diff --git a/.travis.yml b/.travis.yml
index 5b96c1e..73ddc91 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,30 +7,21 @@ matrix:
       env: TOXENV=docs
     - python: "2.7"
       env: TOXENV=flake8
-    - python: "2.7"
-      env: TOXENV=py27-1.8
-    - python: "3.5"
-      env: TOXENV=py35-1.8
-    - python: "2.7"
-      env: TOXENV=py27-1.9
-    - python: "3.5"
-      env: TOXENV=py35-1.9
-    - python: "2.7"
-      env: TOXENV=py27-1.10
-    - python: "3.5"
-      env: TOXENV=py35-1.10
     - python: "2.7"
       env: TOXENV=py27-1.11
+    - python: "3.4"
+      env: TOXENV=py34-1.11
+    - python: "3.5"
+      env: TOXENV=py35-2.1
     - python: "3.6"
-      env: TOXENV=py36-1.11
-    - python: "3.6"
-      env: TOXENV=py36-2.0
-    - python: "3.6"
-      env: TOXENV=py36-master
+      env: TOXENV=py36-2.2
+      dist: xenial  # For SQLite 3.8.3 or later
+    - python: "3.7"
+      env: TOXENV=py37-master
+      dist: xenial  # For Python 3.7
   allow_failures:
-    - env: TOXENV=py36-master
+    - env: TOXENV=py37-master
 install:
-  - pip install coveralls tox
+  - pip install tox
 script:
   - tox
-after_success: coveralls
diff --git a/Makefile b/Makefile
index 0a479db..b69aecd 100644
--- a/Makefile
+++ b/Makefile
@@ -70,4 +70,4 @@ test-release: clean sdist
 	twine upload --repository test dist/*
 	python -m webbrowser -n https://testpypi.python.org/pypi/django-tidings
 
-.PHONY: help clean coverage coveragehtml develop lint qa qa-all release sdist test test-all test-release
+.PHONY: help clean coverage coveragehtml develop docs lint qa qa-all release sdist test test-all test-release
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4448ab6..8726cec 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 -r ../tests/requirements.txt
 
-Sphinx==1.6.7
-sphinx-rtd-theme==0.2.4
-Django<2.1
+Sphinx==1.8.5
+sphinx-rtd-theme==0.4.3
+Django<2.2
diff --git a/requirements.dev.txt b/requirements.dev.txt
index 48df92f..6c9c951 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,6 +1,6 @@
 # Testing and development requirements
 -r tests/requirements.txt
-Django<2.1
+Django<2.2
 check-manifest
 coverage
 flake8
diff --git a/setup.py b/setup.py
index 6bf0875..4b47cdb 100644
--- a/setup.py
+++ b/setup.py
@@ -49,11 +49,10 @@ def long_description():
     classifiers=[
         'Environment :: Web Environment',
         'Framework :: Django',
-        'Framework :: Django :: 1.8',
-        'Framework :: Django :: 1.9',
-        'Framework :: Django :: 1.10',
         'Framework :: Django :: 1.11',
         'Framework :: Django :: 2.0',
+        'Framework :: Django :: 2.1',
+        'Framework :: Django :: 2.2',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: BSD License',
         'Natural Language :: English',
@@ -65,6 +64,7 @@ def long_description():
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Topic :: Communications :: Email',
         'Topic :: Software Development :: Libraries :: Python Modules'],
 )
diff --git a/tests/base.py b/tests/base.py
index c7cbcf8..d95282b 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -2,8 +2,8 @@
 from string import ascii_letters
 
 from django.contrib.auth import get_user_model
-from django.utils.six.moves import range
 
+from tidings.compat import range
 from tidings.models import Watch, WatchFilter
 
 
diff --git a/tests/test_events.py b/tests/test_events.py
index e5a8cce..e063d27 100644
--- a/tests/test_events.py
+++ b/tests/test_events.py
@@ -4,8 +4,8 @@
 from django.core import mail
 from django.core.mail import EmailMessage
 from django.test import TestCase, override_settings
-from django.utils.six.moves import range
 
