diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 08820fb9..eb16eb18 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,14 +15,12 @@ jobs:
       fail-fast: false
       matrix:
         python-version:
-          - "2.7"
           - "3.4"
           - "3.5"
           - "3.6"
           - "3.7"
           - "3.8"
           - "3.9"
-          - "pypy2"
           - "pypy3"
     steps:
     - uses: actions/checkout@v2
diff --git a/README.rst b/README.rst
index c64c4a87..692b8935 100644
--- a/README.rst
+++ b/README.rst
@@ -5,7 +5,7 @@ library.
 
 =========================  ========================================
 Current version            2.2.0
-Supported Python versions  2.7, 3.4 - 3.9
+Supported Python versions  3.4 - 3.9
 License                    New BSD
 Project home               https://github.com/mjs/imapclient/
 PyPI                       https://pypi.python.org/pypi/IMAPClient
diff --git a/doc/src/concepts.rst b/doc/src/concepts.rst
index 66f878b5..c69297ea 100644
--- a/doc/src/concepts.rst
+++ b/doc/src/concepts.rst
@@ -102,13 +102,6 @@ When constructing a custom context it is usually best to start with
 the default context, created by the ``ssl`` module, and modify it to
 suit your needs.
 
-.. warning::
-
-  Users of Python 2.7.0 - 2.7.8 can use TLS but cannot configure
-  the settings via an ``ssl.SSLContext``. These Python versions are
-  also not capable of proper certification verification. It is highly
-  encouraged to upgrade to a more recent version of Python.
-
 The following example shows how to to disable certification
 verification and certificate host name checks if required.
 
diff --git a/doc/src/index.rst b/doc/src/index.rst
index f0847b76..11d9c7cf 100644
--- a/doc/src/index.rst
+++ b/doc/src/index.rst
@@ -30,7 +30,7 @@ explains IMAP in detail. Other RFCs also apply to various extensions
 to the base protocol. These are referred to in the documentation below
 where relevant.
 
-Python versions 2.7 and 3.4 through 3.9 are officially supported.
+Python versions 3.4 through 3.9 are officially supported.
 
 Getting Started
 ---------------
diff --git a/imapclient/__init__.py b/imapclient/__init__.py
index 459f85a3..3c40228d 100644
--- a/imapclient/__init__.py
+++ b/imapclient/__init__.py
@@ -5,8 +5,6 @@
 # version_info provides the version number in programmer friendly way.
 # The 4th part will be either alpha, beta or final.
 
-from __future__ import unicode_literals
-
 from .imapclient import *
 from .response_parser import *
 from .tls import *
diff --git a/imapclient/config.py b/imapclient/config.py
index 78a02043..0f5ae495 100644
--- a/imapclient/config.py
+++ b/imapclient/config.py
@@ -2,16 +2,13 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 import json
 from os import environ, path
 import ssl
 
-from six import iteritems
-from six.moves.configparser import SafeConfigParser, NoOptionError
-from six.moves.urllib.request import urlopen
-from six.moves.urllib.parse import urlencode
+import configparser
+import urllib.parse
+import urllib.request
 
 import imapclient
 
@@ -45,7 +42,7 @@ def parse_config_file(filename):
     Used by livetest.py and interact.py
     """
 
-    parser = SafeConfigParser(get_string_config_defaults())
+    parser = configparser.SafeConfigParser(get_string_config_defaults())
     with open(filename, "r") as fh:
         parser.readfp(fh)
 
@@ -62,7 +59,7 @@ def parse_config_file(filename):
 
 def get_string_config_defaults():
     out = {}
-    for k, v in iteritems(get_config_defaults()):
+    for k, v in get_config_defaults().items():
         if v is True:
             v = "true"
         elif v is False:
@@ -80,7 +77,7 @@ def _read_config_section(parser, section):
     def get_allowing_none(name, typefunc):
         try:
             v = parser.get(section, name)
-        except NoOptionError:
+        except configparser.NoOptionError:
             return None
         if not v:
             return None
@@ -133,7 +130,8 @@ def refresh_oauth2_token(hostname, client_id, client_secret, refresh_token):
         refresh_token=refresh_token.encode("ascii"),
         grant_type=b"refresh_token",
     )
-    response = urlopen(url, urlencode(post).encode("ascii")).read()
+    response = urllib.request.urlopen(
+        url, urllib.parse.urlencode(post).encode("ascii")).read()
     return json.loads(response.decode("ascii"))["access_token"]
 
 
diff --git a/imapclient/datetime_util.py b/imapclient/datetime_util.py
index 426a24d7..a10ea0de 100644
--- a/imapclient/datetime_util.py
+++ b/imapclient/datetime_util.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 import re
 from datetime import datetime
 from email.utils import parsedate_tz
diff --git a/imapclient/fixed_offset.py b/imapclient/fixed_offset.py
index ac073093..dd6d9b17 100644
--- a/imapclient/fixed_offset.py
+++ b/imapclient/fixed_offset.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 import time
 from datetime import tzinfo, timedelta
 
diff --git a/imapclient/imap_utf7.py b/imapclient/imap_utf7.py
index 1e1780fc..e516195b 100644
--- a/imapclient/imap_utf7.py
+++ b/imapclient/imap_utf7.py
@@ -6,10 +6,8 @@
 # base64 encoding context), which is & in this modified UTF-7 convention,
 # since + is considered as mainly used in mailbox names.
 # Other variations and examples can be found in the RFC 3501, section 5.1.3.
-from __future__ import unicode_literals
 
 import binascii
-from six import binary_type, text_type, byte2int, iterbytes, unichr
 
 
 def encode(s):
@@ -18,7 +16,7 @@ def encode(s):
     Input is unicode; output is bytes (Python 3) or str (Python 2). If
     non-unicode input is provided, the input is returned unchanged.
     """
-    if not isinstance(s, text_type):
+    if not isinstance(s, str):
         return s
 
     res = bytearray()
@@ -56,8 +54,8 @@ def consume_b64_buffer(buf):
     return bytes(res)
 
