diff --git a/tests/scripts/check-files.py b/tests/scripts/check-files.py
index 2515ec9..f8d9261 100755
--- a/tests/scripts/check-files.py
+++ b/tests/scripts/check-files.py
@@ -17,7 +17,7 @@
 import sys
 
 
-class FileIssueTracker(object):
+class FileIssueTracker:
     """Base class for file-wide issue tracking.
 
     To implement a checker that processes a file as a whole, inherit from
@@ -188,7 +188,7 @@
         return False
 
 
-class IntegrityChecker(object):
+class IntegrityChecker:
     """Sanity-check files under the current directory."""
 
     def __init__(self, log_file):
diff --git a/tests/scripts/generate_test_code.py b/tests/scripts/generate_test_code.py
index 1fff099..c0f99f7 100755
--- a/tests/scripts/generate_test_code.py
+++ b/tests/scripts/generate_test_code.py
@@ -208,7 +208,7 @@
     pass
 
 
-class FileWrapper(io.FileIO, object):
+class FileWrapper(io.FileIO):
     """
     This class extends built-in io.FileIO class with attribute line_no,
     that indicates line number for the line that is read.
diff --git a/tests/scripts/test_generate_test_code.py b/tests/scripts/test_generate_test_code.py
index 6d7113e..e39b29b 100755
--- a/tests/scripts/test_generate_test_code.py
+++ b/tests/scripts/test_generate_test_code.py
@@ -294,7 +294,7 @@
         self.assertEqual(code, expected)
 
 
-class StringIOWrapper(StringIO, object):
+class StringIOWrapper(StringIO):
     """
     file like class to mock file object in tests.
     """