diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index 1b7524c6c..55c173df4 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -132,13 +132,13 @@ class BasePagination(object):
     display_page_controls = False
 
     def paginate_queryset(self, queryset, request, view=None):  # pragma: no cover
-        raise NotImplemented('paginate_queryset() must be implemented.')
+        raise NotImplementedError('paginate_queryset() must be implemented.')
 
     def get_paginated_response(self, data):  # pragma: no cover
-        raise NotImplemented('get_paginated_response() must be implemented.')
+        raise NotImplementedError('get_paginated_response() must be implemented.')
 
     def to_html(self):  # pragma: no cover
-        raise NotImplemented('to_html() must be implemented to display page controls.')
+        raise NotImplementedError('to_html() must be implemented to display page controls.')
 
 
 class PageNumberPagination(BasePagination):
diff --git a/rest_framework/versioning.py b/rest_framework/versioning.py
index e31c71e9b..a07b629fe 100644
--- a/rest_framework/versioning.py
+++ b/rest_framework/versioning.py
@@ -17,7 +17,7 @@ class BaseVersioning(object):
 
     def determine_version(self, request, *args, **kwargs):
         msg = '{cls}.determine_version() must be implemented.'
-        raise NotImplemented(msg.format(
+        raise NotImplementedError(msg.format(
             cls=self.__class__.__name__
         ))