 
-AMPERSAND_ORD = byte2int(b"&")
-DASH_ORD = byte2int(b"-")
+AMPERSAND_ORD = ord("&")
+DASH_ORD = ord("-")
 
 
 def decode(s):
@@ -67,13 +65,13 @@ def decode(s):
     unicode. If non-bytes/str input is provided, the input is returned
     unchanged.
     """
-    if not isinstance(s, binary_type):
+    if not isinstance(s, bytes):
         return s
 
     res = []
     # Store base64 substring that will be decoded once stepping on end shift character
     b64_buffer = bytearray()
-    for c in iterbytes(s):
+    for c in s:
         # Shift character without anything in buffer -> starts storing base64 substring
         if c == AMPERSAND_ORD and not b64_buffer:
             b64_buffer.append(c)
@@ -90,7 +88,7 @@ def decode(s):
             b64_buffer.append(c)
         # No buffer initialized yet, should be an ASCII printable char
         else:
-            res.append(unichr(c))
+            res.append(chr(c))
 
     # Decode the remaining buffer if any
     if b64_buffer:
diff --git a/imapclient/imapclient.py b/imapclient/imapclient.py
index 029da4d8..e52a6112 100644
--- a/imapclient/imapclient.py
+++ b/imapclient/imapclient.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 import functools
 import imaplib
 import itertools
@@ -17,8 +15,6 @@
 from operator import itemgetter
 from logging import LoggerAdapter, getLogger
 
-from six import moves, iteritems, text_type, integer_types, PY3, binary_type, iterbytes
-
 from . import exceptions
 from . import imap4
 from . import response_lexer
@@ -28,8 +24,6 @@
 from .response_parser import parse_response, parse_message_list, parse_fetch_response
 from .util import to_bytes, to_unicode, assert_imap_protocol, chunk
 
-xrange = moves.xrange
-
 try:
     from select import poll
 
@@ -38,9 +32,6 @@
     # Fallback to select() on systems that don't support poll()
     POLL_SUPPORT = False
 
-if PY3:
-    long = int  # long is just int in python3
-
 
 logger = getLogger(__name__)
 
@@ -744,11 +735,11 @@ def _proc_folder_list(self, folder_data):
         ret = []
         parsed = parse_response(folder_data)
         for flags, delim, name in chunk(parsed, size=3):
-            if isinstance(name, (int, long)):
+            if isinstance(name, int):
                 # Some IMAP implementations return integer folder names
                 # with quotes. These get parsed to ints so convert them
                 # back to strings.
-                name = text_type(name)
+                name = str(name)
             elif self.folder_encode:
                 name = decode_utf7(name)
 
@@ -838,7 +829,7 @@ def _process_select_response(self, resp):
                 if key == b"PERMANENTFLAGS":
                     out[key] = tuple(match.group("data").split())
 
-        for key, value in iteritems(untagged):
+        for key, value in untagged.items():
             key = key.upper()
             if key in (b"OK", b"PERMANENTFLAGS"):
                 continue  # already handled above
@@ -1190,7 +1181,7 @@ def sort(self, sort_criteria, criteria="ALL", charset="UTF-8"):
         ]
         args.extend(_normalise_search_criteria(criteria, charset))
         ids = self._raw_command_untagged(b"SORT", args, unpack=True)
-        return [long(i) for i in ids.split()]
+        return [int(i) for i in ids.split()]
 
     def thread(self, algorithm="REFERENCES", criteria="ALL", charset="UTF-8"):
         """Return a list of messages threads from the currently
@@ -1276,7 +1267,7 @@ def get_gmail_labels(self, messages):
         response = self.fetch(messages, [b"X-GM-LABELS"])
         response = self._filter_fetch_dict(response, b"X-GM-LABELS")
         return {
-            msg: utf7_decode_sequence(labels) for msg, labels in iteritems(response)
+            msg: utf7_decode_sequence(labels) for msg, labels in response.items()
         }
 
     def add_gmail_labels(self, messages, labels, silent=False):
@@ -1405,10 +1396,7 @@ def append(self, folder, msg, flags=(), msg_time=None):
         """
         if msg_time:
             time_val = '"%s"' % datetime_to_INTERNALDATE(msg_time)
-            if PY3:
-                time_val = to_unicode(time_val)
-            else:
-                time_val = to_bytes(time_val)
+            time_val = to_unicode(time_val)
         else:
             time_val = None
         return self._command_and_check(
@@ -1528,7 +1516,7 @@ def getacl(self, folder):
         data = self._command_and_check("getacl", self._normalise_folder(folder))
         parts = list(response_lexer.TokenSource(data))
         parts = parts[1:]  # First item is folder name
-        return [(parts[i], parts[i + 1]) for i in xrange(0, len(parts), 2)]
+        return [(parts[i], parts[i + 1]) for i in range(0, len(parts), 2)]
 
