diff --git a/.github/workflows/cicd.yml b/.github/workflows/cicd.yml
index 76c86d5d..471d4bd1 100644
--- a/.github/workflows/cicd.yml
+++ b/.github/workflows/cicd.yml
@@ -9,6 +9,12 @@ on:
 
   pull_request:
 
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+
 jobs:
   check-formatting:
     runs-on: ubuntu-latest
diff --git a/poetry.lock b/poetry.lock
index 68d3a009..1f772823 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -431,16 +431,6 @@ files = [
     {file = "flaky-3.7.0.tar.gz", hash = "sha256:3ad100780721a1911f57a165809b7ea265a7863305acb66708220820caf8aa0d"},
 ]
 
-[[package]]
-name = "future"
-version = "0.18.3"
-description = "Clean single-source support for Python 3 and 2"
-optional = false
-python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-files = [
-    {file = "future-0.18.3.tar.gz", hash = "sha256:34a17436ed1e96697a86f9de3d15a3b0be01d8bc8de9c1dffd59fb8234ed5307"},
-]
-
 [[package]]
 name = "identify"
 version = "2.5.35"
@@ -1495,4 +1485,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "2a80fcaa4615afd1da17d46d520b28cc6d0b54a6245ab4e34e4fa20904bc2d82"
+content-hash = "bbcd65bc4c3c6670b39d3442bdbdb98569b938ece98d62ecd3287a3e75fb5ee7"
diff --git a/pyproject.toml b/pyproject.toml
index 79cbbafb..b01b312a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,8 +32,6 @@ termcolor = ">=1.1.0,<2"
 pyparsing = ">=2.0,<3"
 clique = "==1.6.1"
 websocket-client = ">=0.40.0,<1"
-future = ">=0.16.0,<1"
-six = ">=1.13.0,<2"
 platformdirs = ">=4.0.0,<5"
 wheel = "^0.41.2"
 
diff --git a/source/ftrack_api/_weakref.py b/source/ftrack_api/_weakref.py
deleted file mode 100644
index 69cc6f4b..00000000
--- a/source/ftrack_api/_weakref.py
+++ /dev/null
@@ -1,66 +0,0 @@
-"""
-Yet another backport of WeakMethod for Python 2.7.
-Changes include removing exception chaining and adding args to super() calls.
-
-Copyright (c) 2001-2019 Python Software Foundation.All rights reserved.
-
-Full license available in LICENSE.python.
-"""
-from weakref import ref
-
-
-class WeakMethod(ref):
-    """
-    A custom `weakref.ref` subclass which simulates a weak reference to
-    a bound method, working around the lifetime problem of bound methods.
-    """
-
-    __slots__ = "_func_ref", "_meth_type", "_alive", "__weakref__"
-
-    def __new__(cls, meth, callback=None):
-        try:
-            obj = meth.__self__
-            func = meth.__func__
-        except AttributeError:
-            raise TypeError(
-                "argument should be a bound method, not {}".format(type(meth))
-            )
-
-        def _cb(arg):
-            # The self-weakref trick is needed to avoid creating a reference
-            # cycle.
-            self = self_wr()
-            if self._alive:
-                self._alive = False
-                if callback is not None:
-                    callback(self)
-
-        self = ref.__new__(cls, obj, _cb)
-        self._func_ref = ref(func, _cb)
-        self._meth_type = type(meth)
-        self._alive = True
-        self_wr = ref(self)
-        return self
-
-    def __call__(self):
-        obj = super(WeakMethod, self).__call__()
-        func = self._func_ref()
-        if obj is None or func is None:
-            return None
-        return self._meth_type(func, obj)
-
-    def __eq__(self, other):
-        if isinstance(other, WeakMethod):
-            if not self._alive or not other._alive:
-                return self is other
-            return ref.__eq__(self, other) and self._func_ref == other._func_ref
-        return NotImplemented
-
-    def __ne__(self, other):
-        if isinstance(other, WeakMethod):
-            if not self._alive or not other._alive:
-                return self is not other
-            return ref.__ne__(self, other) or self._func_ref != other._func_ref
-        return NotImplemented
-
-    __hash__ = ref.__hash__
diff --git a/source/ftrack_api/accessor/base.py b/source/ftrack_api/accessor/base.py
index 32085a67..50938191 100644
--- a/source/ftrack_api/accessor/base.py
+++ b/source/ftrack_api/accessor/base.py
@@ -1,14 +1,12 @@
 # :coding: utf-8
 # :copyright: Copyright (c) 2013 ftrack
 
-from builtins import object
 import abc
 
 import ftrack_api.exception
-from future.utils import with_metaclass
 
 
-class Accessor(with_metaclass(abc.ABCMeta, object)):
+class Accessor(metaclass=abc.ABCMeta):
     """Provide data access to a location.
 
     A location represents a specific storage, but access to that storage may
diff --git a/source/ftrack_api/attribute.py b/source/ftrack_api/attribute.py
index 4a8fdbab..0a9b158e 100644
--- a/source/ftrack_api/attribute.py
+++ b/source/ftrack_api/attribute.py
@@ -4,8 +4,7 @@
 from __future__ import absolute_import
 
 from builtins import object
-import collections
-from six.moves import collections_abc
+import collections.abc
 import copy
 import logging
 import functools
@@ -538,7 +537,7 @@ def _adapt_to_collection(self, entity, value):
                     value, self.creator, self.key_attribute, self.value_attribute
                 )
 
-            elif isinstance(value, collections_abc.Mapping):
+            elif isinstance(value, collections.abc.Mapping):
                 # Convert mapping.
                 # TODO: When backend model improves, revisit this logic.
                 # First get existing value and delete all references. This is
@@ -612,7 +611,7 @@ def _adapt_to_collection(self, entity, value):
 
                 value = ftrack_api.collection.CustomAttributeCollectionProxy(value)
 
-            elif isinstance(value, collections_abc.Mapping):
+            elif isinstance(value, collections.abc.Mapping):
                 # Convert mapping.
                 # TODO: When backend model improves, revisit this logic.
                 # First get existing value and delete all references. This is
diff --git a/source/ftrack_api/cache.py b/source/ftrack_api/cache.py
index 2ea7ebe4..96ea85b9 100644
--- a/source/ftrack_api/cache.py
+++ b/source/ftrack_api/cache.py
@@ -16,42 +16,24 @@
 """
 
 from builtins import str
-from six import string_types
 from builtins import object
-from six.moves import collections_abc
 import functools
 import abc
+import collections.abc
 import copy
 import inspect
 import re
 
-try:
-    # Python 2.x
-    import anydbm
-except ImportError:
-    import dbm as anydbm
-
-
+import pickle
 import contextlib
-from future.utils import with_metaclass
-
-try:
-    try:
-        import _pickle as pickle
-    except:
-        import six
-        from six.moves import cPickle as pickle
-except:
-    try:
-        import cPickle as pickle
-    except:
-        import pickle
+
+import dbm as anydbm
 
 import ftrack_api.inspection
 import ftrack_api.symbol
 
 
-class Cache(with_metaclass(abc.ABCMeta, object)):
+class Cache(metaclass=abc.ABCMeta):
     """Cache interface.
 
     Derive from this to define concrete cache implementations. A cache is
@@ -378,7 +360,7 @@ def set(self, key, value):
         super(SerialisedCache, self).set(key, value)
 
 
-class KeyMaker(with_metaclass(abc.ABCMeta, object)):
+class KeyMaker(metaclass=abc.ABCMeta):
     """Generate unique keys."""
 
     def __init__(self):
@@ -454,11 +436,11 @@ def __key(self, item):
 
         # TODO: Consider using a more robust and comprehensive solution such as
         # dill (https://github.com/uqfoundation/dill).
-        if isinstance(item, collections_abc.Iterable):
-            if isinstance(item, string_types):
+        if isinstance(item, collections.abc.Iterable):
+            if isinstance(item, str):
                 return pickle.dumps(item, pickle_protocol)
 
