diff --git a/.travis.yml b/.travis.yml
index 87db5e0465..4a7fdd42f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,23 +18,16 @@ env:
     - TOX_ENV=py32-django16
     - TOX_ENV=py27-django16
     - TOX_ENV=py26-django16
-    - TOX_ENV=py34-django15
-    - TOX_ENV=py33-django15
-    - TOX_ENV=py32-django15
-    - TOX_ENV=py27-django15
-    - TOX_ENV=py26-django15
     - TOX_ENV=py27-djangomaster
-    - TOX_ENV=py32-djangomaster
-    - TOX_ENV=py33-djangomaster
     - TOX_ENV=py34-djangomaster
+    - TOX_ENV=py35-djangomaster
 
 matrix:
   fast_finish: true
   allow_failures:
     - env: TOX_ENV=py27-djangomaster
-    - env: TOX_ENV=py32-djangomaster
-    - env: TOX_ENV=py33-djangomaster
     - env: TOX_ENV=py34-djangomaster
+    - env: TOX_ENV=py35-djangomaster
 
 install:
   - pip install tox
diff --git a/README.md b/README.md
index b183e14df0..c2a686f4ce 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ There is a live example API for testing purposes, [available here][sandbox].
 # Requirements
 
 * Python (2.6.5+, 2.7, 3.2, 3.3, 3.4)
-* Django (1.5.6+, 1.6.3+, 1.7, 1.8)
+* Django (1.6.3+, 1.7, 1.8)
 
 # Installation
 
diff --git a/docs/api-guide/serializers.md b/docs/api-guide/serializers.md
index ca540a13b5..63189b9663 100644
--- a/docs/api-guide/serializers.md
+++ b/docs/api-guide/serializers.md
@@ -438,6 +438,7 @@ Declaring a `ModelSerializer` looks like this:
     class AccountSerializer(serializers.ModelSerializer):
         class Meta:
             model = Account
+            fields = ('id', 'account_name', 'users', 'created')
 
 By default, all the model fields on the class will be mapped to a corresponding serializer fields.
 
@@ -459,7 +460,7 @@ To do so, open the Django shell, using `python manage.py shell`, then import the
 
 ## Specifying which fields to include
 
-If you only want a subset of the default fields to be used in a model serializer, you can do so using `fields` or `exclude` options, just as you would with a `ModelForm`.
+If you only want a subset of the default fields to be used in a model serializer, you can do so using `fields` or `exclude` options, just as you would with a `ModelForm`. It is strongly recommended that you explicitly set all fields that should be serialized using the `fields` attribute. This will make it less likely to result in unintentionally exposing data when your models change.
 
 For example:
 
@@ -468,7 +469,27 @@ For example:
             model = Account
             fields = ('id', 'account_name', 'users', 'created')
 
-The names in the `fields` option will normally map to model fields on the model class.
+You can also set the `fields` attribute to the special value `'__all__'` to indicate that all fields in the model should be used.
+
+For example:
+
+    class AccountSerializer(serializers.ModelSerializer):
+        class Meta:
+            model = Account
+            fields = '__all__'
+
+You can set the `exclude` attribute of the to a list of fields to be excluded from the serializer.
+
+For example:
+
+    class AccountSerializer(serializers.ModelSerializer):
+        class Meta:
+            model = Account
+            exclude = ('users',)
+
+In the example above, if the `Account` model had 3 fields `account_name`, `users`, and `created`, this will result in the fields `account_name` and `created` to be serialized.
+
+The names in the `fields` and `exclude` attributes will normally map to model fields on the model class.
 
 Alternatively names in the `fields` options can map to properties or methods which take no arguments that exist on the model class.
 
diff --git a/docs/topics/release-notes.md b/docs/topics/release-notes.md
index 260dc476c3..93778f74dd 100644
--- a/docs/topics/release-notes.md
+++ b/docs/topics/release-notes.md
@@ -38,6 +38,14 @@ You can determine your currently installed version using `pip freeze`:
 
 ---
 
+## 3.3.x series
+
+### 3.3.0
+
+**Date**: NOT YET RELEASED
+
+* Removed support for Django Version 1.5 ([#3421][gh3421])
+
 ## 3.2.x series
 
 ### 3.2.4
@@ -533,3 +541,6 @@ For older release notes, [please see the version 2.x documentation][old-release-
 [gh3361]: https://github.com/tomchristie/django-rest-framework/issues/3361
 [gh3364]: https://github.com/tomchristie/django-rest-framework/issues/3364
 [gh3415]: https://github.com/tomchristie/django-rest-framework/issues/3415
+
+<!-- 3.3.0 -->
+[gh3421]: https://github.com/tomchristie/django-rest-framework/pulls/3421
diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 460795f658..fcca2dcbf8 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -67,6 +67,14 @@ def distinct(queryset, base):
     from django.utils.datastructures import SortedDict as OrderedDict
 
 
+# unittest.SkipUnless only available in Python 2.7.
+try:
+    import unittest
+    unittest.skipUnless
+except (ImportError, AttributeError):
+    from django.utils import unittest
+
+
 # contrib.postgres only supported from 1.8 onwards.
 try:
     from django.contrib.postgres import fields as postgres_fields
@@ -74,23 +82,30 @@ def distinct(queryset, base):
     postgres_fields = None
 
 
+# Apps only exists from 1.7 onwards.
+try:
+    from django.apps import apps
+    get_model = apps.get_model
+except ImportError:
+    from django.db.models import get_model
+
+
+# Import path changes from 1.7 onwards.
+try:
+    from django.contrib.contenttypes.fields import (
+        GenericForeignKey, GenericRelation
+    )
+except ImportError:
+    from django.contrib.contenttypes.generic import (
+        GenericForeignKey, GenericRelation
+    )
+
 # django-filter is optional
 try:
     import django_filters
 except ImportError:
     django_filters = None
 
-if django.VERSION >= (1, 6):
-    def clean_manytomany_helptext(text):
-        return text
-else:
-    # Up to version 1.5 many to many fields automatically suffix
-    # the `help_text` attribute with hardcoded text.
-    def clean_manytomany_helptext(text):
-        if text.endswith(' Hold down "Control", or "Command" on a Mac, to select more than one.'):
-            text = text[:-69]
-        return text
-
 # Django-guardian is optional. Import only if guardian is in INSTALLED_APPS
 # Fixes (#1712). We keep the try/except for the test suite.
 guardian = None
@@ -101,14 +116,6 @@ def clean_manytomany_helptext(text):
     pass
 
 
-def get_model_name(model_cls):
-    try:
-        return model_cls._meta.model_name
-    except AttributeError:
-        # < 1.6 used module_name instead of model_name
-        return model_cls._meta.module_name
-
-
 # MinValueValidator, MaxValueValidator et al. only accept `message` in 1.8+
 if django.VERSION >= (1, 8):
     from django.core.validators import MinValueValidator, MaxValueValidator
@@ -144,32 +151,6 @@ def __init__(self, *args, **kwargs):
             super(MaxLengthValidator, self).__init__(*args, **kwargs)
 
 
-# URLValidator only accepts `message` in 1.6+
-if django.VERSION >= (1, 6):
-    from django.core.validators import URLValidator
-else:
-    from django.core.validators import URLValidator as DjangoURLValidator
-
-
-    class URLValidator(DjangoURLValidator):
-        def __init__(self, *args, **kwargs):
-            self.message = kwargs.pop('message', self.message)
-            super(URLValidator, self).__init__(*args, **kwargs)
-
-
-# EmailValidator requires explicit regex prior to 1.6+
-if django.VERSION >= (1, 6):
-    from django.core.validators import EmailValidator
-else:
-    from django.core.validators import EmailValidator as DjangoEmailValidator
-    from django.core.validators import email_re
-
-
-    class EmailValidator(DjangoEmailValidator):
-        def __init__(self, *args, **kwargs):
-            super(EmailValidator, self).__init__(email_re, *args, **kwargs)
-
-
 # PATCH method is not implemented by Django
 if 'patch' not in View.http_method_names:
     View.http_method_names = View.http_method_names + ['patch']
diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 86e86f86ef..09284dd554 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -11,7 +11,9 @@
 from django.conf import settings
 from django.core.exceptions import ValidationError as DjangoValidationError
 from django.core.exceptions import ObjectDoesNotExist
-from django.core.validators import RegexValidator, ip_address_validators
+from django.core.validators import (
+    EmailValidator, RegexValidator, URLValidator, ip_address_validators
+)
 from django.forms import FilePathField as DjangoFilePathField
 from django.forms import ImageField as DjangoImageField
 from django.utils import six, timezone
@@ -23,9 +25,9 @@
 
