diff --git a/tox.ini b/tox.ini
index 9c63221..4190535 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,7 @@
 
 [tox]
-envlist = django18, django19, django110, django111
+envlist = django111
+# envlist = django18, django19, django110, django111
 
 [testenv]
 commands = python manage.py test
@@ -13,6 +14,7 @@ deps =
     coverage
     django-coverage
     django-filer
+    django-polymorphic==1.3
 
 [testenv:django18]
 deps =
@@ -32,4 +34,4 @@ deps =
 [testenv:django111]
 deps =
     django>=1.11, <2.0
-    {[base]deps}
\ No newline at end of file
+    {[base]deps}