+from tidings.compat import range
 from tidings.events import Event, _unique_by_email, EventUnion, InstanceEvent
 from tidings.models import Watch, EmailUser
 
@@ -42,6 +42,16 @@ class FilteredContentTypeEvent(ContentTypeEvent):
     filters = set(['color', 'flavor'])
 
 
+fire_simple_event_called = False
+
+
+class FireSimpleEvent(SimpleEvent):
+    def _mails(self, users_and_watches):
+        global fire_simple_event_called
+        fire_simple_event_called = True
+        return []
+
+
 class UsersWatchingTests(TestCase):
     """Unit tests for Event._users_watching_by_filter()"""
 
@@ -262,19 +272,13 @@ def _users_watching(self):
 
     def test_fire(self):
         """Assert firing the union gets the mails from the first event."""
-
-        class FireSimpleEvent(SimpleEvent):
-            called = False
-
-            def _mails(self, users_and_watches):
-                self.called = True
-                return []
-
+        global fire_simple_event_called
         watch(event_type=TYPE, email='he@llo.com').save()
         simple_event = FireSimpleEvent()
+        fire_simple_event_called = False
         another_event = AnotherEvent()
         EventUnion(simple_event, another_event).fire()
-        self.assertTrue(simple_event.called)
+        self.assertTrue(fire_simple_event_called)
 
     def test_watch_lists(self):
         """Ensure the Union returns every watch a user has."""
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 5d7b075..3304a8b 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,7 +1,7 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.test import override_settings, TestCase
-from django.utils.six.moves import range, reduce
 
+from tidings.compat import range, reduce
 from tidings.utils import collate, import_from_setting
 
 
diff --git a/tidings/compat.py b/tidings/compat.py
index 3d23679..a65033a 100644
--- a/tidings/compat.py
+++ b/tidings/compat.py
@@ -1,21 +1,28 @@
 """Compatibility functions for tidings."""
 
-# The standard Django reverse function
-# This is the default value if TIDINGS_REVERSE is not set
+# Python 2/3 compatibility for Django 1.11
 try:
-    # Django 1.10 and later
-    from django.urls import reverse
+    # Django 2.2 and earlier include six, but it is only
+    # needed for Python 2.7 under Django 1.11.
+    from django.utils.six import (iteritems, iterkeys, string_types, next,
+                                  text_type)
+    from django.utils.six.moves import range, reduce
 except ImportError:
-    # Django 1.9 and earlier
-    from django.core.urlresolvers import reverse
-assert reverse
+    # Django 3.0 drops the six library, but only runs under Python 3
+    # Copy Python 3 variants from https://github.com/benjaminp/six
 
+    from functools import reduce
+    assert reduce  # Make flake8 happier
 
-def is_authenticated(user):
-    """Is a user instance authenticated?"""
-    if callable(user.is_authenticated):
-        # Django 1.9 and earlier
-        return user.is_authenticated()
-    else:
-        # Django 1.10 and later
-        return user.is_authenticated
+    def iteritems(d, **kw):
+        return iter(d.items(**kw))
+
+    def iterkeys(d, **kw):
+        return iter(d.keys(**kw))
+
+    string_types = str,
+    text_type = str
+
+    # Asign built-ins to importable variables
+    next = next
+    range = range
diff --git a/tidings/events.py b/tidings/events.py
index fcbfa71..5609847 100644
--- a/tidings/events.py
+++ b/tidings/events.py
@@ -7,12 +7,10 @@
 from django.contrib.contenttypes.models import ContentType
 from django.core import mail
 from django.db.models import Q
-from django.utils.six import iteritems, iterkeys, string_types
-from django.utils.six.moves import range
 
 from celery.task import task
 
-from .compat import is_authenticated
+from .compat import iteritems, iterkeys, string_types, range
 from .models import Watch, WatchFilter, EmailUser, multi_raw
 from .utils import collate, hash_to_unsigned
 
