diff --git a/linkcheck/ansicolor.py b/linkcheck/ansicolor.py
index 2658948a..efd7c35c 100644
--- a/linkcheck/ansicolor.py
+++ b/linkcheck/ansicolor.py
@@ -249,12 +249,11 @@ else:
     write_color = _write_color_ansi
 
 
-class Colorizer (object):
+class Colorizer:
     """Prints colored messages to streams."""
 
     def __init__ (self, fp):
         """Initialize with given stream (file-like object)."""
-        super(Colorizer, self).__init__()
         self.fp = fp
         if has_colors(fp):
             self.write = self._write_color
@@ -277,7 +276,7 @@ class Colorizer (object):
         return getattr(self.fp, name)
 
 
-class ColoredStreamHandler (logging.StreamHandler, object):
+class ColoredStreamHandler (logging.StreamHandler):
     """Send colored log messages to streams (file-like objects)."""
 
     def __init__ (self, strm=None):
diff --git a/linkcheck/cache/results.py b/linkcheck/cache/results.py
index 051e302f..90b9462b 100644
--- a/linkcheck/cache/results.py
+++ b/linkcheck/cache/results.py
@@ -24,7 +24,7 @@ from ..lock import get_lock
 cache_lock = get_lock("results_cache_lock")
 
 
-class ResultCache(object):
+class ResultCache:
     """
     Thread-safe cache of UrlData.to_wire() results.
     the cache is limited in size since we rather recheck the same URL
diff --git a/linkcheck/cache/robots_txt.py b/linkcheck/cache/robots_txt.py
index 18c30075..d0b6fe6b 100644
--- a/linkcheck/cache/robots_txt.py
+++ b/linkcheck/cache/robots_txt.py
@@ -27,7 +27,7 @@ cache_lock = get_lock("robots.txt_cache_lock")
 robot_lock = get_lock("robots.txt_robot_lock")
 
 
-class RobotsTxt (object):
+class RobotsTxt:
     """
     Thread-safe cache of downloaded robots.txt files.
     format: {cache key (string) -> robots.txt content (RobotFileParser)}
diff --git a/linkcheck/cache/urlqueue.py b/linkcheck/cache/urlqueue.py
index f8300ad7..1961ce28 100644
--- a/linkcheck/cache/urlqueue.py
+++ b/linkcheck/cache/urlqueue.py
@@ -33,7 +33,7 @@ class Empty(Exception):
 
 NUM_PUTS_CLEANUP = 10000
 
-class UrlQueue (object):
+class UrlQueue:
     """A queue supporting several consumer tasks. The task_done() idea is
     from the Python 2.5 implementation of Queue.Queue()."""
 
diff --git a/linkcheck/checker/proxysupport.py b/linkcheck/checker/proxysupport.py
index 6e04b533..cd5a9473 100644
--- a/linkcheck/checker/proxysupport.py
+++ b/linkcheck/checker/proxysupport.py
@@ -28,7 +28,7 @@ import os
 from .. import LinkCheckerError, log, LOG_CHECK, url as urlutil, httputil
 
 
-class ProxySupport (object):
+class ProxySupport:
     """Get support for proxying and for URLs with user:pass@host setting."""
 
     def set_proxy (self, proxy):
diff --git a/linkcheck/checker/urlbase.py b/linkcheck/checker/urlbase.py
index dddeccca..72fe1e48 100644
--- a/linkcheck/checker/urlbase.py
+++ b/linkcheck/checker/urlbase.py
@@ -80,7 +80,7 @@ def url_norm (url, encoding):
         raise LinkCheckerError(msg)
 
 
-class UrlBase (object):
+class UrlBase:
     """An URL with additional information like validity etc."""
 
     # file types that can be parsed recursively
@@ -857,7 +857,7 @@ urlDataAttr = [
     'level',
 ]
 
-class CompactUrlData (object):
+class CompactUrlData:
     """Store selected UrlData attributes in slots to minimize memory usage."""
     __slots__ = urlDataAttr
 
diff --git a/linkcheck/configuration/confparse.py b/linkcheck/configuration/confparse.py
index dce3bcbc..421f0d03 100644
--- a/linkcheck/configuration/confparse.py
+++ b/linkcheck/configuration/confparse.py
@@ -32,7 +32,7 @@ def read_multiline (value):
         yield line
 
 
-class LCConfigParser (RawConfigParser, object):
+class LCConfigParser (RawConfigParser):
     """
     Parse a LinkChecker configuration file.
     """
diff --git a/linkcheck/decorators.py b/linkcheck/decorators.py
index 90d502bd..fc5fab13 100644
--- a/linkcheck/decorators.py
+++ b/linkcheck/decorators.py
@@ -135,7 +135,7 @@ def timed (log=sys.stderr, limit=2.0):
     return lambda func: timeit(func, log, limit)
 