 from rest_framework import ISO_8601
 from rest_framework.compat import (
-    EmailValidator, MaxLengthValidator, MaxValueValidator, MinLengthValidator,
-    MinValueValidator, OrderedDict, URLValidator, duration_string,
-    parse_duration, unicode_repr, unicode_to_repr
+    MaxLengthValidator, MaxValueValidator, MinLengthValidator,
+    MinValueValidator, OrderedDict, duration_string, parse_duration,
+    unicode_repr, unicode_to_repr
 )
 from rest_framework.exceptions import ValidationError
 from rest_framework.settings import api_settings
diff --git a/rest_framework/filters.py b/rest_framework/filters.py
index 90c19aba08..c1e0ae054a 100644
--- a/rest_framework/filters.py
+++ b/rest_framework/filters.py
@@ -11,9 +11,7 @@
 from django.db import models
 from django.utils import six
 
-from rest_framework.compat import (
-    distinct, django_filters, get_model_name, guardian
-)
+from rest_framework.compat import distinct, django_filters, guardian
 from rest_framework.settings import api_settings
 
 FilterSet = django_filters and django_filters.FilterSet or None
@@ -202,7 +200,7 @@ def filter_queryset(self, request, queryset, view):
         model_cls = queryset.model
         kwargs = {
             'app_label': model_cls._meta.app_label,
-            'model_name': get_model_name(model_cls)
+            'model_name': model_cls._meta.model_name
         }
         permission = self.perm_format % kwargs
         if guardian.VERSION >= (1, 3):
diff --git a/rest_framework/permissions.py b/rest_framework/permissions.py
index 628538903a..292952cfab 100644
--- a/rest_framework/permissions.py
+++ b/rest_framework/permissions.py
@@ -5,8 +5,6 @@
 
 from django.http import Http404
 
-from rest_framework.compat import get_model_name
-
 SAFE_METHODS = ('GET', 'HEAD', 'OPTIONS')
 
 
@@ -104,7 +102,7 @@ def get_required_permissions(self, method, model_cls):
         """
         kwargs = {
             'app_label': model_cls._meta.app_label,
-            'model_name': get_model_name(model_cls)
+            'model_name': model_cls._meta.model_name
         }
         return [perm % kwargs for perm in self.perms_map[method]]
 
@@ -166,7 +164,7 @@ class DjangoObjectPermissions(DjangoModelPermissions):
     def get_required_object_permissions(self, method, model_cls):
         kwargs = {
             'app_label': model_cls._meta.app_label,
-            'model_name': get_model_name(model_cls)
+            'model_name': model_cls._meta.model_name
         }
         return [perm % kwargs for perm in self.perms_map[method]]
 
diff --git a/rest_framework/response.py b/rest_framework/response.py
index 3f038e3b5f..0e97668eb4 100644
--- a/rest_framework/response.py
+++ b/rest_framework/response.py
@@ -98,7 +98,7 @@ def __getstate__(self):
         state = super(Response, self).__getstate__()
         for key in (
             'accepted_renderer', 'renderer_context', 'resolver_match',
-            'client', 'request', 'wsgi_request'
+            'client', 'request', 'json', 'wsgi_request'
         ):
             if key in state:
                 del state[key]
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index fc1fe468d1..0b0b1aa623 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -12,6 +12,8 @@
 """
 from __future__ import unicode_literals
 
+import warnings
+
 from django.db import models
 from django.db.models.fields import Field as DjangoModelField
 from django.db.models.fields import FieldDoesNotExist
@@ -51,6 +53,8 @@
     'instance', 'data', 'partial', 'context', 'allow_null'
 )
 
+ALL_FIELDS = '__all__'
+
 
 # BaseSerializer
 # --------------
@@ -957,10 +961,10 @@ def get_field_names(self, declared_fields, info):
         fields = getattr(self.Meta, 'fields', None)
         exclude = getattr(self.Meta, 'exclude', None)
 
