diff --git a/fbchat/_attachment.py b/fbchat/_attachment.py
index 24dc17b..ec48721 100644
--- a/fbchat/_attachment.py
+++ b/fbchat/_attachment.py
@@ -3,7 +3,7 @@ from . import _util
 
 
 @attr.s(cmp=False)
-class Attachment(object):
+class Attachment:
     """Represents a Facebook attachment."""
 
     #: The attachment ID
diff --git a/fbchat/_client.py b/fbchat/_client.py
index 3d009e0..ec7efee 100644
--- a/fbchat/_client.py
+++ b/fbchat/_client.py
@@ -20,7 +20,7 @@ ACONTEXT = {
 }
 
 
-class Client(object):
+class Client:
     """A client for the Facebook Chat (Messenger).
 
     This is the main class of ``fbchat``, which contains all the methods you use to
diff --git a/fbchat/_message.py b/fbchat/_message.py
index 60a52c5..9f6afa6 100644
--- a/fbchat/_message.py
+++ b/fbchat/_message.py
@@ -43,7 +43,7 @@ class MessageReaction(Enum):
 
 
 @attr.s(cmp=False)
-class Mention(object):
+class Mention:
     """Represents a ``@mention``."""
 
     #: The thread ID the mention is pointing at
@@ -55,7 +55,7 @@ class Mention(object):
 
 
 @attr.s(cmp=False)
-class Message(object):
+class Message:
     """Represents a Facebook message."""
 
     #: The actual message
diff --git a/fbchat/_plan.py b/fbchat/_plan.py
index d0dc576..1a3c5bd 100644
--- a/fbchat/_plan.py
+++ b/fbchat/_plan.py
@@ -10,7 +10,7 @@ class GuestStatus(Enum):
 
 
 @attr.s(cmp=False)
-class Plan(object):
+class Plan:
     """Represents a plan."""
 
     #: ID of the plan
diff --git a/fbchat/_poll.py b/fbchat/_poll.py
index 554d91e..08c6de6 100644
--- a/fbchat/_poll.py
+++ b/fbchat/_poll.py
@@ -2,7 +2,7 @@ import attr
 
 
 @attr.s(cmp=False)
-class Poll(object):
+class Poll:
     """Represents a poll."""
 
     #: Title of the poll
@@ -25,7 +25,7 @@ class Poll(object):
 
 
 @attr.s(cmp=False)
-class PollOption(object):
+class PollOption:
     """Represents a poll option."""
 
     #: Text of the poll option
diff --git a/fbchat/_quick_reply.py b/fbchat/_quick_reply.py
index 147632d..5a9a262 100644
--- a/fbchat/_quick_reply.py
+++ b/fbchat/_quick_reply.py
@@ -3,7 +3,7 @@ from ._attachment import Attachment
 
 
 @attr.s(cmp=False)
-class QuickReply(object):
+class QuickReply:
     """Represents a quick reply."""
 
     #: Payload of the quick reply
diff --git a/fbchat/_state.py b/fbchat/_state.py
index ed7b3f2..8062b16 100644
--- a/fbchat/_state.py
+++ b/fbchat/_state.py
@@ -97,7 +97,7 @@ def _2fa_helper(session, code, r):
 
 
 @attr.s(slots=True)  # TODO i Python 3: Add kw_only=True
-class State(object):
+class State:
     """Stores and manages state required for most Facebook requests."""
 
     user_id = attr.ib()
diff --git a/fbchat/_thread.py b/fbchat/_thread.py
index c3f4ab6..e39b4b4 100644
--- a/fbchat/_thread.py
+++ b/fbchat/_thread.py
@@ -70,7 +70,7 @@ class ThreadColor(Enum):
 
 
 @attr.s(cmp=False, init=False)
-class Thread(object):
+class Thread:
     """Represents a Facebook thread."""
 
     #: The unique identifier of the thread. Can be used a ``thread_id``. See :ref:`intro_threads` for more info
diff --git a/fbchat/_user.py b/fbchat/_user.py
index af70dbb..b864b13 100644
--- a/fbchat/_user.py
+++ b/fbchat/_user.py
@@ -180,7 +180,7 @@ class User(Thread):
 
 
 @attr.s(cmp=False)
-class ActiveStatus(object):
+class ActiveStatus:
     #: Whether the user is active now
     active = attr.ib(None)
     #: Timestamp when the user was last active