
-if six.PY3:
-    import io
-    file = io.BytesIO
-
 
 IRMC_CONFIG_PARTIAL = """<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
 <CMDSEQ>
@@ -1188,7 +1184,7 @@ class SCCITestCase(testtools.TestCase):
                                              upgrade_type)
         self.assertEqual(expected_status, result['upgrade_status'])
 
-    @mock.patch.object(__builtin__, 'open', autospec=True)
+    @mock.patch.object(builtins, 'open', autospec=True)
     def test_create_bios_firmware_upgrade(self, open_mock):
         upgrade_type = 'bios'
         self.requests_mock.post("http://" + self.irmc_address + "/biosupdate",
@@ -1210,7 +1206,7 @@ class SCCITestCase(testtools.TestCase):
         r = client(bios_input)
         self.assertEqual(r.status_code, 200)
 
-    @mock.patch.object(__builtin__, 'open', side_effect=IOError, autospec=True)
+    @mock.patch.object(builtins, 'open', side_effect=IOError, autospec=True)
     def test_create_fail_bios_firmware_upgrade(self, open_mock):
         upgrade_type = 'bios'
         self.requests_mock.post("http://" + self.irmc_address + "/biosupdate",
@@ -1234,7 +1230,7 @@ class SCCITestCase(testtools.TestCase):
 
         self.assertRaises(scci.SCCIClientError, client, bios_input)
 
-    @mock.patch.object(__builtin__, 'open', autospec=True)
+    @mock.patch.object(builtins, 'open', autospec=True)
     def test_create_irmc_firmware_upgrade(self, open_mock):
         upgrade_type = 'irmc'
         self.requests_mock.post("http://" + self.irmc_address +
@@ -1257,7 +1253,7 @@ class SCCITestCase(testtools.TestCase):
         r = client(irmc_input)
         self.assertEqual(r.status_code, 200)
 
-    @mock.patch.object(__builtin__, 'open', side_effect=IOError, autospec=True)
+    @mock.patch.object(builtins, 'open', side_effect=IOError, autospec=True)
     def test_create_fail_irmc_firmware_upgrade(self, open_mock):
         upgrade_type = 'irmc'
         self.requests_mock.post("http://" + self.irmc_address +
@@ -1271,7 +1267,7 @@ class SCCITestCase(testtools.TestCase):
                                 """)
         # Fake wrong file directory
         irmc_input = '/media/DATA/TX2540M1111.bin'
-        mock_file_handle = mock.MagicMock(spec=file)
+        mock_file_handle = mock.MagicMock(spec=io.BytesIO)
         open_mock.return_value = mock_file_handle
         client = scci.get_client(self.irmc_address,
                                  self.irmc_username,
diff --git a/setup.cfg b/setup.cfg
index 1ae0e31..0f46cfa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -6,6 +6,7 @@ description_file =
 author = FUJITSU LIMITED
 author_email = fj-lsoft-scciclient@dl.jp.fujitsu.com
 home_page = https://opendev.org/x/python-scciclient
+python_requires = >=3.8
 classifier =
     Development Status :: 4 - Beta
     Environment :: Console
diff --git a/test-requirements.txt b/test-requirements.txt
index 9bb6199..96cf5c6 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,7 +1,3 @@
-# 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.
-
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD