diff --git a/.drone.yml b/.drone.yml
index 513bd3a..0a42de2 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -17,6 +17,17 @@ steps:
   depends_on:
     - clone
 
+- name: coverage
+  image: plugins/codecov
+  settings:
+    token:
+      from_secret: codecov_token
+    files:
+      - '*.xml'
+    required: true
+  depends_on:
+    - python3.8
+
 - name: python3.7
   image: python:3.7
   commands:
@@ -33,22 +44,6 @@ steps:
   depends_on:
     - clone
 
-- name: python2.7
-  image: python:2.7
-  commands:
-    - pip install tox
-    - tox -e $(tox -l | grep py27 | paste -sd ",")
-  depends_on:
-    - clone
-
-- name: pypy
-  image: pypy:2.7
-  commands:
-    - pip install tox
-    - tox -e $(tox -l | grep pypy- | paste -sd ",")
-  depends_on:
-    - clone
-
 - name: pypy3
   image: pypy:3.6
   commands:
@@ -61,17 +56,6 @@ steps:
   depends_on:
     - clone
 
-- name: coverage
-  image: plugins/codecov
-  settings:
-    token:
-      from_secret: codecov_token
-    files:
-      - '*.xml'
-    required: true
-  depends_on:
-    - python3.8
-
 trigger:
   trigger:
     ref:
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f6cbf7b..35fb72e 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -19,11 +19,14 @@ repos:
         args: [--allow-multiple-documents]
       - id: debug-statements
       - id: end-of-file-fixer
-      - id: fix-encoding-pragma
-      - id: flake8
       - id: mixed-line-ending
       - id: trailing-whitespace
 
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 'master'
+    hooks:
+      - id: flake8
+
   - repo: https://github.com/miki725/importanize
     rev: 'master'
     hooks:
@@ -31,10 +34,10 @@ repos:
         language_version: python3
 
   - repo: https://github.com/python/black
-    rev: 'master'
+    rev: 'stable'
     hooks:
       - id: black
-        args: [--line-length=88, --safe]
+        args: [--line-length=88, --safe, --check, --diff]
         language_version: python3
         exclude: test_data/.*$
 
diff --git a/.travis.yml b/.travis.yml
index 7ca23a0..c3f016c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,9 +15,8 @@ addons:
 
 language: python
 python:
-  - "3.6-dev"
-  - "3.7-dev"
-  - "2.7"
+  - "3.6"
+  - "3.7"
   - "pypy"
   - "pypy3.5-7.0"
 
diff --git a/docs/conf.py b/docs/conf.py
index 9678a00..c44351f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 #
 # This file is execfile()d with the current directory set to its
 # containing dir.
diff --git a/manage.py b/manage.py
index d4f0ee8..307d211 100755
--- a/manage.py
+++ b/manage.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
 import os
 import sys
 
diff --git a/requirements.txt b/requirements.txt
index 3507dae..5b0f7a9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 cached-property
-Django>=1.8
+Django>=2.2
 enum-compat
-six
diff --git a/setup.py b/setup.py
index 04e153a..32e4cac 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,4 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-from __future__ import print_function
 import os
 
 from setuptools import find_packages, setup
@@ -41,10 +39,10 @@ def read(fname):
         "Intended Audience :: Developers",
         "Natural Language :: English",
         "License :: OSI Approved :: MIT License",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
         "Development Status :: 2 - Pre-Alpha",
     ],
 )
diff --git a/test_project/__init__.py b/test_project/__init__.py
index 8f4a3fc..e69de29 100644
--- a/test_project/__init__.py
+++ b/test_project/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
diff --git a/test_project/alchemy.py b/test_project/alchemy.py
index a3f54e9..00ea8e1 100644
--- a/test_project/alchemy.py
+++ b/test_project/alchemy.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from sqlalchemy.ext.declarative import declarative_base
 
 
diff --git a/test_project/generic/__init__.py b/test_project/generic/__init__.py
index ba25ec7..e69de29 100644
--- a/test_project/generic/__init__.py
+++ b/test_project/generic/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
diff --git a/test_project/generic/api.py b/test_project/generic/api.py
index 4d79b63..700a57e 100644
--- a/test_project/generic/api.py
+++ b/test_project/generic/api.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from rest_framework import serializers
 from rest_framework.viewsets import ModelViewSet
 
diff --git a/test_project/generic/models.py b/test_project/generic/models.py
index 6227ed0..6d0bcba 100644
--- a/test_project/generic/models.py
+++ b/test_project/generic/models.py
@@ -1,13 +1,8 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
-import six
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class ModelA(models.Model):
     name = models.CharField(max_length=64)
 
