diff --git a/django_postgres_extensions/models/expressions.py b/django_postgres_extensions/models/expressions.py
index d395f80..71e9915 100644
--- a/django_postgres_extensions/models/expressions.py
+++ b/django_postgres_extensions/models/expressions.py
@@ -1,5 +1,5 @@
 from django.db.models.expressions import F as BaseF, Value as BaseValue, Func, Expression
-from django.utils import six
+import six
 from django.contrib.postgres.fields.array import IndexTransform
 from django.utils.functional import cached_property
 from django.db.models.lookups import Transform
diff --git a/django_postgres_extensions/models/fields/related.py b/django_postgres_extensions/models/fields/related.py
index 1ac5b2a..5f623de 100644
--- a/django_postgres_extensions/models/fields/related.py
+++ b/django_postgres_extensions/models/fields/related.py
@@ -6,7 +6,7 @@
 from django.db import models
 from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT, lazy_related_operation
 from django.forms.models import ModelMultipleChoiceField
-from django.utils import six
+import six
 from django.utils.encoding import force_text
 from .related_lookups import RelatedArrayContains, RelatedArrayExact, RelatedArrayContainedBy, RelatedContainsItem, \
     RelatedArrayOverlap, RelatedAnyGreaterThan, RelatedAnyLessThanOrEqual, RelatedAnyLessThan, RelatedAnyGreaterThanOrEqual
@@ -353,4 +353,4 @@ def get_lookup(self, lookup_name):
         elif lookup_name == 'lte':
             return RelatedAnyLessThanOrEqual
         else:
-            raise TypeError('Related Array got invalid lookup: %s' % lookup_name)
\ No newline at end of file
+            raise TypeError('Related Array got invalid lookup: %s' % lookup_name)
diff --git a/django_postgres_extensions/models/functions.py b/django_postgres_extensions/models/functions.py
index c7ed502..c3e489c 100644
--- a/django_postgres_extensions/models/functions.py
+++ b/django_postgres_extensions/models/functions.py
@@ -1,6 +1,6 @@
 from django.db.models.expressions import Func, Expression
 from django.db.models.sql.constants import GET_ITERATOR_CHUNK_SIZE
-from django.utils import six
+import six
 from .expressions import F, Value as V
 
 class SimpleFunc(Func):
@@ -167,4 +167,4 @@ class JSONStripNulls(SimpleFunc):
     function = 'JSON_STRIP_NULLS'
 
 class JSONTypeOf(SimpleFunc):
-    function = 'JSON_TYPE_OF'
\ No newline at end of file
+    function = 'JSON_TYPE_OF'
diff --git a/django_postgres_extensions/models/sql/subqueries.py b/django_postgres_extensions/models/sql/subqueries.py
index 1c337be..56e2b3b 100644
--- a/django_postgres_extensions/models/sql/subqueries.py
+++ b/django_postgres_extensions/models/sql/subqueries.py
@@ -1,5 +1,5 @@
 from django.db.models.sql.subqueries import UpdateQuery as BaseUpdateQuery
-from django.utils import six
+import six
 from django.core.exceptions import FieldError
 
 class UpdateQuery(BaseUpdateQuery):
@@ -31,4 +31,4 @@ def add_update_values(self, values):
                         self.add_related_update(model, field, val)
                         continue
             values_seq.append((field, model, val))
-        return self.add_update_fields(values_seq)
\ No newline at end of file
+        return self.add_update_fields(values_seq)