diff --git a/hwcompatible/client.py b/hwcompatible/client.py
index 221d3264c13ae9f1205bb9eaa414d8628bcae4be..d5b32a45b28d909640e71e646c8fc11542a89c43 100755
--- a/hwcompatible/client.py
+++ b/hwcompatible/client.py
@@ -23,7 +23,7 @@ except ImportError:
     from urllib2 import urlopen, Request, HTTPError
 
 
-class Client(object):
+class Client:
     """
     upload client
     """
diff --git a/hwcompatible/commandUI.py b/hwcompatible/commandUI.py
index 9fb055d4ab3c836c2fd47e64eeffc7af5bdea8ad..e9a119abdb49e2ba40038bd4e7733278a2a55ef9 100755
--- a/hwcompatible/commandUI.py
+++ b/hwcompatible/commandUI.py
@@ -16,7 +16,7 @@ import sys
 import readline
 
 
-class CommandUI(object):
+class CommandUI:
     """
     Command user interface selection
     """
diff --git a/hwcompatible/compatibility.py b/hwcompatible/compatibility.py
index 00cc9dd2c0ec191ef522d2639b5b6ccf3d74086e..c97dbf59bb052141137733ce4767b3a7dec7f665 100755
--- a/hwcompatible/compatibility.py
+++ b/hwcompatible/compatibility.py
@@ -29,7 +29,7 @@ from .reboot import Reboot
 from .client import Client
 
 
-class EulerCertification(object):
+class EulerCertification():
     """
     Main program of oec-hardware
     """
diff --git a/hwcompatible/device.py b/hwcompatible/device.py
index 1b1102698ad84240497b906d947fdf4ad2528c45..750ba3856ff95406ba645c967e6fa2174bad8e54 100755
--- a/hwcompatible/device.py
+++ b/hwcompatible/device.py
@@ -34,7 +34,7 @@ def filter_char(string):
     return filtered
 
 
-class CertDevice(object):
+class CertDevice:
     """
     Certified device
     """
@@ -80,7 +80,7 @@ class CertDevice(object):
         return self.devices
 
 
-class Device(object):
+class Device:
     """
     get device properties
     """
diff --git a/hwcompatible/document.py b/hwcompatible/document.py
index 9c0eba8711fdf41b5d09eab66db00065dc3dbce9..9f89ef77a11120dbbded9a8d0b0e7bc24e89fda8 100755
--- a/hwcompatible/document.py
+++ b/hwcompatible/document.py
@@ -21,7 +21,7 @@ from .sysinfo import SysInfo
 from .env import CertEnv
 
 
-class Document(object):
+class Document():
     """
     Read and write documents
     """
@@ -168,7 +168,7 @@ class FactoryDocument(Document):
         return factory
 
 
-class ConfigFile(object):
+class ConfigFile:
     """
     Get parameters from configuration file
     """
diff --git a/hwcompatible/env.py b/hwcompatible/env.py
index 9551f50348be2df58cd3a055b061378c326829fb..f8eea607b3578c981ac8782d81199d4cf822fd5a 100755
--- a/hwcompatible/env.py
+++ b/hwcompatible/env.py
@@ -13,7 +13,7 @@
 # Create: 2020-04-01
 
 
-class CertEnv(object):
+class CertEnv:
     """
     Certification file path
     """
diff --git a/hwcompatible/log.py b/hwcompatible/log.py
index 656bd9ce8aa5650358dd27a50fefb92255cf5620..90d5906030d7e7f8587e05899d6b85a2a1584dc8 100755
--- a/hwcompatible/log.py
+++ b/hwcompatible/log.py
@@ -66,7 +66,7 @@ class Log(object):
         self.log = None
 
 
-class Logger(object):
+class Logger():
     """
      Output results to file
     """
diff --git a/hwcompatible/reboot.py b/hwcompatible/reboot.py
index 5532d8b90c0ef9417c15dfc5da9d515ea8e3c035..e2a08515f39079f61e249fdc12da3358e6b8522b 100755
--- a/hwcompatible/reboot.py
+++ b/hwcompatible/reboot.py
@@ -19,7 +19,7 @@ from .env import CertEnv
 from .command import Command, CertCommandError
 
 
-class Reboot(object):
+class Reboot:
     """
     Special for restart tasks, so that the test can be continued after the machine is restarted
     """
diff --git a/hwcompatible/sysinfo.py b/hwcompatible/sysinfo.py
index 051147a017fda93647390f3560a33ce8f1fe5df0..b8d038d8bbc5ea2d5ef8e1cf812e0e91c2bac2d3 100755
--- a/hwcompatible/sysinfo.py
+++ b/hwcompatible/sysinfo.py
@@ -16,7 +16,7 @@ import os
 import re
 
 
-class SysInfo(object):
+class SysInfo:
     """
     Get system information
     """
diff --git a/hwcompatible/test.py b/hwcompatible/test.py
index 4af1a1b6cae2b8d78fa8915bca37c6e11c71300a..789351d50b2ea611c21352ba114415f25ae6746e 100755
--- a/hwcompatible/test.py
+++ b/hwcompatible/test.py
@@ -13,7 +13,7 @@
 # Create: 2020-04-01
 
 
-class Test(object):
+class Test:
     """
     Test set template
     """
diff --git a/tests/cpufreq/cpufreq.py b/tests/cpufreq/cpufreq.py
index 66bc8da7db846b3029ec430ee5f7122b20d9e1d7..3ad6dd24f23ba8fef01bc0a82c8222785e56de9d 100644
--- a/tests/cpufreq/cpufreq.py
+++ b/tests/cpufreq/cpufreq.py
@@ -20,7 +20,7 @@ from hwcompatible.test import Test
 from hwcompatible.command import Command
 
 
-class CPU(object):
+class CPU:
     def __init__(self):
         self.cpu = None
         self.nums = None