diff --git a/csp_advanced/csp.py b/csp_advanced/csp.py
index 8de95e6..4aa4029 100644
--- a/csp_advanced/csp.py
+++ b/csp_advanced/csp.py
@@ -1,7 +1,5 @@
 from itertools import chain
 
-from django.utils import six
-
 
 class InvalidCSPError(ValueError):
     pass
@@ -76,7 +74,7 @@ class CSPCompiler(object):
 
     def compile(self):
         pieces = []
-        for name, value in six.iteritems(self.csp):
+        for name, value in self.csp.items():
             if name in self.CSP_LISTS:
                 if value:
                     pieces.append(self.compile_list(name, value))
@@ -128,5 +126,5 @@ class CSPCompiler(object):
 
     @staticmethod
     def ensure_str(name, value):
-        if not isinstance(value, six.string_types):
+        if not isinstance(value, str):
             raise InvalidCSPError('Values for %s must be a string type, not %s', (name, type(value)))
diff --git a/csp_advanced/middleware.py b/csp_advanced/middleware.py
index ea539bc..9b4b06f 100644
--- a/csp_advanced/middleware.py
+++ b/csp_advanced/middleware.py
@@ -1,7 +1,6 @@
 import logging
 from django.conf import settings
 from django.core.exceptions import MiddlewareNotUsed
-from django.utils import six
 
 from csp_advanced.csp import CSPCompiler, InvalidCSPError
 from csp_advanced.utils import is_callable_csp_dict, call_csp_dict, merge_csp_dict
@@ -13,11 +12,11 @@ class AdvancedCSPMiddleware(object):
     def __init__(self, get_response=None):
         self.get_response = get_response
         self.enforced_csp = getattr(settings, 'ADVANCED_CSP', None) or {}
-        self.enforced_csp_is_str = isinstance(self.enforced_csp, six.string_types)
+        self.enforced_csp_is_str = isinstance(self.enforced_csp, str)
         self.enforced_csp_callable = is_callable_csp_dict(self.enforced_csp)
         self.report_csp = getattr(settings, 'ADVANCED_CSP_REPORT_ONLY', None) or {}
         self.report_csp_callable = is_callable_csp_dict(self.report_csp)
-        self.report_csp_is_str = isinstance(self.enforced_csp, six.string_types)
+        self.report_csp_is_str = isinstance(self.enforced_csp, str)
         self.report_only_csp = not self.enforced_csp
 
         if not self.enforced_csp and not self.report_csp:
diff --git a/csp_advanced/utils.py b/csp_advanced/utils.py
index 37be05c..145537a 100644
--- a/csp_advanced/utils.py
+++ b/csp_advanced/utils.py
@@ -1,12 +1,9 @@
-from django.utils import six
-
-
 def is_callable_csp_dict(data):
     if callable(data):
         return True
     if not isinstance(data, dict):
         return False
-    return any(callable(value) for value in six.itervalues(data))
+    return any(callable(value) for value in data.values())
 
 
 def call_csp_dict(data, request, response):
@@ -14,7 +11,7 @@ def call_csp_dict(data, request, response):
         return data(request, response)
 
     result = {}
-    for key, value in six.iteritems(data):
+    for key, value in data.items():
         if callable(value):
             result[key] = value(request, response)
         else:
@@ -24,7 +21,7 @@ def call_csp_dict(data, request, response):
 
 def merge_csp_dict(template, override):
     result = template.copy()
-    for key, value in six.iteritems(override):
+    for key, value in override.items():
         if key not in result:
             result[key] = value
             continue