diff --git a/jsignature/fields.py b/jsignature/fields.py
index b6b771e..831cf91 100644
--- a/jsignature/fields.py
+++ b/jsignature/fields.py
@@ -3,14 +3,21 @@
     with jSignature jQuery plugin
 """
 import json
-import six
 
 from django.db import models
 from django.core.exceptions import ValidationError
 
 from .forms import (
     JSignatureField as JSignatureFormField,
-    JSIGNATURE_EMPTY_VALUES)
+    JSIGNATURE_EMPTY_VALUES,
+)
+
+try:
+    from django.utils import six
+    string_types = six.string_types
+except ImportError:
+    string_types = str
+
 
 
 class JSignatureField(models.Field):
@@ -39,7 +46,7 @@ class JSignatureField(models.Field):
     def get_prep_value(self, value):
         if value in JSIGNATURE_EMPTY_VALUES:
             return None
-        elif isinstance(value, six.string_types):
+        elif isinstance(value, string_types):
             return value
         elif isinstance(value, list):
             return json.dumps(value)
@@ -49,9 +56,3 @@ class JSignatureField(models.Field):
         defaults = {'form_class': JSignatureFormField}
         defaults.update(kwargs)
         return super(JSignatureField, self).formfield(**defaults)
-
-try:
-    from south.modelsinspector import add_introspection_rules
-    add_introspection_rules([], ["jsignature.fields.JSignatureField"])
-except ImportError:
-    pass
diff --git a/jsignature/widgets.py b/jsignature/widgets.py
index 0f4b8b2..5a0e5cc 100644
--- a/jsignature/widgets.py
+++ b/jsignature/widgets.py
@@ -3,7 +3,6 @@
     with jSignature jQuery plugin
 """
 import json
-import six
 
 from django.template.loader import render_to_string
 from django.forms.widgets import HiddenInput
@@ -17,6 +16,13 @@ from jsignature.settings import JSIGNATURE_DEFAULT_CONFIG
 JSIGNATURE_EMPTY_VALUES = validators.EMPTY_VALUES + ('[]', )
 
 
+try:
+    from django.utils import six
+    string_types = six.string_types
+except ImportError:
+    string_types = str
+
+
 class JSignatureWidget(HiddenInput):
     """
     A widget handling a signature capture field with with jSignature
@@ -54,7 +60,7 @@ class JSignatureWidget(HiddenInput):
         """ Prepare value before effectively render widget """
         if value in JSIGNATURE_EMPTY_VALUES:
             return "[]"
-        elif isinstance(value, six.string_types):
+        elif isinstance(value, string_types):
             return value
         elif isinstance(value, list):
             return json.dumps(value)
diff --git a/requirements.txt b/requirements.txt
index 170f7c9..ac223e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,2 @@
 pillow
 pyquery
-six
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 5a432cc..fb438c3 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -1,5 +1,4 @@
 import json
-import six
 
 from django.test import SimpleTestCase
 from django.core.exceptions import ValidationError
@@ -7,6 +6,13 @@ from django.core.exceptions import ValidationError
 from jsignature.fields import JSignatureField
 from jsignature.forms import JSignatureField as JSignatureFormField
 
+try:
+    from django.utils import six
+
+    string_types = six.string_types
+except ImportError:
+    string_types = str
+
 
 class JSignatureFieldTest(SimpleTestCase):
 
@@ -40,7 +46,7 @@ class JSignatureFieldTest(SimpleTestCase):
         f = JSignatureField()
         val = [{"x": [1, 2], "y": [3, 4]}]
         val_prep = f.get_prep_value(val)
-        self.assertIsInstance(val_prep, six.string_types)
+        self.assertIsInstance(val_prep, string_types)
         self.assertEquals(val, json.loads(val_prep))
 
     def test_get_prep_value_correct_values_json(self):
@@ -48,7 +54,7 @@ class JSignatureFieldTest(SimpleTestCase):
         val = [{"x": [1, 2], "y": [3, 4]}]
         val_str = '[{"x":[1,2], "y":[3,4]}]'
         val_prep = f.get_prep_value(val_str)
-        self.assertIsInstance(val_prep, six.string_types)
+        self.assertIsInstance(val_prep, string_types)
         self.assertEquals(val, json.loads(val_prep))
 
     def test_get_prep_value_incorrect_values(self):
diff --git a/tests/test_widgets.py b/tests/test_widgets.py
index 42cabe1..6a6c982 100644
--- a/tests/test_widgets.py
+++ b/tests/test_widgets.py
@@ -1,6 +1,5 @@
 import json
 from pyquery import PyQuery as pq
-import six
 
 from django.test import SimpleTestCase
 from django.core.exceptions import ValidationError
@@ -8,6 +7,13 @@ from django.core.exceptions import ValidationError
 from jsignature.widgets import JSignatureWidget
 from jsignature.settings import JSIGNATURE_HEIGHT
 
+try:
+    from django.utils import six
+
+    string_types = six.string_types
+except ImportError:
+    string_types = str
+
 
 class JSignatureWidgetTest(SimpleTestCase):
 
@@ -49,7 +55,7 @@ class JSignatureWidgetTest(SimpleTestCase):
         w = JSignatureWidget()
         val = [{"x": [1, 2], "y": [3, 4]}]
         val_prep = w.prep_value(val)
-        self.assertIsInstance(val_prep, six.string_types)
+        self.assertIsInstance(val_prep, string_types)
         self.assertEquals(val, json.loads(val_prep))
 
     def test_prep_value_correct_values_json(self):
@@ -57,7 +63,7 @@ class JSignatureWidgetTest(SimpleTestCase):
         val = [{"x": [1, 2], "y": [3, 4]}]
         val_str = '[{"x":[1,2], "y":[3,4]}]'
         val_prep = w.prep_value(val_str)
-        self.assertIsInstance(val_prep, six.string_types)
+        self.assertIsInstance(val_prep, string_types)
         self.assertEquals(val, json.loads(val_prep))
 
     def test_prep_value_incorrect_values(self):