 
-class curried (object):
+class curried:
     """Decorator that returns a function that keeps returning functions
     until all arguments are supplied; then the original function is
     evaluated."""
diff --git a/linkcheck/director/aggregator.py b/linkcheck/director/aggregator.py
index 8c90c681..6600b3e4 100644
--- a/linkcheck/director/aggregator.py
+++ b/linkcheck/director/aggregator.py
@@ -56,7 +56,7 @@ def new_request_session(config, cookies):
     return session
 
 
-class Aggregate (object):
+class Aggregate:
     """Store thread-safe data collections for checker threads."""
 
     def __init__ (self, config, urlqueue, robots_txt, plugin_manager,
diff --git a/linkcheck/director/console.py b/linkcheck/director/console.py
index 2b15462c..2d962072 100644
--- a/linkcheck/director/console.py
+++ b/linkcheck/director/console.py
@@ -26,7 +26,7 @@ stderr = i18n.get_encoded_writer(out=sys.stderr)
 stdout = i18n.get_encoded_writer()
 
 
-class StatusLogger (object):
+class StatusLogger:
     """Standard status logger. Default output is stderr."""
 
     def __init__ (self, fd=stderr):
diff --git a/linkcheck/director/logger.py b/linkcheck/director/logger.py
index 569421e7..51f13014 100644
--- a/linkcheck/director/logger.py
+++ b/linkcheck/director/logger.py
@@ -23,7 +23,7 @@ from ..decorators import synchronized
 _lock = threading.Lock()
 
 
-class Logger (object):
+class Logger:
     """Thread safe multi-logger class used by aggregator instances."""
 
     def __init__ (self, config):
diff --git a/linkcheck/dummy.py b/linkcheck/dummy.py
index 3667104b..dc8ef97c 100644
--- a/linkcheck/dummy.py
+++ b/linkcheck/dummy.py
@@ -17,7 +17,7 @@
 Dummy objects.
 """
 
-class Dummy (object):
+class Dummy:
     """A dummy object ignores all access to it. Useful for testing."""
 
     def __init__ (self, *args, **kwargs):
diff --git a/linkcheck/fileutil.py b/linkcheck/fileutil.py
index 50c0fa41..a8e9bf11 100644
--- a/linkcheck/fileutil.py
+++ b/linkcheck/fileutil.py
@@ -44,7 +44,7 @@ def has_module (name, without_error=True):
         return not without_error
 
 
-class GlobDirectoryWalker (object):
+class GlobDirectoryWalker:
     """A forward iterator that traverses a directory tree."""
 
     def __init__ (self, directory, pattern="*"):
@@ -78,7 +78,7 @@ class GlobDirectoryWalker (object):
 rglob = GlobDirectoryWalker
 
 
-class Buffer (object):
+class Buffer:
     """Holds buffered data"""
 
     def __init__ (self, empty=''):
diff --git a/linkcheck/htmlutil/loginformsearch.py b/linkcheck/htmlutil/loginformsearch.py
index fdddb585..0beb69e8 100644
--- a/linkcheck/htmlutil/loginformsearch.py
+++ b/linkcheck/htmlutil/loginformsearch.py
@@ -19,7 +19,7 @@ HTML form utils
 from ..htmlutil import htmlsoup
 from .. import log, LOG_CHECK
 
-class Form(object):
+class Form:
     """Store HTML form URL and form data."""
 
     def __init__(self, url):
diff --git a/linkcheck/lc_cgi.py b/linkcheck/lc_cgi.py
index a7d1f2b9..f62b7df2 100644
--- a/linkcheck/lc_cgi.py
+++ b/linkcheck/lc_cgi.py
@@ -93,7 +93,7 @@ def formvalue (form, key):
 
 
 _lock = threading.Lock()
-class ThreadsafeIO (object):
+class ThreadsafeIO:
     """Thread-safe unicode I/O class."""
 
     def __init__(self):
diff --git a/linkcheck/lock.py b/linkcheck/lock.py
index 342e3359..66d30dac 100644
--- a/linkcheck/lock.py
+++ b/linkcheck/lock.py
@@ -33,7 +33,7 @@ def get_lock (name, debug=False):
     return lock
 
 
-class DebugLock (object):
+class DebugLock:
     """Debugging lock class."""
 
     def __init__ (self, lock, name):
diff --git a/linkcheck/logger/__init__.py b/linkcheck/logger/__init__.py
index 934c40ad..8a3054e2 100644
--- a/linkcheck/logger/__init__.py
+++ b/linkcheck/logger/__init__.py
@@ -57,7 +57,7 @@ ContentTypes = dict(
 )
 
