diff --git a/polymorphic/admin/childadmin.py b/polymorphic/admin/childadmin.py
index 0a197a8..2a4e9d3 100644
--- a/polymorphic/admin/childadmin.py
+++ b/polymorphic/admin/childadmin.py
@@ -4,7 +4,7 @@ The child admin displays the change/delete view of the subclass model.
 import inspect
 
 from django.contrib import admin
-from django.core.urlresolvers import resolve
+from django.urls import resolve
 from django.utils import six
 from django.utils.translation import ugettext_lazy as _
 
diff --git a/polymorphic/admin/parentadmin.py b/polymorphic/admin/parentadmin.py
index ae1201e..1d04cc8 100644
--- a/polymorphic/admin/parentadmin.py
+++ b/polymorphic/admin/parentadmin.py
@@ -10,9 +10,9 @@ from django.contrib.admin.helpers import AdminErrorList, AdminForm
 from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
 from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import PermissionDenied
-from django.core.urlresolvers import RegexURLResolver
 from django.http import Http404, HttpResponseRedirect
 from django.template.response import TemplateResponse
+from django.urls import RegexURLResolver
 from django.utils.encoding import force_text
 from django.utils.http import urlencode
 from django.utils.safestring import mark_safe