     @require_capability("ACL")
     def setacl(self, folder, who, what):
@@ -1730,8 +1718,7 @@ def _command_and_check(self, command, *args, **kwargs):
         assert not kwargs, "unexpected keyword args: " + ", ".join(kwargs)
 
         if uid and self.use_uid:
-            if PY3:
-                command = to_unicode(command)  # imaplib must die
+            command = to_unicode(command)  # imaplib must die
             typ, data = self._imap.uid(command, *args)
         else:
             meth = getattr(self._imap, to_unicode(command))
@@ -1749,7 +1736,7 @@ def _gm_label_store(self, cmd, messages, labels, silent):
             cmd, messages, self._normalise_labels(labels), b"X-GM-LABELS", silent=silent
         )
         return (
-            {msg: utf7_decode_sequence(labels) for msg, labels in iteritems(response)}
+            {msg: utf7_decode_sequence(labels) for msg, labels in response.items()}
             if response
             else None
         )
@@ -1772,17 +1759,17 @@ def _store(self, cmd, messages, flags, fetch_key, silent):
         return self._filter_fetch_dict(parse_fetch_response(data), fetch_key)
 
     def _filter_fetch_dict(self, fetch_dict, key):
-        return dict((msgid, data[key]) for msgid, data in iteritems(fetch_dict))
+        return dict((msgid, data[key]) for msgid, data in fetch_dict.items())
 
     def _normalise_folder(self, folder_name):
-        if isinstance(folder_name, binary_type):
+        if isinstance(folder_name, bytes):
             folder_name = folder_name.decode("ascii")
         if self.folder_encode:
             folder_name = encode_utf7(folder_name)
         return _quote(folder_name)
 
     def _normalise_labels(self, labels):
-        if isinstance(labels, (text_type, binary_type)):
+        if isinstance(labels, (str, bytes)):
             labels = (labels,)
         return [_quote(encode_utf7(l)) for l in labels]
 
@@ -1796,7 +1783,7 @@ def welcome(self):
 
 
 def _quote(arg):
-    if isinstance(arg, text_type):
+    if isinstance(arg, str):
         arg = arg.replace("\\", "\\\\")
         arg = arg.replace('"', '\\"')
         q = '"'
@@ -1813,7 +1800,7 @@ def _normalise_search_criteria(criteria, charset=None):
     if not charset:
         charset = "us-ascii"
 
-    if isinstance(criteria, (text_type, binary_type)):
+    if isinstance(criteria, (str, bytes)):
         return [to_bytes(criteria, charset)]
 
     out = []
@@ -1834,7 +1821,7 @@ def _normalise_search_criteria(criteria, charset=None):
 
 
 def _normalise_sort_criteria(criteria, charset=None):
-    if isinstance(criteria, (text_type, binary_type)):
+    if isinstance(criteria, (str, bytes)):
         criteria = [criteria]
     return b"(" + b" ".join(to_bytes(item).upper() for item in criteria) + b")"
 
@@ -1845,7 +1832,7 @@ class _literal(bytes):
     pass
 
 
-class _quoted(binary_type):
+class _quoted(bytes):
     """
     This class holds a quoted bytes value which provides access to the
     unquoted value via the *original* attribute.
@@ -1892,7 +1879,7 @@ def _join_and_paren(items):
 
 
 def _normalise_text_list(items):
-    if isinstance(items, (text_type, binary_type)):
+    if isinstance(items, (str, bytes)):
         items = (items,)
     return (to_unicode(c) for c in items)
 
@@ -1901,14 +1888,14 @@ def join_message_ids(messages):
     """Convert a sequence of messages ids or a single integer message id
     into an id byte string for use with IMAP commands
     """
-    if isinstance(messages, (text_type, binary_type, integer_types)):
+    if isinstance(messages, (str, bytes, int)):
         messages = (to_bytes(messages),)
     return b",".join(_maybe_int_to_bytes(m) for m in messages)
 
 
 def _maybe_int_to_bytes(val):
-    if isinstance(val, integer_types):
-        return str(val).encode("us-ascii") if PY3 else str(val)
+    if isinstance(val, int):
+        return str(val).encode("us-ascii")
     return to_bytes(val)
 
 
@@ -1943,7 +1930,7 @@ def as_triplets(items):
 
 
 def _is8bit(data):
-    return isinstance(data, _literal) or any(b > 127 for b in iterbytes(data))
+    return isinstance(data, _literal) or any(b > 127 for b in data)
 
 
 def _iter_with_last(items):
@@ -1964,7 +1951,7 @@ def __init__(self, d):
         self._d = d
 
     def iteritems(self):
-        for key, value in iteritems(self._d):
+        for key, value in self._d.items():
             yield to_bytes(key), value
 
     # For Python 3 compatibility.
@@ -1998,7 +1985,7 @@ def pop(self, ink, default=_not_present):
 
     def _gen_keys(self, k):
         yield k
-        if isinstance(k, binary_type):
+        if isinstance(k, bytes):
             yield to_unicode(k)
         else:
             yield to_bytes(k)
@@ -2037,7 +2024,7 @@ class IMAPlibLoggerAdapter(LoggerAdapter):
     def process(self, msg, kwargs):
         # msg is usually unicode but see #367. Convert bytes to
         # unicode if required.
-        if isinstance(msg, binary_type):
+        if isinstance(msg, bytes):
             msg = msg.decode("ascii", "ignore")
 
         for command in ("LOGIN", "AUTHENTICATE"):
diff --git a/imapclient/interact.py b/imapclient/interact.py
index 33e40005..791a30c2 100644
--- a/imapclient/interact.py
+++ b/imapclient/interact.py
@@ -4,14 +4,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
-
 from getpass import getpass
 from optparse import OptionParser
 