-            if isinstance(item, collections_abc.Mapping):
+            if isinstance(item, collections.abc.Mapping):
                 contents = self.item_separator.join(
                     [
                         (
diff --git a/source/ftrack_api/collection.py b/source/ftrack_api/collection.py
index 1e77f906..173827b9 100644
--- a/source/ftrack_api/collection.py
+++ b/source/ftrack_api/collection.py
@@ -7,8 +7,7 @@
 from builtins import str
 import logging
 
-import collections
-from six.moves import collections_abc
+import collections.abc
 import copy
 
 import ftrack_api.exception
@@ -19,7 +18,7 @@
 from ftrack_api.logging import LazyLogMessage as L
 
 
-class Collection(collections_abc.MutableSequence):
+class Collection(collections.abc.MutableSequence):
     """A collection of entities."""
 
     def __init__(self, entity, attribute, mutable=True, data=None):
@@ -152,7 +151,7 @@ def __ne__(self, other):
         return not self == other
 
 
-class MappedCollectionProxy(collections_abc.MutableMapping):
+class MappedCollectionProxy(collections.abc.MutableMapping):
     """Common base class for mapped collection of entities."""
 
     def __init__(self, collection):
diff --git a/source/ftrack_api/data.py b/source/ftrack_api/data.py
index 2f9a3518..8d05d166 100644
--- a/source/ftrack_api/data.py
+++ b/source/ftrack_api/data.py
@@ -5,10 +5,9 @@
 import os
 from abc import ABCMeta, abstractmethod
 import tempfile
-from future.utils import with_metaclass
 
 
-class Data(with_metaclass(ABCMeta, object)):
+class Data(metaclass=ABCMeta):
     """File-like object for manipulating data."""
 
     def __init__(self):
diff --git a/source/ftrack_api/entity/base.py b/source/ftrack_api/entity/base.py
index cf8fa4b7..e0e4e9ee 100644
--- a/source/ftrack_api/entity/base.py
+++ b/source/ftrack_api/entity/base.py
@@ -5,8 +5,7 @@
 
 from builtins import str
 import abc
-import collections
-from six.moves import collections_abc
+import collections.abc
 import logging
 
 import ftrack_api.symbol
@@ -15,7 +14,6 @@
 import ftrack_api.exception
 import ftrack_api.operation
 from ftrack_api.logging import LazyLogMessage as L
-from future.utils import with_metaclass
 
 
 class _EntityBase(object):
@@ -39,9 +37,7 @@ def __repr__(self):
 
 
 class Entity(
-    with_metaclass(
-        DynamicEntityTypeMetaclass, _EntityBase, collections_abc.MutableMapping
-    )
+    _EntityBase, collections.abc.MutableMapping, metaclass=DynamicEntityTypeMetaclass
 ):
     """Base class for all entities."""
 
diff --git a/source/ftrack_api/entity/factory.py b/source/ftrack_api/entity/factory.py
index cda4f0d5..195ebd5d 100644
--- a/source/ftrack_api/entity/factory.py
+++ b/source/ftrack_api/entity/factory.py
@@ -151,10 +151,8 @@ def create(self, schema, bases=None):
         class_namespace["primary_key_attributes"] = schema["primary_key"][:]
         class_namespace["default_projections"] = default_projections
 
-        from future.utils import native_str
-
         cls = type(
-            native_str(class_name),  # type doesn't accept unicode.
+            str(class_name),  # type doesn't accept unicode.
             tuple(class_bases),
             class_namespace,
         )
diff --git a/source/ftrack_api/entity/location.py b/source/ftrack_api/entity/location.py
index 418e345b..3a575fb0 100644
--- a/source/ftrack_api/entity/location.py
+++ b/source/ftrack_api/entity/location.py
@@ -2,10 +2,7 @@
 # :copyright: Copyright (c) 2015 ftrack
 
 from builtins import zip
-from six import string_types
-from builtins import object
-import collections
-from six.moves import collections_abc
+import collections.abc
 import functools
 
 import ftrack_api.entity.base
@@ -15,15 +12,6 @@
 import ftrack_api.inspection
 from ftrack_api.logging import LazyLogMessage as L
 