@@ -15,7 +10,6 @@ def __str__(self):
         return self.name
 
 
-@six.python_2_unicode_compatible
 class ModelB(models.Model):
     name = models.CharField(max_length=64)
     a = models.ForeignKey(
diff --git a/test_project/many_to_many/alchemy.py b/test_project/many_to_many/alchemy.py
index e3f6b28..3b6c6e9 100644
--- a/test_project/many_to_many/alchemy.py
+++ b/test_project/many_to_many/alchemy.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from sqlalchemy import Column, Integer, String
 from sqlalchemy.orm import backref, relationship
 from sqlalchemy.schema import ForeignKey, Table
diff --git a/test_project/many_to_many/api.py b/test_project/many_to_many/api.py
index 4faa4ae..35c7679 100644
--- a/test_project/many_to_many/api.py
+++ b/test_project/many_to_many/api.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 from rest_framework.serializers import ModelSerializer
 from rest_framework.viewsets import ReadOnlyModelViewSet
 
diff --git a/test_project/many_to_many/models.py b/test_project/many_to_many/models.py
index c759368..fcaf53f 100644
--- a/test_project/many_to_many/models.py
+++ b/test_project/many_to_many/models.py
@@ -1,11 +1,6 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Publication(models.Model):
     title = models.CharField(max_length=30)
 
@@ -16,7 +11,6 @@ class Meta:
         ordering = ("title",)
 
 
-@six.python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=100)
     publications = models.ManyToManyField(Publication, related_name="articles")
diff --git a/test_project/many_to_one/alchemy.py b/test_project/many_to_one/alchemy.py
index 381fcfc..563f202 100644
--- a/test_project/many_to_one/alchemy.py
+++ b/test_project/many_to_one/alchemy.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from sqlalchemy import Column, Date, Integer, String
 from sqlalchemy.orm import backref, relationship
 
diff --git a/test_project/many_to_one/api.py b/test_project/many_to_one/api.py
index c02df33..96c4b19 100644
--- a/test_project/many_to_one/api.py
+++ b/test_project/many_to_one/api.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 from rest_framework.serializers import ModelSerializer
 from rest_framework.viewsets import ReadOnlyModelViewSet
 
diff --git a/test_project/many_to_one/models.py b/test_project/many_to_one/models.py
index 398422e..65fb93c 100644
--- a/test_project/many_to_one/models.py
+++ b/test_project/many_to_one/models.py
@@ -1,11 +1,6 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Reporter(models.Model):
     first_name = models.CharField(max_length=30)
     last_name = models.CharField(max_length=30)
@@ -15,7 +10,6 @@ def __str__(self):
         return "%s %s" % (self.first_name, self.last_name)
 
 
-@six.python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=100)
     pub_date = models.DateField()
diff --git a/test_project/middleware.py b/test_project/middleware.py
index 8a67928..6a57ec2 100644
--- a/test_project/middleware.py
+++ b/test_project/middleware.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 from django.conf import settings
 from sqlalchemy.orm import sessionmaker
 
diff --git a/test_project/one_to_one/alchemy.py b/test_project/one_to_one/alchemy.py
index ebc6893..693049b 100644
--- a/test_project/one_to_one/alchemy.py
+++ b/test_project/one_to_one/alchemy.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from sqlalchemy import Boolean, Column, Integer, String
 from sqlalchemy.orm import backref, relationship
 
diff --git a/test_project/one_to_one/api.py b/test_project/one_to_one/api.py
index 2f5cf91..26a271d 100644
--- a/test_project/one_to_one/api.py
+++ b/test_project/one_to_one/api.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
 import operator
 
 from django import forms
diff --git a/test_project/one_to_one/models.py b/test_project/one_to_one/models.py
index 8cd89fc..c51ddf8 100644
--- a/test_project/one_to_one/models.py
+++ b/test_project/one_to_one/models.py
@@ -1,11 +1,6 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Place(models.Model):
     name = models.CharField(max_length=50)
     address = models.CharField(max_length=80)
@@ -14,7 +9,6 @@ def __str__(self):
         return "%s the place" % self.name
 