-from six import iteritems
-
 from .config import parse_config_file, create_client_from_config, get_config_defaults
 
 
@@ -93,7 +88,7 @@ def command_line():
         # Scan through options, filling in defaults and prompting when
         # a compulsory option wasn't provided.
         compulsory_opts = ("host", "username", "password")
-        for name, default_value in iteritems(get_config_defaults()):
+        for name, default_value in get_config_defaults().items():
             value = getattr(opts, name, default_value)
             if name in compulsory_opts and value is None:
                 value = getpass(name + ": ")
diff --git a/imapclient/response_lexer.py b/imapclient/response_lexer.py
index bb1ffcaa..0f82ddd2 100644
--- a/imapclient/response_lexer.py
+++ b/imapclient/response_lexer.py
@@ -9,19 +9,15 @@
 external callers.
 """
 
-from __future__ import unicode_literals
-
-import six
-
 from .util import assert_imap_protocol
 
 __all__ = ["TokenSource"]
 
 CTRL_CHARS = frozenset(c for c in range(32))
 ALL_CHARS = frozenset(c for c in range(256))
-SPECIALS = frozenset(c for c in six.iterbytes(b' ()%"['))
+SPECIALS = frozenset(c for c in b' ()%"[')
 NON_SPECIALS = ALL_CHARS - SPECIALS - CTRL_CHARS
-WHITESPACE = frozenset(c for c in six.iterbytes(b" \t\r\n"))
+WHITESPACE = frozenset(c for c in b" \t\r\n")
 
 BACKSLASH = ord("\\")
 OPEN_SQUARE = ord("[")
@@ -146,7 +142,7 @@ def __init__(self, resp_record):
             self.literal = None
 
     def __iter__(self):
-        return PushableIterator(six.iterbytes(self.src_text))
+        return PushableIterator(self.src_text)
 
 
 class PushableIterator(object):
diff --git a/imapclient/response_parser.py b/imapclient/response_parser.py
index 9fbfeec8..8d48fd9f 100644
--- a/imapclient/response_parser.py
+++ b/imapclient/response_parser.py
@@ -11,21 +11,15 @@
 
 # TODO more exact error reporting
 
-from __future__ import unicode_literals
-
 import re
 import sys
 from collections import defaultdict
 
-import six
-
 from .datetime_util import parse_to_datetime
 from .response_lexer import TokenSource
 from .response_types import BodyData, Envelope, Address, SearchIds
 from .exceptions import ProtocolError
 
-xrange = six.moves.xrange
-
 __all__ = ["parse_response", "parse_message_list"]
 
 
@@ -60,7 +54,7 @@ def parse_message_list(data):
     if not data:
         return SearchIds()
 
-    if six.PY3 and isinstance(data, six.binary_type):
+    if isinstance(data, bytes):
         data = data.decode("ascii")
 
     m = _msg_id_pattern.match(data)
@@ -133,7 +127,7 @@ def parse_fetch_response(text, normalise_times=True, uid_is_key=True):
         # always return the sequence of the message, so it is available
         # even if we return keyed by UID.
         msg_data = {b"SEQ": seq}
-        for i in xrange(0, len(msg_response), 2):
+        for i in range(0, len(msg_response), 2):
             word = msg_response[i].upper()
             value = msg_response[i + 1]
 
diff --git a/imapclient/response_types.py b/imapclient/response_types.py
index b634d2aa..f15d7624 100644
--- a/imapclient/response_types.py
+++ b/imapclient/response_types.py
@@ -2,13 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from collections import namedtuple
 from email.utils import formataddr
 
-import six
-
 from .util import to_unicode
 
 
@@ -120,7 +116,7 @@ def create(cls, response):
         if isinstance(response[0], tuple):
             # Multipart, find where the message part tuples stop
             for i, part in enumerate(response):
-                if isinstance(part, six.binary_type):
+                if isinstance(part, bytes):
                     break
             return cls(([cls.create(part) for part in response[:i]],) + response[i:])
         else:
diff --git a/imapclient/testable_imapclient.py b/imapclient/testable_imapclient.py
index fa546a15..71c79acc 100644
--- a/imapclient/testable_imapclient.py
+++ b/imapclient/testable_imapclient.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from .imapclient import IMAPClient
 
 try:
diff --git a/imapclient/util.py b/imapclient/util.py
index 3773ac83..76e8f9ee 100644
--- a/imapclient/util.py
+++ b/imapclient/util.py
@@ -2,11 +2,7 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
-import six
 import logging
-from six import binary_type, text_type
 
 from . import exceptions
 
@@ -14,7 +10,7 @@
 
 
 def to_unicode(s):
-    if isinstance(s, binary_type):
+    if isinstance(s, bytes):
         try:
             return s.decode("ascii")
         except UnicodeDecodeError:
@@ -28,7 +24,7 @@ def to_unicode(s):
 
 
 def to_bytes(s, charset="ascii"):
-    if isinstance(s, text_type):
+    if isinstance(s, str):
         return s.encode(charset)
     return s
 
