diff --git a/.travis.yml b/.travis.yml
index 405fd7a..d683602 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,36 +15,30 @@ addons:
             - python3.8-dev
             - python3.8-venv
 env:
-    - TOXENV=py27-1.8
-    - TOXENV=py27-1.9
-    - TOXENV=py27-1.10
-    - TOXENV=py35-1.9
-    - TOXENV=py35-1.10
     - TOXENV=py35-1.11
     - TOXENV=py35-2.0
     - TOXENV=py35-2.1
     - TOXENV=py35-2.2
-    - TOXENV=py36-1.9
-    - TOXENV=py36-1.10
     - TOXENV=py36-1.11
     - TOXENV=py36-2.0
     - TOXENV=py36-2.1
     - TOXENV=py36-2.2
     - TOXENV=py36-3.0
-    - TOXENV=py37-1.9
-    - TOXENV=py37-1.10
+    - TOXENV=py36-djdev
     - TOXENV=py37-1.11
     - TOXENV=py37-2.0
     - TOXENV=py37-2.1
     - TOXENV=py37-2.2
     - TOXENV=py37-3.0
+    - TOXENV=py37-djdev
     - TOXENV=py38-2.2
     - TOXENV=py38-3.0
+    - TOXENV=py38-djdev
 matrix:
     allow_failures:
-      - env: TOXENV=py36-3.0
-      - env: TOXENV=py37-3.0
-      - env: TOXENV=py38-3.0
+        - env: TOXENV=py36-djdev
+        - env: TOXENV=py37-djdev
+        - env: TOXENV=py38-djdev
 install:
     - pip install tox
 script:
diff --git a/README.rst b/README.rst
index 3d58ed1..2115abe 100644
--- a/README.rst
+++ b/README.rst
@@ -57,6 +57,8 @@ To use ``django-markitup`` in your Django project:
 Dependencies
 ------------
 
+``django-markitup`` 4.x requires `Django`_ 1.11 or later and Python 3.5+.
+
 ``django-markitup`` 3.x requires `Django`_ 1.8 or later and Python 2.7+ or 3.4+.
 
 ``django-markitup`` 2.x requires `Django`_ 1.4 or later and Python 2.6+ or 3.3+.
diff --git a/markitup/fields.py b/markitup/fields.py
index 3a22c61..607efd6 100644
--- a/markitup/fields.py
+++ b/markitup/fields.py
@@ -1,20 +1,17 @@
-from __future__ import unicode_literals
+from functools import partial
 
 from django.conf import settings
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
 from django.utils.safestring import mark_safe, SafeData
-from django.utils.functional import curry
 from django.core.exceptions import ImproperlyConfigured
 from markitup import widgets
 
 _rendered_field_name = lambda name: '_%s_rendered' % name
 
 def _get_render_func(dotted_path, **kwargs):
-    # Don't coerce to unicode on python 2
-    (module, func) = dotted_path.rsplit(str('.'), 1)
+    module, func = dotted_path.rsplit('.', 1)
     func = getattr(__import__(module, {}, {}, [func]), func)
-    return curry(func, **kwargs)
+    return partial(func, **kwargs)
 
 try:
     render_func = _get_render_func(settings.MARKITUP_FILTER[0],
@@ -25,7 +22,6 @@ def _get_render_func(dotted_path, **kwargs):
 except AttributeError as e:
     raise ImproperlyConfigured("MARKITUP_FILTER setting is required")
 
-@python_2_unicode_compatible
 class Markup(SafeData):
     def __init__(self, instance, field_name, rendered_field_name):
         # instead of storing actual values store a reference to the instance
diff --git a/setup.py b/setup.py
index ccd60d8..6ed0cea 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ def _static_files(prefix):
 
 setup(
     name='django-markitup',
-    version='3.7.0',
+    version='4.0.0',
     description='Markup handling for Django using the MarkItUp! universal markup editor',
     long_description=long_description,
     author='Carl Meyer',
@@ -31,7 +31,6 @@ def _static_files(prefix):
         'License :: OSI Approved :: BSD License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
@@ -41,7 +40,7 @@ def _static_files(prefix):
     ],
     zip_safe=False,
     test_suite='runtests.runtests',
-    tests_require='Django>=1.8',
+    tests_require='Django>=1.11',
     package_data={'markitup': ['templates/markitup/*.html'] +
                               _static_files('static')}
 )
diff --git a/tests/models.py b/tests/models.py
index a8d2460..afa92ec 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -1,12 +1,8 @@
-from __future__ import unicode_literals
-
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible
 
 from markitup.fields import MarkupField
 
 
-@python_2_unicode_compatible
 class Post(models.Model):
     title = models.CharField(max_length=50)
     body = MarkupField()
diff --git a/tox.ini b/tox.ini
index bc6a91e..774095d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,31 +1,30 @@
 [tox]
 envlist=
-  py27-1.{8,9,10}
-  py35-1.{9,10,11}
+  py35-1.11
   py35-2.{0,1,2}
-  py36-1.{9,10,11}
+  py36-1.11
   py36-2.{0,1,2}
   py36-3.0
-  py37-1.{9,10,11}
+  py36-djdev
+  py37-1.11
   py37-2.{0,1,2}
   py37-3.0
+  py37-djdev
   py38-2.2
   py38-3.0
+  py38-djdev
 
 [testenv]
 basepython =
-  py27: python2.7
   py35: python3.5
   py36: python3.6
   py37: python3.7
   py38: python3.8
 commands=python setup.py test
 deps =
-  1.8: Django>=1.8,<1.9
-  1.9: Django>=1.9,<1.10
-  1.10: Django>=1.10,<1.11
   1.11: Django>=1.11,<2
   2.0: Django>=2.0,<2.1
   2.1: Django>=2.1,<2.2
   2.2: Django>=2.2,<3
   3.0: Django>=3.0,<3.1
+  djdev: https://github.com/django/django/archive/master.tar.gz