 
-@six.python_2_unicode_compatible
 class Restaurant(models.Model):
     place = models.OneToOneField(Place, primary_key=True, on_delete=models.CASCADE)
     serves_hot_dogs = models.BooleanField(default=False)
@@ -24,7 +18,6 @@ def __str__(self):
         return "%s the restaurant" % self.place.name
 
 
-@six.python_2_unicode_compatible
 class Waiter(models.Model):
     restaurant = models.ForeignKey(Restaurant, on_delete=models.CASCADE)
     name = models.CharField(max_length=50)
diff --git a/test_project/settings.py b/test_project/settings.py
index 6539748..e560229 100644
--- a/test_project/settings.py
+++ b/test_project/settings.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Bare ``settings.py`` for running tests for url_filter
 import os
 
diff --git a/test_project/urls.py b/test_project/urls.py
index 0e4280f..9853eac 100644
--- a/test_project/urls.py
+++ b/test_project/urls.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import debug_toolbar
 from django.conf import settings
 from django.conf.urls import url
diff --git a/tests/__init__.py b/tests/__init__.py
index 8f4a3fc..e69de29 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
diff --git a/tests/backends/__init__.py b/tests/backends/__init__.py
index ba25ec7..e69de29 100644
--- a/tests/backends/__init__.py
+++ b/tests/backends/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
diff --git a/tests/backends/test_django.py b/tests/backends/test_django.py
index 3c68ace..a3397ce 100644
--- a/tests/backends/test_django.py
+++ b/tests/backends/test_django.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 import mock
 
 from test_project.one_to_one.models import Place
diff --git a/tests/backends/test_plain.py b/tests/backends/test_plain.py
index ef29dec..f06fd9d 100644
--- a/tests/backends/test_plain.py
+++ b/tests/backends/test_plain.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 from datetime import datetime
 
 from url_filter.backends.plain import PlainFilterBackend
diff --git a/tests/backends/test_sqlalchemy.py b/tests/backends/test_sqlalchemy.py
index 65a6a39..4c64a84 100644
--- a/tests/backends/test_sqlalchemy.py
+++ b/tests/backends/test_sqlalchemy.py
@@ -1,8 +1,4 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 import pytest
-import six
 from alchemy_mock.comparison import ExpressionMatcher
 from sqlalchemy import func
 from sqlalchemy.orm import joinedload
@@ -34,7 +30,7 @@ def test_empty(self, alchemy_db):
             alchemy_db.query(Place), context={"context": "here"}
         )
 
-        assert "WHERE 0 = 1" in six.text_type(backend.empty())
+        assert "WHERE 0 = 1" in str(backend.empty())
 
     def test_get_model(self, alchemy_db):
         backend = SQLAlchemyFilterBackend(alchemy_db.query(Place))
@@ -57,7 +53,7 @@ def test_filter(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" not in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" not in sql
@@ -77,7 +73,7 @@ def test_filter_already_selectinload(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" not in sql
@@ -97,7 +93,7 @@ def test_filter_already_eagerloaded(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" in sql
diff --git a/tests/conftest.py b/tests/conftest.py
index 53688be..f8146d9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import pytest
 from django.conf import settings
 from django.core.management import call_command
diff --git a/tests/filtersets/__init__.py b/tests/filtersets/__init__.py
index 8f4a3fc..e69de29 100644
--- a/tests/filtersets/__init__.py
+++ b/tests/filtersets/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
diff --git a/tests/filtersets/test_base.py b/tests/filtersets/test_base.py
index cc3d772..f4d7e04 100644
--- a/tests/filtersets/test_base.py
+++ b/tests/filtersets/test_base.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import pytest
 from django import forms
 from django.http import QueryDict
diff --git a/tests/filtersets/test_django.py b/tests/filtersets/test_django.py
index 07761f7..2a158fd 100644
--- a/tests/filtersets/test_django.py
+++ b/tests/filtersets/test_django.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import pytest
 from django import forms
 from django.db import models
diff --git a/tests/filtersets/test_plain.py b/tests/filtersets/test_plain.py
index b33b7d4..0c296d8 100644
--- a/tests/filtersets/test_plain.py
+++ b/tests/filtersets/test_plain.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 from django import forms
 