@@ -42,5 +38,5 @@ def assert_imap_protocol(condition, message=None):
 
 
 def chunk(lst, size):
-    for i in six.moves.range(0, len(lst), size):
+    for i in range(0, len(lst), size):
         yield lst[i : i + size]
diff --git a/imapclient/version.py b/imapclient/version.py
index b7d627d8..2a4a7813 100644
--- a/imapclient/version.py
+++ b/imapclient/version.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 version_info = (2, 2, 0, "final")
 
 
diff --git a/interact.py b/interact.py
index 3dc431f7..4544ec5e 100755
--- a/interact.py
+++ b/interact.py
@@ -4,8 +4,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from imapclient.interact import main
 
 main()
diff --git a/livetest.py b/livetest.py
index 61f3c876..db78f1d9 100644
--- a/livetest.py
+++ b/livetest.py
@@ -5,8 +5,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import print_function, unicode_literals
-
 import copy
 import imp
 import os
@@ -19,8 +17,6 @@
 from datetime import datetime
 from email.utils import make_msgid
 
-from six import binary_type, text_type, PY3, iteritems
-
 from imapclient.config import parse_config_file, create_client_from_config
 from imapclient.exceptions import IMAPClientError
 from imapclient.fixed_offset import FixedOffset
@@ -170,7 +166,7 @@ def clear_folder(self, folder):
         self.client.expunge()
 
     def add_prefix_to_folder(self, folder):
-        if isinstance(folder, binary_type):
+        if isinstance(folder, bytes):
             return (
                 self.base_folder.encode("ascii")
                 + self.folder_delimiter.encode("ascii")
@@ -219,7 +215,7 @@ class TestGeneral(_TestBase):
 
     def test_alternates(self):
         # Check alternate connection/login configurations.
-        for name, conf in iteritems(self.conf.alternates):
+        for name, conf in self.conf.alternates.items():
             try:
                 client = create_client_from_config(conf)
                 client.logout()
@@ -446,13 +442,13 @@ def test_rename_folder(self):
         for folder in folders:
             self.client.create_folder(folder)
 
-            if isinstance(folder, binary_type):
+            if isinstance(folder, bytes):
                 new_folder = folder + b"x"
             else:
                 new_folder = folder + "x"
 
             resp = self.client.rename_folder(folder, new_folder)
-            self.assertIsInstance(resp, binary_type)
+            self.assertIsInstance(resp, bytes)
             self.assertTrue(len(resp) > 0)
 
             self.assertFalse(self.client.folder_exists(folder))
@@ -510,7 +506,7 @@ def test_idle(self):
         finally:
             text, more_responses = self.client.idle_done()
         self.assertIn((1, b"EXISTS"), responses)
-        self.assertTrue(isinstance(text, binary_type))
+        self.assertTrue(isinstance(text, bytes))
         self.assertGreater(len(text), 0)
         self.assertTrue(isinstance(more_responses, list))
 
@@ -529,7 +525,7 @@ def test_idle(self):
             return
 
         self.assertIn((2, b"EXISTS"), responses)
-        self.assertTrue(isinstance(text, binary_type))
+        self.assertTrue(isinstance(text, bytes))
         self.assertGreater(len(text), 0)
 
     def test_noop(self):
@@ -537,7 +533,7 @@ def test_noop(self):
 
         # Initially there should be no responses
         text, resps = self.client.noop()
-        self.assertTrue(isinstance(text, binary_type))
+        self.assertTrue(isinstance(text, bytes))
         self.assertGreater(len(text), 0)
         self.assertEqual(resps, [])
 
@@ -549,7 +545,7 @@ def test_noop(self):
 
         # Check for this addition in the NOOP data
         msg, resps = self.client.noop()
-        self.assertTrue(isinstance(text, binary_type))
+        self.assertTrue(isinstance(text, bytes))
         self.assertGreater(len(text), 0)
         self.assertTrue(isinstance(resps, list))
         self.assertIn((1, b"EXISTS"), resps)
@@ -614,7 +610,7 @@ def check_append(self, in_message, out_message):
             resp = self.client.append(
                 self.base_folder, in_message, ("abc", "def"), msg_time
             )
-            self.assertIsInstance(resp, binary_type)
+            self.assertIsInstance(resp, bytes)
 
             # Retrieve the just added message and check that all looks well
             self.assertEqual(self.client.select_folder(self.base_folder)[b"EXISTS"], 1)
@@ -1068,7 +1064,7 @@ def test_expunge(self):
 
             # Test empty mailbox
             text, resps = self.client.expunge()
-            self.assertTrue(isinstance(text, binary_type))
+            self.assertTrue(isinstance(text, bytes))
             self.assertGreater(len(text), 0)
             # Some servers return nothing while others (e.g. Exchange) return (0, 'EXISTS')
             self.assertIn(resps, ([], [(0, b"EXISTS")]))
@@ -1078,7 +1074,7 @@ def test_expunge(self):
 
             msg, resps = self.client.expunge()
 
-            self.assertTrue(isinstance(text, binary_type))
+            self.assertTrue(isinstance(text, bytes))
             self.assertGreater(len(text), 0)
             self.assertTrue(isinstance(resps, list))
             if not self.is_gmail():
@@ -1138,7 +1134,7 @@ def quiet_logout(client):
 
 
 def maybe_lower(val):
-    if isinstance(val, (text_type, binary_type)):
+    if isinstance(val, (str, bytes)):
         return val.lower()
     return val
 
@@ -1197,8 +1193,6 @@ def add_test_class(klass, name=None):
         if name is None:
             name = klass.__name__
         else:
-            if not PY3:
-                name = name.encode("ascii")
             klass.__name__ = name
         setattr(live_test_mod, name, klass)
 
diff --git a/setup.py b/setup.py
index cc0efb6e..5c5bed2d 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (c) 2017, Menno Smits
 # Released subject to the New BSD License
@@ -9,17 +9,11 @@
 
 from setuptools import setup
 
-MAJ_MIN_MIC = sys.version_info[:3]
-IS_PY3 = MAJ_MIN_MIC >= (3, 0, 0)
-
 # Read version info
 here = path.dirname(__file__)
 version_file = path.join(here, "imapclient", "version.py")
 info = {}
-if IS_PY3:
-    exec(open(version_file).read(), {}, info)
-else:
-    execfile(version_file, {}, info)
+exec(open(version_file).read(), {}, info)
 
 desc = """\
 IMAPClient is an easy-to-use, Pythonic and complete IMAP client library.
@@ -33,14 +27,12 @@
     * Convenience methods are provided for commonly used functionality.
     * Exceptions are raised when errors occur.
 
