diff --git a/README.md b/README.md
index 2681b79..662107a 100644
--- a/README.md
+++ b/README.md
@@ -34,16 +34,6 @@ GET https://api.example.org/accounts/?page=4&limit=100
 
 # Permissions
 
-## DjangoModelPermissions
-
-Add ``view`` permission control.
-
-Usage:
-
-```
-from djangorestframework_ext.permissions import DjangoModelPermissions
-```
-
 ## IsCurrentUser
 
 Determine whether the object is the current login user.
diff --git a/rest_framework_ext/permissions.py b/rest_framework_ext/permissions.py
index 4164825..668a173 100644
--- a/rest_framework_ext/permissions.py
+++ b/rest_framework_ext/permissions.py
@@ -1,24 +1,17 @@
-from rest_framework import permissions
+from rest_framework.permissions import BasePermission
 
 
-class DjangoModelPermissions(permissions.DjangoModelPermissions):
-    def __init__(self):
-        self.perms_map['GET'] = ['%(app_label)s.view_%(model_name)s']
-        self.perms_map['OPTIONS'] = ['%(app_label)s.view_%(model_name)s']
-        self.perms_map['HEAD'] = ['%(app_label)s.view_%(model_name)s']
-
-
-class IsCurrentUser(permissions.BasePermission):
+class IsCurrentUser(BasePermission):
     def has_object_permission(self, request, view, obj):
         return obj == request.user
 
 
-class IsSuperuser(permissions.BasePermission):
+class IsSuperuser(BasePermission):
     def has_permission(self, request, view):
         return bool(request.user and request.user.is_superuser)
 
 
-class ExportPermission(permissions.BasePermission):
+class ExportPermission(BasePermission):
     def has_permission(self, request, view):
         if view.action == 'export':
             model = view.get_queryset().model
diff --git a/setup.py b/setup.py
index b0bcbc5..2ddaf31 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name='djangorestframework-ext',
-    version='0.19',
+    version='0.20',
     url='https://github.com/zengqiu/django-rest-framework-ext',
     license='MIT',
     author='zengqiu',
@@ -18,7 +18,7 @@
     long_description_content_type='text/markdown',
     packages=find_packages(),
     platforms='any',
-    install_requires=['django>=3.2', 'djangorestframework>=3.10.0'],
+    install_requires=['django>=3.2', 'djangorestframework>=3.15'],
     python_requires='>=3.5',
     classifiers=[
         'Development Status :: 5 - Production/Stable',