 from url_filter.filters import Filter
diff --git a/tests/filtersets/test_sqlalchemy.py b/tests/filtersets/test_sqlalchemy.py
index b35c19c..d505310 100644
--- a/tests/filtersets/test_sqlalchemy.py
+++ b/tests/filtersets/test_sqlalchemy.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import pytest
 from django import forms
 from sqlalchemy.orm.properties import ColumnProperty
diff --git a/tests/integrations/__init__.py b/tests/integrations/__init__.py
index 8f4a3fc..e69de29 100644
--- a/tests/integrations/__init__.py
+++ b/tests/integrations/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
diff --git a/tests/integrations/test_drf.py b/tests/integrations/test_drf.py
index 9d474aa..b8872ee 100644
--- a/tests/integrations/test_drf.py
+++ b/tests/integrations/test_drf.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import mock
 import pytest
 from django.core.exceptions import ValidationError as DjangoValidationError
diff --git a/tests/integrations/test_drf_coreapi.py b/tests/integrations/test_drf_coreapi.py
index 3e26869..93dcc1b 100644
--- a/tests/integrations/test_drf_coreapi.py
+++ b/tests/integrations/test_drf_coreapi.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from rest_framework.viewsets import ModelViewSet
 
 from test_project.one_to_one.models import Restaurant
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 5c842f9..d0a03ab 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 import pytest
 from django import forms
 
diff --git a/tests/test_filters.py b/tests/test_filters.py
index b76edaf..5457d66 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
 from functools import partial
 
 import mock
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 5120f29..d910434 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import print_function, unicode_literals
-
 from url_filter.utils import FilterSpec, LookupConfig, SubClassDict, dictify
 
 
diff --git a/tox.ini b/tox.ini
index c01a164..70acd81 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,15 +1,15 @@
 [tox]
 envlist =
-    {py27,py36,py37,py38,pypy,pypy3}-django{18,11}
-    {py36,py37,py38,pypy3}-django{20,latest}
+    {py35,py36,py37,pypy3}-django22
+    {py36,py37,py38,pypy3}-django30
+    {py36,py37,py38,pypy3}-djangolatest
 
 [testenv]
 basepython =
-    py27: python2.7
+    py35: python3.5
     py36: python3.6
     py37: python3.7
     py38: python3.8
-    pypy: pypy
     pypy3: pypy3
 passenv = *
 setenv =
@@ -18,11 +18,8 @@ commands =
     make install INSTALL_LOG=/dev/null
     make clean-build clean-pyc clean-test test
 deps =
-    django18: django<1.9
-    django18: djangorestframework<3.7
-    django18: django-debug-toolbar<1.10
-    django11: django<2
-    django20: django<2.1
+    django22: django==2.2
+    django30: django==3.0
     djangolatest: django
 whitelist_externals =
     make
diff --git a/url_filter/__init__.py b/url_filter/__init__.py
index d47e8c8..783a9ba 100644
--- a/url_filter/__init__.py
+++ b/url_filter/__init__.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
-
 __author__ = "Miroslav Shubernetskiy"
 __email__ = "miroslav@miki725.com"
 __version__ = "0.3.15"
diff --git a/url_filter/backends/__init__.py b/url_filter/backends/__init__.py
index ba25ec7..e69de29 100644
--- a/url_filter/backends/__init__.py
+++ b/url_filter/backends/__init__.py
@@ -1,2 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
diff --git a/url_filter/backends/base.py b/url_filter/backends/base.py
index e9edba8..5499f8c 100644
--- a/url_filter/backends/base.py
+++ b/url_filter/backends/base.py
@@ -1,12 +1,9 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import abc
 
