Index: lexicon-3.5.3/lexicon/tests/test_library.py
===================================================================
--- lexicon-3.5.3.orig/lexicon/tests/test_library.py
+++ lexicon-3.5.3/lexicon/tests/test_library.py
@@ -12,7 +12,7 @@ import importlib
 import pkgutil
 from types import ModuleType
 
-import mock
+from unittest import mock
 import pytest
 
 from lexicon.config import ConfigResolver
Index: lexicon-3.5.3/lexicon/tests/providers/test_auto.py
===================================================================
--- lexicon-3.5.3.orig/lexicon/tests/providers/test_auto.py
+++ lexicon-3.5.3/lexicon/tests/providers/test_auto.py
@@ -2,7 +2,7 @@
 import socket
 from unittest import TestCase
 
-import mock
+from unittest import mock
 import pytest
 
 from lexicon.providers.auto import _get_ns_records_domains_for_domain