 
-class LogStatistics (object):
+class LogStatistics:
     """Gather log statistics:
     - number of errors, warnings and valid links
     - type of contents (image, video, audio, text, ...)
diff --git a/linkcheck/parser/sitemap.py b/linkcheck/parser/sitemap.py
index 68ebe3c3..1c15674f 100644
--- a/linkcheck/parser/sitemap.py
+++ b/linkcheck/parser/sitemap.py
@@ -20,7 +20,7 @@ from xml.parsers.expat import ParserCreate
 from xml.parsers.expat import ExpatError
 from ..checker.const import (WARN_XML_PARSE_ERROR)
 
-class XmlTagUrlParser(object):
+class XmlTagUrlParser:
     """Parse XML files and find URLs in text content of a tag name."""
 
     def __init__(self, tag):
diff --git a/linkcheck/plugins/__init__.py b/linkcheck/plugins/__init__.py
index b59364f4..4a21678f 100644
--- a/linkcheck/plugins/__init__.py
+++ b/linkcheck/plugins/__init__.py
@@ -20,7 +20,7 @@ from .. import loader, log, LOG_PLUGIN
 from ..decorators import notimplemented
 
 
-class _PluginBase(object):
+class _PluginBase:
     """Basic plugin class featuring plugin identification and
     helper functions."""
 
@@ -75,7 +75,7 @@ def get_plugin_classes(modules):
     return loader.get_plugins(modules, classes)
 
 
-class PluginManager(object):
+class PluginManager:
     """Manage all connection and content plugins."""
 
     def __init__(self, config):
diff --git a/linkcheck/plugins/syntaxchecks.py b/linkcheck/plugins/syntaxchecks.py
index b6f7d8ad..4cb02ec1 100644
--- a/linkcheck/plugins/syntaxchecks.py
+++ b/linkcheck/plugins/syntaxchecks.py
@@ -25,7 +25,7 @@ from ..decorators import synchronized
 _w3_time_lock = threading.Lock()
 
 
-class W3Timer(object):
+class W3Timer:
     """Ensure W3C apis are not hammered."""
 
     # every X seconds
diff --git a/linkcheck/plugins/viruscheck.py b/linkcheck/plugins/viruscheck.py
index 41c50067..fdba476d 100644
--- a/linkcheck/plugins/viruscheck.py
+++ b/linkcheck/plugins/viruscheck.py
@@ -70,7 +70,7 @@ class ClamavError (Exception):
     pass
 
 
-class ClamdScanner (object):
+class ClamdScanner:
     """Virus scanner using a clamd daemon process."""
 
     def __init__ (self, clamav_conf):
diff --git a/linkcheck/robotparser2.py b/linkcheck/robotparser2.py
index 5932b0f9..4d202053 100644
--- a/linkcheck/robotparser2.py
+++ b/linkcheck/robotparser2.py
@@ -38,7 +38,7 @@ __all__ = ["RobotFileParser"]
 ACCEPT_ENCODING = 'x-gzip,gzip,deflate'
 
 
-class RobotFileParser (object):
+class RobotFileParser:
     """This class provides a set of methods to read, parse and answer
     questions about a single robots.txt file."""
 
@@ -271,7 +271,7 @@ class RobotFileParser (object):
         return "\n\n".join(lines)
 
 
-class RuleLine (object):
+class RuleLine:
     """A rule line is a single "Allow:" (allowance==1) or "Disallow:"
     (allowance==0) followed by a path.
     """
@@ -302,7 +302,7 @@ class RuleLine (object):
         return ("Allow" if self.allowance else "Disallow")+": "+self.path
 
 
-class Entry (object):
+class Entry:
     """An entry has one or more user-agents and zero or more rulelines."""
 
     def __init__ (self):
diff --git a/tests/checker/httpserver.py b/tests/checker/httpserver.py
index e6920f95..fb634685 100644
--- a/tests/checker/httpserver.py
+++ b/tests/checker/httpserver.py
@@ -32,7 +32,7 @@ from . import LinkCheckTest
 from .. import get_file
 
 
-class StoppableHttpRequestHandler (SimpleHTTPRequestHandler, object):
+class StoppableHttpRequestHandler (SimpleHTTPRequestHandler):
     """
     HTTP request handler with QUIT stopping the server.
     """
@@ -57,7 +57,7 @@ StoppableHttpRequestHandler.extensions_map.update({
 })
 
 
-class StoppableHttpServer (HTTPServer, object):
+class StoppableHttpServer (HTTPServer):
     """
     HTTP server that reacts to self.stop flag.
     """