diff --git a/categories/registration.py b/categories/registration.py
index a4d6eb1..e26bb12 100644
--- a/categories/registration.py
+++ b/categories/registration.py
@@ -1,7 +1,8 @@
 """
 These functions handle the adding of fields to other models
 """
-from django.db.models import FieldDoesNotExist, ForeignKey, ManyToManyField, CASCADE
+from django.db.models import ForeignKey, ManyToManyField, CASCADE
+from django.core.exceptions import FieldDoesNotExist
 from . import fields
 # from settings import self._field_registry, self._model_registry
 from django.utils.translation import ugettext_lazy as _
diff --git a/requirements.txt b/requirements.txt
index c8f4509..0d767c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-django-mptt>=0.9.0,<0.11
+django-mptt==0.11.0
 unicode-slugify==0.1.3