-from future.utils import with_metaclass
-
-
-MixinBaseClass = with_metaclass(
-    ftrack_api.entity.base.DynamicEntityTypeMetaclass,
-    ftrack_api.entity.base._EntityBase,
-    collections_abc.MutableMapping,
-)
-
 
 class Location(ftrack_api.entity.base.Entity):
     """Represent storage for components."""
@@ -129,8 +117,8 @@ def add_components(self, components, sources, recursive=True, _depth=0):
             issues and any transferred data under the 'transferred' detail key.
 
         """
-        if isinstance(sources, string_types) or not isinstance(
-            sources, collections_abc.Sequence
+        if isinstance(sources, str) or not isinstance(
+            sources, collections.abc.Sequence
         ):
             sources = [sources]
 
@@ -590,7 +578,11 @@ def get_url(self, component):
         return self.accessor.get_url(resource_identifier)
 
 
-class MemoryLocationMixin(MixinBaseClass):
+class MemoryLocationMixin(
+    ftrack_api.entity.base._EntityBase,
+    collections.abc.MutableMapping,
+    metaclass=ftrack_api.entity.base.DynamicEntityTypeMetaclass,
+):
     """Represent storage for components.
 
     Unlike a standard location, only store metadata for components in this
@@ -652,7 +644,11 @@ def _get_resource_identifiers(self, components):
         return resource_identifiers
 
 
-class UnmanagedLocationMixin(MixinBaseClass):
+class UnmanagedLocationMixin(
+    ftrack_api.entity.base._EntityBase,
+    collections.abc.MutableMapping,
+    metaclass=ftrack_api.entity.base.DynamicEntityTypeMetaclass,
+):
     """Location that does not manage data."""
 
     def _add_data(self, component, resource_identifier, source):
@@ -687,7 +683,11 @@ def _get_context(self, component, source):
         return context
 
 
-class ServerLocationMixin(MixinBaseClass):
+class ServerLocationMixin(
+    ftrack_api.entity.base._EntityBase,
+    collections.abc.MutableMapping,
+    metaclass=ftrack_api.entity.base.DynamicEntityTypeMetaclass,
+):
     """Location representing ftrack server.
 
     Adds convenience methods to location, specific to ftrack server.
diff --git a/source/ftrack_api/event/base.py b/source/ftrack_api/event/base.py
index 733b8ca1..fd37cd9e 100644
--- a/source/ftrack_api/event/base.py
+++ b/source/ftrack_api/event/base.py
@@ -3,10 +3,10 @@
 
 from builtins import str
 import uuid
-from six.moves import collections_abc
+import collections.abc
 
 
-class Event(collections_abc.MutableMapping):
+class Event(collections.abc.MutableMapping):
     """Represent a single event."""
 
     def __init__(
diff --git a/source/ftrack_api/event/expression.py b/source/ftrack_api/event/expression.py
index 05ca47bc..6c318ba6 100644
--- a/source/ftrack_api/event/expression.py
+++ b/source/ftrack_api/event/expression.py
@@ -2,7 +2,6 @@
 # :copyright: Copyright (c) 2014 ftrack
 
 from builtins import map
-from six import string_types
 from builtins import object
 from operator import eq, ne, ge, le, gt, lt
 