-import six
 from cached_property import cached_property
 
 
-class BaseFilterBackend(six.with_metaclass(abc.ABCMeta, object)):
+class BaseFilterBackend(metaclass=abc.ABCMeta):
     """
     Base filter backend from which all other backends must subclass.
 
diff --git a/url_filter/backends/django.py b/url_filter/backends/django.py
index 48aa2c3..a559ff8 100644
--- a/url_filter/backends/django.py
+++ b/url_filter/backends/django.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from django.core.exceptions import FieldDoesNotExist
 from django.db.models.constants import LOOKUP_SEP
 
diff --git a/url_filter/backends/plain.py b/url_filter/backends/plain.py
index f2cb8e7..31e7dcc 100644
--- a/url_filter/backends/plain.py
+++ b/url_filter/backends/plain.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import re
 
 from ..utils import dictify
diff --git a/url_filter/backends/sqlalchemy.py b/url_filter/backends/sqlalchemy.py
index 9c88015..28d7015 100644
--- a/url_filter/backends/sqlalchemy.py
+++ b/url_filter/backends/sqlalchemy.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import itertools
 
 from sqlalchemy import false, func
diff --git a/url_filter/constants.py b/url_filter/constants.py
index 6f820c4..b4c651b 100644
--- a/url_filter/constants.py
+++ b/url_filter/constants.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import enum
 
 
diff --git a/url_filter/exceptions.py b/url_filter/exceptions.py
index 52c72a6..cb07850 100644
--- a/url_filter/exceptions.py
+++ b/url_filter/exceptions.py
@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
-
 class SkipFilter(Exception):
     """
     Exception to be used when any particular filter
diff --git a/url_filter/fields.py b/url_filter/fields.py
index 04f6d37..36d52a6 100644
--- a/url_filter/fields.py
+++ b/url_filter/fields.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from django import forms
 
 from .validators import MaxLengthValidator, MinLengthValidator
diff --git a/url_filter/filters.py b/url_filter/filters.py
index 8b826df..a44dd57 100644
--- a/url_filter/filters.py
+++ b/url_filter/filters.py
@@ -1,10 +1,7 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import abc
 import re
 from functools import wraps
 
-import six
 from cached_property import cached_property
 from django import forms
 from django.core.exceptions import ValidationError
@@ -40,7 +37,7 @@
 )
 
 
-class BaseFilter(six.with_metaclass(abc.ABCMeta, object)):
+class BaseFilter(metaclass=abc.ABCMeta):
     """
     Base class to be used for defining both filters and filtersets.
 
@@ -75,9 +72,7 @@ def __init__(self, source=None, *args, **kwargs):
         self.is_bound = False
 
     def __repr__(self):
-        data = self.repr()
-        data = data if six.PY3 else data.encode("utf-8")
-        return data
+        return self.repr()
 
     @abc.abstractmethod
     def repr(self, prefix=""):
diff --git a/url_filter/filtersets/__init__.py b/url_filter/filtersets/__init__.py
index 2a81d10..9b8851e 100644
--- a/url_filter/filtersets/__init__.py
+++ b/url_filter/filtersets/__init__.py
@@ -1,5 +1,2 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from .base import *  # noqa
 from .django import *  # noqa
diff --git a/url_filter/filtersets/base.py b/url_filter/filtersets/base.py
index d9ca0e5..7ed5579 100644
--- a/url_filter/filtersets/base.py
+++ b/url_filter/filtersets/base.py
@@ -1,11 +1,9 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import abc
+import functools
 import re
 from collections import defaultdict
 from copy import deepcopy
 
-import six
 from cached_property import cached_property
 from django.core.exceptions import ValidationError
 from django.core.validators import RegexValidator
@@ -90,7 +88,7 @@ def __new__(cls, name, bases, attrs):
         return new_class
 
 
-class FilterSet(six.with_metaclass(FilterSetMeta, BaseFilter)):
+class FilterSet(BaseFilter, metaclass=FilterSetMeta):
     """
     Main user-facing classes to use filtersets.
 