-        if fields and not isinstance(fields, (list, tuple)):
+        if fields and fields != ALL_FIELDS and not isinstance(fields, (list, tuple)):
             raise TypeError(
-                'The `fields` option must be a list or tuple. Got %s.' %
-                type(fields).__name__
+                'The `fields` option must be a list or tuple or "__all__". '
+                'Got %s.' % type(fields).__name__
             )
 
         if exclude and not isinstance(exclude, (list, tuple)):
@@ -976,6 +980,20 @@ def get_field_names(self, declared_fields, info):
             )
         )
 
+        if fields is None and exclude is None:
+            warnings.warn(
+                "Creating a ModelSerializer without either the 'fields' "
+                "attribute or the 'exclude' attribute is pending deprecation "
+                "since 3.3.0. Add an explicit fields = '__all__' to the "
+                "{serializer_class} serializer.".format(
+                    serializer_class=self.__class__.__name__
+                ),
+                PendingDeprecationWarning
+            )
+
+        if fields == ALL_FIELDS:
+            fields = None
+
         if fields is not None:
             # Ensure that all declared fields have also been included in the
             # `Meta.fields` option.
diff --git a/rest_framework/templatetags/rest_framework.py b/rest_framework/templatetags/rest_framework.py
index 0069d9a5e2..08acecef77 100644
--- a/rest_framework/templatetags/rest_framework.py
+++ b/rest_framework/templatetags/rest_framework.py
@@ -41,8 +41,9 @@ def optional_login(request):
     except NoReverseMatch:
         return ''
 
-    snippet = "<li><a href='{href}?next={next}'>Log in</a></li>".format(href=login_url, next=escape(request.path))
-    return snippet
+    snippet = "<li><a href='{href}?next={next}'>Log in</a></li>"
+    snippet = snippet.format(href=login_url, next=escape(request.path))
+    return mark_safe(snippet)
 
 
 @register.simple_tag
@@ -64,8 +65,8 @@ def optional_logout(request, user):
             <li><a href='{href}?next={next}'>Log out</a></li>
         </ul>
     </li>"""
-
-    return snippet.format(user=user, href=logout_url, next=escape(request.path))
+    snippet = snippet.format(user=escape(user), href=logout_url, next=escape(request.path))
+    return mark_safe(snippet)
 
 
 @register.simple_tag
diff --git a/rest_framework/utils/field_mapping.py b/rest_framework/utils/field_mapping.py
index 48c584b91f..fef9f5d3df 100644
--- a/rest_framework/utils/field_mapping.py
+++ b/rest_framework/utils/field_mapping.py
@@ -8,7 +8,6 @@
 from django.db import models
 from django.utils.text import capfirst
 
-from rest_framework.compat import clean_manytomany_helptext
 from rest_framework.validators import UniqueValidator
 
 NUMERIC_FIELD_TYPES = (
@@ -230,7 +229,7 @@ def get_relation_kwargs(field_name, relation_info):
     if model_field:
         if model_field.verbose_name and needs_label(model_field, field_name):
             kwargs['label'] = capfirst(model_field.verbose_name)
-        help_text = clean_manytomany_helptext(model_field.help_text)
+        help_text = model_field.help_text
         if help_text:
             kwargs['help_text'] = help_text
         if not model_field.editable:
diff --git a/rest_framework/utils/model_meta.py b/rest_framework/utils/model_meta.py
index 3bcd9049c4..9718647695 100644
--- a/rest_framework/utils/model_meta.py
+++ b/rest_framework/utils/model_meta.py
@@ -12,7 +12,7 @@
 from django.db import models
 from django.utils import six
 
-from rest_framework.compat import OrderedDict
+from rest_framework.compat import OrderedDict, get_model
 
 FieldInfo = namedtuple('FieldResult', [
     'pk',  # Model field instance
@@ -45,7 +45,7 @@ def _resolve_model(obj):
     """
     if isinstance(obj, six.string_types) and len(obj.split('.')) == 2:
         app_name, model_name = obj.split('.')
-        resolved_model = models.get_model(app_name, model_name)
+        resolved_model = get_model(app_name, model_name)
         if resolved_model is None:
             msg = "Django did not return a model for {0}.{1}"
             raise ImproperlyConfigured(msg.format(app_name, model_name))
diff --git a/tests/test_atomic_requests.py b/tests/test_atomic_requests.py
index 9c30c2f8bd..5920caccb6 100644
--- a/tests/test_atomic_requests.py
+++ b/tests/test_atomic_requests.py
@@ -1,13 +1,13 @@
 from __future__ import unicode_literals
 