@@ -266,7 +265,7 @@ def match(self, candidate):
 
         if (
             self._operator is eq
-            and isinstance(self._value, string_types)
+            and isinstance(self._value, str)
             and self._value[-1] == self._wildcard
         ):
             return self._value[:-1] in value
diff --git a/source/ftrack_api/event/hub.py b/source/ftrack_api/event/hub.py
index 937452a9..4e870677 100644
--- a/source/ftrack_api/event/hub.py
+++ b/source/ftrack_api/event/hub.py
@@ -6,8 +6,7 @@
 from builtins import str
 from builtins import range
 from builtins import object
-import collections
-from six.moves import collections_abc
+import collections.abc
 import urllib.parse
 import threading
 import queue as queue
@@ -18,7 +17,6 @@
 import functools
 import json
 import socket
-import warnings
 import ssl
 
 import requests
@@ -129,7 +127,7 @@ def __init__(self, server_url, api_user, api_key, headers=None, cookies=None):
 
         def _validate_mapping(mapping):
             """Validate mapping is a mapping type and return as dict."""
-            if not isinstance(mapping, collections_abc.Mapping):
+            if not isinstance(mapping, collections.abc.Mapping):
                 raise TypeError("Expected mapping, got {0!r}.".format(mapping))
 
             return dict(mapping)
@@ -1014,7 +1012,7 @@ def _handle_packet(self, code, packet_identifier, path, data):
 
             if len(args) == 1:
                 event_payload = args[0]
-                if isinstance(event_payload, collections_abc.Mapping):
+                if isinstance(event_payload, collections.abc.Mapping):
                     try:
                         event = ftrack_api.event.base.Event(**event_payload)
                     except Exception:
@@ -1072,7 +1070,7 @@ def _decode(self, string):
 
     def _decode_object_hook(self, item):
         """Return *item* transformed."""
-        if isinstance(item, collections_abc.Mapping):
+        if isinstance(item, collections.abc.Mapping):
             if "inReplyToEvent" in item:
                 item["in_reply_to_event"] = item.pop("inReplyToEvent")
 
diff --git a/source/ftrack_api/formatter.py b/source/ftrack_api/formatter.py
index 85a36a6b..682af3b4 100644
--- a/source/ftrack_api/formatter.py
+++ b/source/ftrack_api/formatter.py
@@ -76,15 +76,17 @@ def format(
 
     formatters.setdefault(
         "header",
-        lambda text: "\x1b[1m\x1b[44m\x1b[97m{}\x1b[0m\033[0m".format(text)
-        if _can_do_colors()
-        else text,
+        lambda text: (
+            "\x1b[1m\x1b[44m\x1b[97m{}\x1b[0m\033[0m".format(text)
+            if _can_do_colors()
+            else text
+        ),
     )
     formatters.setdefault(
         "label",
-        lambda text: "\x1b[1m\x1b[34m{}\x1b[0m\033[0m".format(text)
-        if _can_do_colors()
-        else text,
+        lambda text: (
+            "\x1b[1m\x1b[34m{}\x1b[0m\033[0m".format(text) if _can_do_colors() else text
+        ),
     )
 
     # Determine indents.
diff --git a/source/ftrack_api/inspection.py b/source/ftrack_api/inspection.py
index a9cd8d1e..d1255c20 100644
--- a/source/ftrack_api/inspection.py
+++ b/source/ftrack_api/inspection.py
@@ -2,7 +2,6 @@
 # :copyright: Copyright (c) 2015 ftrack
 
 from builtins import str
-from future.utils import native_str
 import collections
 
 import ftrack_api.symbol
@@ -32,7 +31,7 @@ def primary_key(entity):
             )
 
         # todo: Compatiblity fix, review for better implementation.
-        primary_key[native_str(name)] = native_str(value)
+        primary_key[str(name)] = str(value)
 
     return primary_key
 
diff --git a/source/ftrack_api/plugin.py b/source/ftrack_api/plugin.py
index 2a28af7b..6e05e8be 100644
--- a/source/ftrack_api/plugin.py
+++ b/source/ftrack_api/plugin.py
@@ -4,69 +4,28 @@
 from __future__ import absolute_import
 