@@ -397,7 +395,7 @@ def _generate_lookup_configs(self):
             for value in values:
                 yield LookupConfig(
                     key,
-                    six.moves.reduce(
+                    functools.reduce(
                         lambda a, b: {b: a},
                         (key.replace("!", "").split(LOOKUP_SEP) + [value])[::-1],
                     ),
diff --git a/url_filter/filtersets/django.py b/url_filter/filtersets/django.py
index 7eb31b0..776f06b 100644
--- a/url_filter/filtersets/django.py
+++ b/url_filter/filtersets/django.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import operator
 
 from django import forms
diff --git a/url_filter/filtersets/plain.py b/url_filter/filtersets/plain.py
index 8e5e85d..c2ce2de 100644
--- a/url_filter/filtersets/plain.py
+++ b/url_filter/filtersets/plain.py
@@ -1,9 +1,6 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 from datetime import date, datetime, time
 from decimal import Decimal
 
-import six
 from django import forms
 
 from ..backends.plain import PlainFilterBackend
@@ -15,8 +12,8 @@
 
 DATA_TYPES_MAPPING = SubClassDict(
     {
-        six.string_types: forms.CharField(),
-        six.integer_types: forms.IntegerField(),
+        str: forms.CharField(),
+        int: forms.IntegerField(),
         bool: forms.BooleanField(required=False),
         float: forms.FloatField(),
         Decimal: forms.DecimalField(),
diff --git a/url_filter/filtersets/sqlalchemy.py b/url_filter/filtersets/sqlalchemy.py
index 8ca6a79..bfefcfe 100644
--- a/url_filter/filtersets/sqlalchemy.py
+++ b/url_filter/filtersets/sqlalchemy.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import inspect
 from functools import partial
 
diff --git a/url_filter/integrations/drf.py b/url_filter/integrations/drf.py
index d5e2705..7d578c1 100644
--- a/url_filter/integrations/drf.py
+++ b/url_filter/integrations/drf.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from django.core.exceptions import ValidationError as DjangoValidationError
 from rest_framework.exceptions import ValidationError
 from rest_framework.filters import BaseFilterBackend
diff --git a/url_filter/integrations/drf_coreapi.py b/url_filter/integrations/drf_coreapi.py
index 3309047..3881f60 100644
--- a/url_filter/integrations/drf_coreapi.py
+++ b/url_filter/integrations/drf_coreapi.py
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 import coreapi
 import coreschema
 from django import forms
diff --git a/url_filter/utils.py b/url_filter/utils.py
index 4cbd764..914864d 100644
--- a/url_filter/utils.py
+++ b/url_filter/utils.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
 import inspect
 from contextlib import contextmanager
 
diff --git a/url_filter/validators.py b/url_filter/validators.py
index d40d0ca..0c6536f 100644
--- a/url_filter/validators.py
+++ b/url_filter/validators.py
@@ -1,12 +1,9 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
 from django.core.validators import (
     MaxLengthValidator as _MaxLengthValidator,
     MinLengthValidator as _MinLengthValidator,
 )
 from django.utils.deconstruct import deconstructible
-from django.utils.translation import ungettext_lazy
+from django.utils.translation import ngettext_lazy
 
 
 @deconstructible
@@ -16,7 +13,7 @@ class MinLengthValidator(_MinLengthValidator):
     """
 
     code = "min_length"
-    message = ungettext_lazy(
+    message = ngettext_lazy(
         "Ensure this value has at least %(limit_value)d items (it has %(show_value)d).",
         "Ensure this value has at least %(limit_value)d items (it has %(show_value)d).",
         "limit_value",
@@ -36,7 +33,7 @@ class MaxLengthValidator(_MaxLengthValidator):
     """
 
     code = "max_length"
-    message = ungettext_lazy(
+    message = ngettext_lazy(
         "Ensure this value has at most %(limit_value)d items (it has %(show_value)d).",
         "Ensure this value has at most %(limit_value)d items (it has %(show_value)d).",
         "limit_value",