-from django.conf.urls import patterns, url
+from django.conf.urls import url
 from django.db import connection, connections, transaction
 from django.http import Http404
 from django.test import TestCase, TransactionTestCase
 from django.utils.decorators import method_decorator
-from django.utils.unittest import skipUnless
 
 from rest_framework import status
+from rest_framework.compat import unittest
 from rest_framework.exceptions import APIException
 from rest_framework.response import Response
 from rest_framework.test import APIRequestFactory
@@ -35,8 +35,10 @@ def post(self, request, *args, **kwargs):
         raise APIException
 
 
-@skipUnless(connection.features.uses_savepoints,
-            "'atomic' requires transactions and savepoints.")
+@unittest.skipUnless(
+    connection.features.uses_savepoints,
+    "'atomic' requires transactions and savepoints."
+)
 class DBTransactionTests(TestCase):
     def setUp(self):
         self.view = BasicView.as_view()
@@ -55,8 +57,10 @@ def test_no_exception_commit_transaction(self):
         assert BasicModel.objects.count() == 1
 
 
-@skipUnless(connection.features.uses_savepoints,
-            "'atomic' requires transactions and savepoints.")
+@unittest.skipUnless(
+    connection.features.uses_savepoints,
+    "'atomic' requires transactions and savepoints."
+)
 class DBTransactionErrorTests(TestCase):
     def setUp(self):
         self.view = ErrorView.as_view()
@@ -83,8 +87,10 @@ def test_generic_exception_delegate_transaction_management(self):
         assert BasicModel.objects.count() == 1
 
 
-@skipUnless(connection.features.uses_savepoints,
-            "'atomic' requires transactions and savepoints.")
+@unittest.skipUnless(
+    connection.features.uses_savepoints,
+    "'atomic' requires transactions and savepoints."
+)
 class DBTransactionAPIExceptionTests(TestCase):
     def setUp(self):
         self.view = APIExceptionView.as_view()
@@ -113,8 +119,10 @@ def test_api_exception_rollback_transaction(self):
         assert BasicModel.objects.count() == 0
 
 
-@skipUnless(connection.features.uses_savepoints,
-            "'atomic' requires transactions and savepoints.")
+@unittest.skipUnless(
+    connection.features.uses_savepoints,
+    "'atomic' requires transactions and savepoints."
+)
 class NonAtomicDBTransactionAPIExceptionTests(TransactionTestCase):
     @property
     def urls(self):
@@ -127,9 +135,8 @@ def get(self, request, *args, **kwargs):
                 BasicModel.objects.all()
                 raise Http404
 
-        return patterns(
-            '',
-            url(r'^$', NonAtomicAPIExceptionView.as_view())
+        return (
+            url(r'^$', NonAtomicAPIExceptionView.as_view()),
         )
 
     def setUp(self):
diff --git a/tests/test_filters.py b/tests/test_filters.py
index 0610b08557..bce6e08faf 100644
--- a/tests/test_filters.py
+++ b/tests/test_filters.py
@@ -8,12 +8,11 @@
 from django.db import models
 from django.test import TestCase
 from django.test.utils import override_settings
-from django.utils import unittest
 from django.utils.dateparse import parse_date
 from django.utils.six.moves import reload_module
 
 from rest_framework import filters, generics, serializers, status
-from rest_framework.compat import django_filters
+from rest_framework.compat import django_filters, unittest
 from rest_framework.test import APIRequestFactory
 
 from .models import BaseFilterableItem, BasicModel, FilterableItem
diff --git a/tests/test_model_serializer.py b/tests/test_model_serializer.py
index 777b956c4b..89557fa1dd 100644
--- a/tests/test_model_serializer.py
+++ b/tests/test_model_serializer.py
@@ -321,6 +321,21 @@ class Meta:
 
         ExampleSerializer()
 
+    def test_fields_and_exclude_behavior(self):
+        class ImplicitFieldsSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = RegularFieldsModel
+
+        class ExplicitFieldsSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = RegularFieldsModel
+                fields = '__all__'
+
+        implicit = ImplicitFieldsSerializer()
+        explicit = ExplicitFieldsSerializer()
+
+        assert implicit.data == explicit.data
+
 