 import logging
-import collections
 import os
 import uuid
 import traceback
 
-try:
-    from inspect import getfullargspec
-
-except ImportError:
-    # getargspec is deprecated in version 3.0. convert `ArgSpec` to a named
-    # tuple `FullArgSpec`. We only rely on the values of varargs and varkw.
-
-    # Implemented with "https://github.com/tensorflow/tensorflow/blob/3d69fd003d4acef0ea5663a4794c1e9a4f6ec998/tensorflow/python/util/tf_inspect.py#L34"
-    # as reference.
-    import inspect
-
-    FullArgSpec = collections.namedtuple(
-        "FullArgSpec",
-        [
-            "args",
-            "varargs",
-            "varkw",
-            "defaults",
-            "kwonlyargs",
-            "kwonlydefaults",
-            "annotations",
-        ],
-    )
-
-    def getfullargspec(func):
-        """a python 2 version of `getfullargspec`."""
-        spec = inspect.getargspec(func)
+import importlib.util
+import importlib.machinery
 
-        return FullArgSpec(
-            args=spec.args,
-            varargs=spec.varargs,
-            varkw=spec.keywords,
-            defaults=spec.defaults,
-            kwonlyargs=[],
-            kwonlydefaults=None,
-            annotations={},
-        )
 
+import inspect
 
-try:
-    from imp import load_source
 
-except ImportError:
-    # The imp module is deprecated in version 3.12. Use importlib instead.
-    import importlib.util
-    import importlib.machinery
+def load_source(modname, filename):
+    # https://docs.python.org/3/whatsnew/3.12.html#imp
 
-    def load_source(modname, filename):
-        # https://docs.python.org/3/whatsnew/3.12.html#imp
-
-        loader = importlib.machinery.SourceFileLoader(modname, filename)
-        module = importlib.util.module_from_spec(
-            importlib.util.spec_from_file_location(modname, filename, loader=loader)
-        )
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    module = importlib.util.module_from_spec(
+        importlib.util.spec_from_file_location(modname, filename, loader=loader)
+    )
 
-        loader.exec_module(module)
+    loader.exec_module(module)
 
-        return module
+    return module
 
 
 def discover(paths, positional_arguments=None, keyword_arguments=None):
@@ -126,7 +85,7 @@ def discover(paths, positional_arguments=None, keyword_arguments=None):
                 else:
                     # Attempt to only pass arguments that are accepted by the
                     # register function.
-                    specification = getfullargspec(module.register)
+                    specification = inspect.getfullargspec(module.register)
 
                     selected_positional_arguments = positional_arguments
                     selected_keyword_arguments = keyword_arguments
diff --git a/source/ftrack_api/query.py b/source/ftrack_api/query.py
index 62c7dd5b..2443cf08 100644
--- a/source/ftrack_api/query.py
+++ b/source/ftrack_api/query.py
@@ -2,12 +2,12 @@
 # :copyright: Copyright (c) 2014 ftrack
 
 import re
-from six.moves import collections_abc
+import collections.abc
 
 import ftrack_api.exception
 
 
-class QueryResult(collections_abc.Sequence):
+class QueryResult(collections.abc.Sequence):
     """Results from a query."""
 
     OFFSET_EXPRESSION = re.compile("(?P<offset>offset (?P<value>\d+))")
diff --git a/source/ftrack_api/session.py b/source/ftrack_api/session.py
index e0d3fa10..ff6f2988 100644
--- a/source/ftrack_api/session.py
+++ b/source/ftrack_api/session.py
@@ -7,12 +7,10 @@
 from builtins import zip
 from builtins import map
 from builtins import str
-from six import string_types
 from builtins import object
 import json
 import logging
-import collections
-from six.moves import collections_abc
+import collections.abc
 import datetime
 import os
 import getpass
@@ -54,10 +52,7 @@
 import ftrack_api.logging
 from ftrack_api.logging import LazyLogMessage as L
 