-Python versions 2.7 and 3.4 through 3.9 are officially supported.
+Python versions 3.4 through 3.9 are officially supported.
 
 IMAPClient includes comprehensive units tests and automated
 functional tests that can be run against a live IMAP server.
 """
 
-main_deps = ["six"]
-test_deps = ['mock>=1.3.0; python_version < "3.4"']
 doc_deps = ["sphinx"]
 
 setup(
@@ -57,10 +49,9 @@
     download_url="http://menno.io/projects/IMAPClient/IMAPClient-%s.zip" % info["version"],
     packages=["imapclient"],
     package_data=dict(imapclient=["examples/*.py"]),
-    install_requires=main_deps,
-    tests_require=test_deps,
-    extras_require={"test": test_deps, "doc": doc_deps},
+    extras_require={"doc": doc_deps},
     long_description=desc,
+    python_requires=">=3.4.0",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
diff --git a/tests/imapclient_test.py b/tests/imapclient_test.py
index f15956c6..337c1948 100644
--- a/tests/imapclient_test.py
+++ b/tests/imapclient_test.py
@@ -1,5 +1,5 @@
 from imapclient.testable_imapclient import TestableIMAPClient as IMAPClient
-from .util import unittest
+import unittest
 
 
 class IMAPClientTest(unittest.TestCase):
diff --git a/tests/test_auth.py b/tests/test_auth.py
index ccae2df4..5691634e 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -2,8 +2,6 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from imapclient import IMAPClient
 from imapclient.exceptions import LoginError
 from .imapclient_test import IMAPClientTest
diff --git a/tests/test_datetime_util.py b/tests/test_datetime_util.py
index 1a082aac..47816346 100644
--- a/tests/test_datetime_util.py
+++ b/tests/test_datetime_util.py
@@ -2,9 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from datetime import datetime, date
+import unittest
+from unittest.mock import patch
 
 
 from imapclient.datetime_util import (
@@ -14,7 +14,6 @@
     parse_to_datetime,
 )
 from imapclient.fixed_offset import FixedOffset
-from .util import unittest, patch
 
 
 class TestParsing(unittest.TestCase):
diff --git a/tests/test_enable.py b/tests/test_enable.py
index c1d86d54..1f1c1ca5 100644
--- a/tests/test_enable.py
+++ b/tests/test_enable.py
@@ -2,13 +2,11 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
+from unittest.mock import Mock
 
 from imapclient import IMAPClient
 from imapclient.exceptions import IllegalStateError
 from .imapclient_test import IMAPClientTest
-from .util import Mock
 
 
 class TestEnable(IMAPClientTest):
diff --git a/tests/test_fixed_offset.py b/tests/test_fixed_offset.py
index b8890d5b..7e32d121 100644
--- a/tests/test_fixed_offset.py
+++ b/tests/test_fixed_offset.py
@@ -2,12 +2,11 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from datetime import timedelta
+import unittest
+from unittest.mock import Mock, patch, DEFAULT
 
 from imapclient.fixed_offset import FixedOffset
-from .util import unittest, Mock, patch, DEFAULT
 
 
 class TestFixedOffset(unittest.TestCase):
diff --git a/tests/test_folder_status.py b/tests/test_folder_status.py
index 98f83d02..c57e5c24 100644
--- a/tests/test_folder_status.py
+++ b/tests/test_folder_status.py
@@ -2,10 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+from unittest.mock import Mock
 
 from .imapclient_test import IMAPClientTest
-from .util import Mock
 
 
 class TestFolderStatus(IMAPClientTest):
diff --git a/tests/test_imap_utf7.py b/tests/test_imap_utf7.py
index 295aada1..14ca41dc 100644
--- a/tests/test_imap_utf7.py
+++ b/tests/test_imap_utf7.py
@@ -2,12 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
-from six import text_type, binary_type, int2byte, unichr
+import unittest
 
 from imapclient.imap_utf7 import decode, encode
-from tests.util import unittest
 
 
 class IMAP4UTF7TestCase(unittest.TestCase):
@@ -30,13 +27,13 @@ class IMAP4UTF7TestCase(unittest.TestCase):
     def test_encode(self):
         for (input, output) in self.tests:
             encoded = encode(input)
-            self.assertIsInstance(encoded, binary_type)
+            self.assertIsInstance(encoded, bytes)
             self.assertEqual(encoded, output)
 
     def test_decode(self):
         for (input, output) in self.tests:
             decoded = decode(output)
-            self.assertIsInstance(decoded, text_type)
+            self.assertIsInstance(decoded, str)
             self.assertEqual(input, decoded)
 
