diff --git a/CHANGES b/CHANGES
index 541969e..ff18e20 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,6 @@
 master
 ------
 
-* Upgrade to Django 1.11
 * Allow user filter for LDAP to be configured
   - Set the AUTH_LDAP_USER_FILTER setting to change it (defaults to "(uid=%(user)s)")
 * Update cabot-alert-hipchat plugin to 2.0.2
diff --git a/Pipfile b/Pipfile
index ff32bed..9820cda 100644
--- a/Pipfile
+++ b/Pipfile
@@ -23,7 +23,7 @@ requests = "*"
 twilio = ">=5,<6"
 whitenoise = "*"
 coreapi = "*"
-Django = ">=1.11,<2"
+Django = ">=1.10,<1.11"
 django_polymorphic = "*"
 django_compressor = "*"
 Markdown = "*"
diff --git a/cabot/cabotapp/tests/tests_basic.py b/cabot/cabotapp/tests/tests_basic.py
index a49ef4a..c83a7da 100644
--- a/cabot/cabotapp/tests/tests_basic.py
+++ b/cabot/cabotapp/tests/tests_basic.py
@@ -8,7 +8,7 @@ from datetime import timedelta, date
 import os
 import requests
 from cabot.cabotapp.graphite import parse_metric
-from cabot.cabotapp.alert import update_alert_plugins
+from cabot.cabotapp.alert import update_alert_plugins, AlertPlugin
 from cabot.cabotapp.models import (
     GraphiteStatusCheck, JenkinsStatusCheck,
     HttpStatusCheck, ICMPStatusCheck, Service, Instance,
@@ -197,6 +197,13 @@ def throws_timeout(*args, **kwargs):
     raise requests.RequestException(u'фиктивная ошибка innit')
 
 
+class TestPolymorphic(LocalTestCase):
+    def test_polymorphic(self):
+        plugin = AlertPlugin.objects.first()
+
+        self.assertIn(type(plugin), AlertPlugin.__subclasses__())
+
+
 class TestCheckRun(LocalTestCase):
 
     def test_calculate_service_status(self):
diff --git a/requirements.txt b/requirements.txt
index b35701f..001160c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ celery==4.0.2
 coreapi==2.3.0
 coreschema==0.0.4
 dj-database-url==0.4.2
-Django==1.11
+Django==1.10.7
 django-appconf==1.0.2
 django-auth-ldap==1.2.10
 django-compressor==2.1.1