@@ -70,8 +68,8 @@ def ensure_user_has_email(user, cluster_email):
                        watches)
             favorite_user, watches = u, []
             cluster_email = row_email
-        elif ((not favorite_user.email or not is_authenticated(u)) and
-              u.email and is_authenticated(u)):
+        elif ((not favorite_user.email or not u.is_authenticated) and
+              u.email and u.is_authenticated):
             favorite_user = u
         watches.extend(w)
     if favorite_user is not None:
@@ -310,7 +308,7 @@ def _watches_belonging_to_user(cls, user_or_email, object_id=None,
 
         if isinstance(user_or_email, string_types):
             user_condition = Q(email=user_or_email)
-        elif is_authenticated(user_or_email):
+        elif user_or_email.is_authenticated:
             user_condition = Q(user=user_or_email)
         else:
             return Watch.objects.none()
diff --git a/tidings/models.py b/tidings/models.py
index 4326a24..2ce2809 100644
--- a/tidings/models.py
+++ b/tidings/models.py
@@ -5,8 +5,8 @@
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.sites.models import Site
 from django.db import models, connections, router
-from django.utils.six import next, text_type
 
+from .compat import next, text_type
 from .utils import import_from_setting, reverse
 
 
@@ -130,9 +130,7 @@ class EmailUser(AnonymousUser):
     """An anonymous user identified only by email address.
 
     This is based on Django's AnonymousUser, so you can use the
-    ``is_authenticated`` property (Django 1.10 or later) or
-    ``is_authenticated`` method (Django 1.9 or earlier) to tell that
-    this is an anonymous user.
+    ``is_authenticated`` property to tell that this is an anonymous user.
     """
     def __init__(self, email=''):
         self.email = email
diff --git a/tidings/utils.py b/tidings/utils.py
index e3f200a..ba17325 100644
--- a/tidings/utils.py
+++ b/tidings/utils.py
@@ -4,10 +4,10 @@
 from django.core.exceptions import ImproperlyConfigured
 from django.core.mail import EmailMessage
 from django.template import Context, loader
+from django.urls import reverse as django_reverse
 from django.utils.module_loading import import_string
-from django.utils.six import next, string_types
 
-from .compat import reverse as django_reverse
+from .compat import next, string_types
 
 
 def collate(*iterables, **kwargs):
diff --git a/tox.ini b/tox.ini
index e0638ae..7196964 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,28 +4,30 @@ skip_missing_interpreters = true
 envlist =
     docs,
     flake8,
-    py{27,34,35}-1.8
-    py{27,34,35,36}-{1.9,1.10,1.11}
-    py{35,36}-{2.0,master}
+    py{27,34,35,36}-1.11
+    py{35,36,37}-{2.0,2.1,2.2,master}
 
 [testenv]
+passenv = TRAVIS TRAVIS_*
 basepython =
     py27: python2.7
     py34: python3.4
     py35: python3.5
     py36: python3.6
+    py37: python3.7
 usedevelop = true
 pip_pre = true
-commands = make coverage
+commands =
+    make coverage
+    coveralls
 deps =
-    coverage
-    1.8: Django>=1.8,<1.9
-    1.9: Django>=1.9,<1.10
-    1.10: Django>=1.10,<1.11
+    coveralls
     1.11: Django>=1.11,<2.0
     2.0: Django>=2.0,<2.1
+    2.1: Django>=2.1,<2.2
+    2.2: Django>=2.2a1,<2.3
     master: https://github.com/django/django/archive/master.tar.gz
-    {1.8,1.9,1.10,1.11,2.0}: -r{toxinidir}/tests/requirements.txt
+    {1.11,2.0,2.1,2.2}: -r{toxinidir}/tests/requirements.txt
     master: -r{toxinidir}/tests/requirements-latest.txt
 whitelist_externals = make
 
@@ -38,5 +40,5 @@ commands = make docs
 basepython = python2.7
 deps =
     flake8
-    Django<1.9
+    Django<2.2
 commands = make lint