 @pytest.mark.skipif(django.VERSION < (1, 8),
                     reason='DurationField is only available for django1.8+')
diff --git a/tests/test_permissions.py b/tests/test_permissions.py
index 3980200020..f0d77e957b 100644
--- a/tests/test_permissions.py
+++ b/tests/test_permissions.py
@@ -6,13 +6,12 @@
 from django.core.urlresolvers import ResolverMatch
 from django.db import models
 from django.test import TestCase
-from django.utils import unittest
 
 from rest_framework import (
     HTTP_HEADER_ENCODING, authentication, generics, permissions, serializers,
     status
 )
-from rest_framework.compat import get_model_name, guardian
+from rest_framework.compat import guardian, unittest
 from rest_framework.filters import DjangoObjectPermissionsFilter
 from rest_framework.routers import DefaultRouter
 from rest_framework.test import APIRequestFactory
@@ -279,7 +278,7 @@ def setUp(self):
 
         # give everyone model level permissions, as we are not testing those
         everyone = Group.objects.create(name='everyone')
-        model_name = get_model_name(BasicPermModel)
+        model_name = BasicPermModel._meta.model_name
         app_label = BasicPermModel._meta.app_label
         f = '{0}_{1}'.format
         perms = {
diff --git a/tests/test_relations_generic.py b/tests/test_relations_generic.py
index 962857365f..5cb2dfc05b 100644
--- a/tests/test_relations_generic.py
+++ b/tests/test_relations_generic.py
@@ -1,14 +1,12 @@
 from __future__ import unicode_literals
 
-from django.contrib.contenttypes.generic import (
-    GenericForeignKey, GenericRelation
-)
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.test import TestCase
 from django.utils.encoding import python_2_unicode_compatible
 
 from rest_framework import serializers
+from rest_framework.compat import GenericForeignKey, GenericRelation
 
 
 @python_2_unicode_compatible
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 062f78e11a..4c9fd03c85 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -150,12 +150,12 @@ class ResolveModelWithPatchedDjangoTests(TestCase):
 
     def setUp(self):
         """Monkeypatch get_model."""
-        self.get_model = rest_framework.utils.model_meta.models.get_model
+        self.get_model = rest_framework.utils.model_meta.get_model
 
         def get_model(app_label, model_name):
             return None
 
-        rest_framework.utils.model_meta.models.get_model = get_model
+        rest_framework.utils.model_meta.get_model = get_model
 
     def tearDown(self):
         """Revert monkeypatching."""
diff --git a/tox.ini b/tox.ini
index ef505248bb..204a68457f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,15 +4,23 @@ addopts=--tb=short
 [tox]
 envlist =
        py27-{lint,docs},
-       {py26,py27,py32,py33,py34}-django{15,16},
-       {py27,py32,py33,py34}-django{17,18,master}
+       {py26,py27,py32,py33,py34}-django16,
+       {py27,py32,py33,py34}-django{17,18},
+       {py27,py34,py35}-django{master}
 
 [testenv]
+basepython =
+            py26: python2.6
+            py27: python2.7
+            py32: python3.2
+            py33: python3.3
+            py34: python3.4
+            py35: python3.5
+
 commands = ./runtests.py --fast {posargs} --coverage
 setenv =
        PYTHONDONTWRITEBYTECODE=1
 deps =
-       django15: Django==1.5.6  # Should track minimum supported
        django16: Django==1.6.3  # Should track minimum supported
        django17: Django==1.7.10  # Should track maximum supported
        django18: Django==1.8.4  # Should track maximum supported
@@ -31,3 +39,25 @@ commands = mkdocs build
 deps =
        -rrequirements/requirements-testing.txt
        -rrequirements/requirements-documentation.txt
+
+# Specify explicitly to exclude Django Guardian against Django master (various Pythons)
+[testenv:py27-djangomaster]
+deps =
+       https://github.com/django/django/archive/master.tar.gz
+       -rrequirements/requirements-testing.txt
+       markdown==2.5.2
+       django-filter==0.10.0
+[testenv:py34-djangomaster]
+deps =
+       https://github.com/django/django/archive/master.tar.gz
+       -rrequirements/requirements-testing.txt
+       markdown==2.5.2
+       django-filter==0.10.0
+
+[testenv:py35-djangomaster]
+deps =
+       https://github.com/django/django/archive/master.tar.gz
+       -rrequirements/requirements-testing.txt
+       markdown==2.5.2
+       django-filter==0.10.0
+