diff --git a/cssselect2/__init__.py b/cssselect2/__init__.py
index f1b11be..2257a8c 100644
--- a/cssselect2/__init__.py
+++ b/cssselect2/__init__.py
@@ -20,7 +20,7 @@
 VERSION = __version__ = '0.6.0'
 
 
-class Matcher(object):
+class Matcher:
     """A CSS selectors storage that can match against HTML elements."""
     def __init__(self):
         self.id_selectors = {}
diff --git a/cssselect2/compiler.py b/cssselect2/compiler.py
index b5564bb..9e8a159 100644
--- a/cssselect2/compiler.py
+++ b/cssselect2/compiler.py
@@ -34,7 +34,7 @@ def compile_selector_list(input, namespaces=None):
     ]
 
 
-class CompiledSelector(object):
+class CompiledSelector:
     """Abstract representation of a selector."""
     def __init__(self, parsed_selector):
         source = _compile_node(parsed_selector.parsed_tree)
diff --git a/cssselect2/parser.py b/cssselect2/parser.py
index 9723821..323ff75 100644
--- a/cssselect2/parser.py
+++ b/cssselect2/parser.py
@@ -263,7 +263,7 @@ class SelectorError(ValueError):
     """A specialized ``ValueError`` for invalid selectors."""
 
 
-class TokenStream(object):
+class TokenStream:
     def __init__(self, tokens):
         self.tokens = iter(tokens)
         self.peeked = []  # In reversed order
@@ -299,7 +299,7 @@ def skip_whitespace_and_comment(self):
         return self.skip(['comment', 'whitespace'])
 
 
-class Selector(object):
+class Selector:
     def __init__(self, tree, pseudo_element=None):
         self.parsed_tree = tree
         if pseudo_element is None:
@@ -318,7 +318,7 @@ def __repr__(self):
             return '%r::%s' % (self.parsed_tree, self.pseudo_element)
 
 
-class CombinedSelector(object):
+class CombinedSelector:
     def __init__(self, left, combinator, right):
         #: Combined or compound selector
         self.left = left
@@ -337,7 +337,7 @@ def __repr__(self):
         return '%r%s%r' % (self.left, self.combinator, self.right)
 
 
-class CompoundSelector(object):
+class CompoundSelector:
     """Aka. sequence of simple selectors, in Level 3."""
     def __init__(self, simple_selectors):
         self.simple_selectors = simple_selectors
@@ -356,7 +356,7 @@ def __repr__(self):
         return ''.join(map(repr, self.simple_selectors))
 
 
-class LocalNameSelector(object):
+class LocalNameSelector:
     specificity = 0, 0, 1
 
     def __init__(self, local_name):
@@ -366,7 +366,7 @@ def __repr__(self):
         return self.local_name
 
 
-class NamespaceSelector(object):
+class NamespaceSelector:
     specificity = 0, 0, 0
 
     def __init__(self, namespace):
@@ -381,7 +381,7 @@ def __repr__(self):
             return '{%s}|' % self.namespace
 
 
-class IDSelector(object):
+class IDSelector:
     specificity = 1, 0, 0
 
     def __init__(self, ident):
@@ -391,7 +391,7 @@ def __repr__(self):
         return '#' + self.ident
 
 
-class ClassSelector(object):
+class ClassSelector:
     specificity = 0, 1, 0
 
     def __init__(self, class_name):
@@ -401,7 +401,7 @@ def __repr__(self):
         return '.' + self.class_name
 
 
-class AttributeSelector(object):
+class AttributeSelector:
     specificity = 0, 1, 0
 
     def __init__(self, namespace, name, operator, value):
@@ -418,7 +418,7 @@ def __repr__(self):
         return '[%s%s%s%r]' % (namespace, self.name, self.operator, self.value)
 
 
-class PseudoClassSelector(object):
+class PseudoClassSelector:
     specificity = 0, 1, 0
 
     def __init__(self, name):
@@ -428,7 +428,7 @@ def __repr__(self):
         return ':' + self.name
 
 
-class FunctionalPseudoClassSelector(object):
+class FunctionalPseudoClassSelector:
     specificity = 0, 1, 0
 
     def __init__(self, name, arguments):
diff --git a/cssselect2/tree.py b/cssselect2/tree.py
index 5786bbf..9c52c50 100644
--- a/cssselect2/tree.py
+++ b/cssselect2/tree.py
@@ -5,7 +5,7 @@
 from .compiler import compile_selector_list, split_whitespace
 
 
-class cached_property(object):
+class cached_property:
     # Borrowed from Werkzeug
     # https://github.com/mitsuhiko/werkzeug/blob/master/werkzeug/utils.py
 
@@ -25,7 +25,7 @@ def __get__(self, obj, type=None, __missing=object()):
         return value
 
 
-class ElementWrapper(object):
+class ElementWrapper:
     """
     A wrapper for an ElementTree :class:`xml.etree.ElementTree.Element`
     for Selector matching.