     def test_printable_singletons(self):
@@ -46,8 +43,8 @@ def test_printable_singletons(self):
         """
         # All printables represent themselves
         for o in list(range(0x20, 0x26)) + list(range(0x27, 0x7F)):
-            self.assertEqual(int2byte(o), encode(unichr(o)))
-            self.assertEqual(unichr(o), decode(int2byte(o)))
+            self.assertEqual(bytes((o,)), encode(chr(o)))
+            self.assertEqual(chr(o), decode(bytes((o,))))
         self.assertEqual(encode("&"), b"&-")
         self.assertEqual(encode("&"), b"&-")
         self.assertEqual(decode(b"&-"), "&")
diff --git a/tests/test_imapclient.py b/tests/test_imapclient.py
index f3b8e51b..d1d00580 100644
--- a/tests/test_imapclient.py
+++ b/tests/test_imapclient.py
@@ -2,16 +2,15 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
+import io
 import itertools
 import socket
 import sys
 import warnings
 from datetime import datetime
 import logging
+from unittest.mock import patch, sentinel, Mock
 
-import six
 from select import POLLIN
 
 from imapclient.exceptions import CapabilityError, IMAPClientError, ProtocolError
@@ -27,7 +26,6 @@
 from imapclient.testable_imapclient import TestableIMAPClient as IMAPClient
 
 from .imapclient_test import IMAPClientTest
-from .util import patch, sentinel, Mock
 
 
 class TestListFolders(IMAPClientTest):
@@ -738,7 +736,7 @@ def test_IMAP_is_patched(self):
         # prevent basicConfig from being executed
         for handler in logging.root.handlers[:]:
             logging.root.removeHandler(handler)
-        log_stream = six.StringIO()
+        log_stream = io.StringIO()
         logging.basicConfig(stream=log_stream, level=logging.DEBUG)
 
         self.client._imap._mesg("two")
@@ -750,23 +748,16 @@ def test_redacted_password(self):
         logger_mock.getEffectiveLevel.return_value = logging.DEBUG
 
         adapter = IMAPlibLoggerAdapter(logger_mock, dict())
-        if six.PY3:
-            adapter.info("""> b'ICHH1 LOGIN foo@bar.org "secret"'""")
-            if sys.version_info >= (3, 6, 4):
-                # LoggerAdapter in Python 3.6.4+ calls logger.log()
-                logger_mock.log.assert_called_once_with(
-                    logging.INFO, "> b'ICHH1 LOGIN **REDACTED**", extra={}
-                )
-            else:
-                # LoggerAdapter in Python 3.4 to 3.6 calls logger._log()
-                logger_mock._log.assert_called_once_with(
-                    logging.INFO, "> b'ICHH1 LOGIN **REDACTED**", (), extra={}
-                )
+        adapter.info("""> b'ICHH1 LOGIN foo@bar.org "secret"'""")
+        if sys.version_info >= (3, 6, 4):
+            # LoggerAdapter in Python 3.6.4+ calls logger.log()
+            logger_mock.log.assert_called_once_with(
+                logging.INFO, "> b'ICHH1 LOGIN **REDACTED**", extra={}
+            )
         else:
-            # LoggerAdapter in Python 2.7 calls logger.info()
-            adapter.info('> ICHH1 LOGIN foo@bar.org "secret"')
-            logger_mock.info.assert_called_once_with(
-                "> ICHH1 LOGIN **REDACTED**", extra={}
+            # LoggerAdapter in Python 3.4 to 3.6 calls logger._log()
+            logger_mock._log.assert_called_once_with(
+                logging.INFO, "> b'ICHH1 LOGIN **REDACTED**", (), extra={}
             )
 
 
diff --git a/tests/test_init.py b/tests/test_init.py
index 2a87cb17..8ecb5744 100644
--- a/tests/test_init.py
+++ b/tests/test_init.py
@@ -2,8 +2,10 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
+import unittest
+from unittest.mock import patch, sentinel, Mock
+
 from imapclient.imapclient import IMAPClient, SocketTimeout
-from .util import unittest, patch, sentinel, Mock
 
 
 class TestInit(unittest.TestCase):
diff --git a/tests/test_response_lexer.py b/tests/test_response_lexer.py
index b89a0646..4914323f 100644
--- a/tests/test_response_lexer.py
+++ b/tests/test_response_lexer.py
@@ -2,12 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
-from six import next
+import unittest
 
 from imapclient.response_lexer import TokenSource
-from tests.util import unittest
 
 
 class TestTokenSource(unittest.TestCase):
diff --git a/tests/test_response_parser.py b/tests/test_response_parser.py
index 3c05f0a9..830f8654 100644
--- a/tests/test_response_parser.py
+++ b/tests/test_response_parser.py
@@ -6,9 +6,9 @@
 Unit tests for the FetchTokeniser and FetchParser classes
 """
 
-from __future__ import unicode_literals
-
+import unittest
 from datetime import datetime
+from unittest.mock import patch
 
 from imapclient.datetime_util import datetime_to_native
 from imapclient.fixed_offset import FixedOffset
@@ -19,8 +19,6 @@
 )
 from imapclient.response_types import Envelope, Address
 from imapclient.exceptions import ProtocolError
-from tests.util import unittest
-from .util import patch
 