-try:
-    from weakref import WeakMethod
-except ImportError:
-    from ftrack_api._weakref import WeakMethod
+from weakref import WeakMethod
 
 
 class SessionAuthentication(requests.auth.AuthBase):
@@ -254,12 +249,12 @@ def __init__(
         self._request = requests.Session()
 
         if cookies:
-            if not isinstance(cookies, collections_abc.Mapping):
+            if not isinstance(cookies, collections.abc.Mapping):
                 raise TypeError("The cookies argument is required to be a mapping.")
             self._request.cookies.update(cookies)
 
         if headers:
-            if not isinstance(headers, collections_abc.Mapping):
+            if not isinstance(headers, collections.abc.Mapping):
                 raise TypeError("The headers argument is required to be a mapping.")
 
             headers = dict(headers)
@@ -720,7 +715,7 @@ def ensure(self, entity_type, data, identifying_keys=None):
         for identifying_key in identifying_keys:
             value = data[identifying_key]
 
-            if isinstance(value, string_types):
+            if isinstance(value, str):
                 value = '"{0}"'.format(value)
 
             elif isinstance(value, (arrow.Arrow, datetime.datetime, datetime.date)):
@@ -781,7 +776,7 @@ def get(self, entity_type, entity_key):
         self.logger.debug(L("Get {0} with key {1}", entity_type, entity_key))
 
         primary_key_definition = self.types[entity_type].primary_key_attributes
-        if isinstance(entity_key, string_types):
+        if isinstance(entity_key, str):
             entity_key = [entity_key]
 
         if len(entity_key) != len(primary_key_definition):
@@ -1802,7 +1797,7 @@ def decode(self, string):
 
     def _decode(self, item):
         """Return *item* transformed into appropriate representation."""
-        if isinstance(item, collections_abc.Mapping):
+        if isinstance(item, collections.abc.Mapping):
             if "__type__" in item:
                 if item["__type__"] == "datetime":
                     item = arrow.get(item["value"])
@@ -2204,7 +2199,7 @@ def encode_media(self, media, version_id=None, keep_original="auto"):
         is a FileComponent, and deleted if it is a file path. You can specify
         True or False to change this behavior.
         """
-        if isinstance(media, string_types):
+        if isinstance(media, str):
             # Media is a path to a file.
             server_location = self.get("Location", ftrack_api.symbol.SERVER_LOCATION_ID)
             if keep_original == "auto":
@@ -2412,7 +2407,7 @@ def __exit__(self, exception_type, exception_value, traceback):
         self._session.record_operations = self._current_record_operations
 
 
-class OperationPayload(collections_abc.MutableMapping):
+class OperationPayload(collections.abc.MutableMapping):
     """Represent operation payload."""
 
     def __init__(self, *args, **kwargs):
diff --git a/source/ftrack_api/structure/base.py b/source/ftrack_api/structure/base.py
index bf4a4a4f..266abd56 100644
--- a/source/ftrack_api/structure/base.py
+++ b/source/ftrack_api/structure/base.py
@@ -1,12 +1,10 @@
 # :coding: utf-8
 # :copyright: Copyright (c) 2014 ftrack
 
-from builtins import object
 from abc import ABCMeta, abstractmethod
-from future.utils import with_metaclass
 
 
-class Structure(with_metaclass(ABCMeta, object)):
+class Structure(metaclass=ABCMeta):
     """Structure plugin interface.
 
     A structure plugin should compute appropriate paths for data.
diff --git a/test/unit/entity/test_user.py b/test/unit/entity/test_user.py
index 9a3ab0c3..8e6d6c39 100644
--- a/test/unit/entity/test_user.py
+++ b/test/unit/entity/test_user.py
@@ -1,8 +1,6 @@
 # :coding: utf-8
 # :copyright: Copyright (c) 2016 ftrack
 
-from past.builtins import long
-
 
 def test_force_start_timer(new_user, task):
     """Successfully force starting a timer when another timer is running."""
@@ -31,7 +29,7 @@ def test_timer_creates_timelog(new_user, task, unique_name):
     assert timelog["name"] == unique_name
     assert timelog["comment"] == comment
     assert timelog["start"] == timer_start
-    assert isinstance(timelog["duration"], (int, long, float))
+    assert isinstance(timelog["duration"], (int, float))
     assert timelog["duration"] < 60