diff --git a/attic/cache.py b/attic/cache.py
index acbc76653..e9f0a81dd 100644
--- a/attic/cache.py
+++ b/attic/cache.py
@@ -10,7 +10,7 @@
 from .hashindex import ChunkIndex
 
 
-class Cache(object):
+class Cache:
     """Client Side cache
     """
     class RepositoryReplay(Error):
diff --git a/attic/key.py b/attic/key.py
index ef623f36c..e32c0bf71 100644
--- a/attic/key.py
+++ b/attic/key.py
@@ -44,7 +44,7 @@ def key_factory(repository, manifest_data):
         raise UnsupportedPayloadError(manifest_data[0])
 
 
-class KeyBase(object):
+class KeyBase:
 
     def __init__(self):
         self.TYPE_STR = bytes([self.TYPE])
diff --git a/attic/remote.py b/attic/remote.py
index f2a0aed06..27305a619 100644
--- a/attic/remote.py
+++ b/attic/remote.py
@@ -23,7 +23,7 @@ class PathNotAllowed(Error):
     """Repository path not allowed"""
 
 
-class RepositoryServer(object):
+class RepositoryServer:
 
     def __init__(self, restrict_to_paths):
         self.repository = None
@@ -78,7 +78,7 @@ def open(self, path, create=False):
         return self.repository.id
 
 
-class RemoteRepository(object):
+class RemoteRepository:
     extra_test_args = []
 
     class RPCError(Exception):
@@ -312,4 +312,4 @@ def get_many(self, keys):
 def cache_if_remote(repository):
     if isinstance(repository, RemoteRepository):
         return RepositoryCache(repository)
-    return repository
\ No newline at end of file
+    return repository
diff --git a/attic/repository.py b/attic/repository.py
index eed85dc43..f87e2731e 100644
--- a/attic/repository.py
+++ b/attic/repository.py
@@ -19,7 +19,7 @@
 TAG_COMMIT = 2
 
 
-class Repository(object):
+class Repository:
     """Filesystem based transactional key value store
 
     On disk layout:
@@ -378,7 +378,7 @@ def preload(self, ids):
         """
 
 
-class LoggedIO(object):
+class LoggedIO:
 
     header_fmt = struct.Struct('<IIB')
     assert header_fmt.size == 9
diff --git a/attic/testsuite/helpers.py b/attic/testsuite/helpers.py
index e01b652c0..74f6fae80 100644
--- a/attic/testsuite/helpers.py
+++ b/attic/testsuite/helpers.py
@@ -125,7 +125,7 @@ def test_read_only_lock_file(self):
         lock.release()
 
 
-class MockArchive(object):
+class MockArchive:
 
     def __init__(self, ts):
         self.ts = ts
diff --git a/attic/testsuite/key.py b/attic/testsuite/key.py
index 543d1be36..7e0d235bd 100644
--- a/attic/testsuite/key.py
+++ b/attic/testsuite/key.py
@@ -11,7 +11,7 @@
 
 class KeyTestCase(AtticTestCase):
 
-    class MockArgs(object):
+    class MockArgs:
         repository = Location(tempfile.mkstemp()[1])
 
     keyfile2_key_file = """
@@ -37,8 +37,8 @@ def setUp(self):
     def tearDown(self):
         shutil.rmtree(self.tmppath)
 
-    class MockRepository(object):
-        class _Location(object):
+    class MockRepository:
+        class _Location:
             orig = '/some/place'
 
         _location = _Location()