 # TODO: test invalid dates and times
 
diff --git a/tests/test_search.py b/tests/test_search.py
index 1937bd83..9fa5a546 100644
--- a/tests/test_search.py
+++ b/tests/test_search.py
@@ -2,16 +2,14 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
 from datetime import date, datetime
+from unittest.mock import Mock
 
 import imaplib
 
 from imapclient.exceptions import InvalidCriteriaError
 from imapclient.imapclient import _quoted
 from .imapclient_test import IMAPClientTest
-from .util import Mock
 
 
 class TestSearchBase(IMAPClientTest):
diff --git a/tests/test_sort.py b/tests/test_sort.py
index fc91f696..0cf91491 100644
--- a/tests/test_sort.py
+++ b/tests/test_sort.py
@@ -2,12 +2,11 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+from unittest.mock import Mock
 
 from imapclient.exceptions import CapabilityError
 
 from .imapclient_test import IMAPClientTest
-from .util import Mock
 
 
 class TestSort(IMAPClientTest):
diff --git a/tests/test_starttls.py b/tests/test_starttls.py
index b343cbce..556d380c 100644
--- a/tests/test_starttls.py
+++ b/tests/test_starttls.py
@@ -2,13 +2,12 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+from unittest.mock import Mock, patch, sentinel
 
 from imapclient.imapclient import IMAPClient
 from imapclient.exceptions import IMAPClientError
 
 from .imapclient_test import IMAPClientTest
-from .util import Mock, patch, sentinel
 
 
 class TestStarttls(IMAPClientTest):
diff --git a/tests/test_store.py b/tests/test_store.py
index 66cd8e9c..439ccdf5 100644
--- a/tests/test_store.py
+++ b/tests/test_store.py
@@ -3,19 +3,16 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
-
-import six
+from unittest.mock import patch, sentinel, Mock
 
 from imapclient.imapclient import DELETED, SEEN, ANSWERED, FLAGGED, DRAFT, RECENT
 from .imapclient_test import IMAPClientTest
-from .util import patch, sentinel, Mock
 
 
 class TestFlagsConsts(IMAPClientTest):
     def test_flags_are_bytes(self):
         for flag in DELETED, SEEN, ANSWERED, FLAGGED, DRAFT, RECENT:
-            if not isinstance(flag, six.binary_type):
+            if not isinstance(flag, bytes):
                 self.fail("%r flag is not bytes" % flag)
 
 
diff --git a/tests/test_thread.py b/tests/test_thread.py
index e85a1edf..71cf8059 100644
--- a/tests/test_thread.py
+++ b/tests/test_thread.py
@@ -2,12 +2,11 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+from unittest.mock import Mock
 
 from imapclient.exceptions import CapabilityError
 
 from .imapclient_test import IMAPClientTest
-from .util import Mock
 
 
 class TestThread(IMAPClientTest):
diff --git a/tests/test_util_functions.py b/tests/test_util_functions.py
index f58c2534..d9ab7cf6 100644
--- a/tests/test_util_functions.py
+++ b/tests/test_util_functions.py
@@ -2,7 +2,7 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+import unittest
 
 from imapclient.exceptions import InvalidCriteriaError, ProtocolError
 from imapclient.imapclient import (
@@ -15,7 +15,6 @@
     _parse_untagged_response,
 )
 from imapclient.util import assert_imap_protocol
-from tests.util import unittest
 
 
 class Test_normalise_text_list(unittest.TestCase):
diff --git a/tests/test_version.py b/tests/test_version.py
index fb7d9a68..9936bc0b 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -2,10 +2,9 @@
 # Released subject to the New BSD License
 # Please see http://en.wikipedia.org/wiki/BSD_licenses
 
-from __future__ import unicode_literals
+import unittest
 
 from imapclient.version import _imapclient_version_string
-from .util import unittest
 
 
 class TestVersionString(unittest.TestCase):
diff --git a/tests/util.py b/tests/util.py
deleted file mode 100644
index 024d8e22..00000000
--- a/tests/util.py
+++ /dev/null
@@ -1,41 +0,0 @@
-# Copyright (c) 2014, Menno Smits
-# Released subject to the New BSD License
-# Please see http://en.wikipedia.org/wiki/BSD_licenses
-
-from __future__ import unicode_literals
-
-try:
-    from unittest.mock import Mock, patch, sentinel, DEFAULT
-except ImportError:
-    from mock import Mock, patch, sentinel, DEFAULT
-
-
-def find_unittest2():
-    import unittest
-
-    if hasattr(unittest, "skip") and hasattr(unittest, "loader"):
-        return unittest  # unittest from stdlib is unittest2, use that
-    try:
-        import unittest2  # try for a separately installed unittest2 package
-    except ImportError:
-        raise ImportError(
-            "unittest2 not installed and unittest in standard library is not unittest2"
-        )
-    else:
-        return unittest2
-
-
-unittest = find_unittest2()
-
-
-def patch_TestCase():
-    TestCase = unittest.TestCase
-    # Older versions of unittest2 don't have
-    # TestCase.assertRaisesRegex and newer version raises warnings
-    # when you use assertRaisesRegexp. This helps deal with the
-    # mismatch.
-    if not hasattr(TestCase, "assertRaisesRegex"):
-        TestCase.assertRaisesRegex = TestCase.assertRaisesRegexp
-
-
-patch_TestCase()
diff --git a/tox.ini b/tox.ini
index cad2c2bf..ac9c7576 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,10 @@
 [tox]
-envlist=py27,py34,py35,py36,py37,py38,py39
+envlist=py34,py35,py36,py37,py38,py39
 requires=sphinx
 
 [testenv]
 commands=python -m unittest 
 
-[testenv:py27]
-setenv=
-  VIRTUALENV_PIP=19.0.1
-  VIRTUALENV_SETUPTOOLS=43.0.0
-deps=mock
-commands=python -m unittest discover
-
 [testenv:py34]
 setenv=
   VIRTUALENV_PIP=19.0.1