diff --git a/python-HyperKitty-no-mock.patch b/python-HyperKitty-no-mock.patch
new file mode 100644
index 0000000..2345e34
--- /dev/null
+++ b/python-HyperKitty-no-mock.patch
@@ -0,0 +1,192 @@
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/commands/test_import.py HyperKitty-1.3.5/hyperkitty/tests/commands/test_import.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/commands/test_import.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/commands/test_import.py	2022-05-26 11:03:59.326617643 +0200
+@@ -15,7 +15,7 @@ from django.core.management import call_
+ from django.db import DEFAULT_DB_ALIAS
+ from django.utils.timezone import utc
+ 
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.management.commands.hyperkitty_import import Command
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/commands/test_mailman_sync.py HyperKitty-1.3.5/hyperkitty/tests/commands/test_mailman_sync.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/commands/test_mailman_sync.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/commands/test_mailman_sync.py	2022-05-26 11:03:59.326617643 +0200
+@@ -22,7 +22,7 @@
+ 
+ from django.core.management import call_command
+ 
+-from mock import patch
++from unittest.mock import patch
+ 
+ from hyperkitty.tests.utils import TestCase
+ 
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_incoming.py HyperKitty-1.3.5/hyperkitty/tests/lib/test_incoming.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_incoming.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/lib/test_incoming.py	2022-05-26 11:03:59.326617643 +0200
+@@ -30,7 +30,7 @@ from django.core.cache import cache
+ from django.db import DataError, IntegrityError
+ from django.utils import timezone
+ 
+-import mock
++from unittest import mock
+ 
+ from hyperkitty.lib.incoming import DuplicateMessage, add_to_list
+ from hyperkitty.lib.utils import get_message_id_hash
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_mailman.py HyperKitty-1.3.5/hyperkitty/tests/lib/test_mailman.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_mailman.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/lib/test_mailman.py	2022-05-26 11:03:59.326617643 +0200
+@@ -26,7 +26,7 @@ from django.contrib.auth.models import U
+ from django.core.cache import cache
+ 
+ from django_mailman3.tests.utils import FakeMMList, FakeMMPage
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ from hyperkitty.lib import mailman
+ from hyperkitty.models import MailingList, Sender
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_posting.py HyperKitty-1.3.5/hyperkitty/tests/lib/test_posting.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/lib/test_posting.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/lib/test_posting.py	2022-05-26 11:03:59.326617643 +0200
+@@ -28,7 +28,7 @@ from django.core import mail
+ from django.test.client import RequestFactory
+ 
+ from django_mailman3.tests.utils import FakeMMList, FakeMMMember
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ from hyperkitty.lib import posting
+ from hyperkitty.models import MailingList
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/_test_caching.py HyperKitty-1.3.5/hyperkitty/tests/_test_caching.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/_test_caching.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/_test_caching.py	2022-05-26 11:03:59.326617643 +0200
+@@ -8,7 +8,7 @@ from urllib.error import HTTPError
+ 
+ from mailman.email.message import Message
+ from mailman.interfaces.archiver import ArchivePolicy
+-from mock import Mock
++from unittest.mock import Mock
+ 
+ 
+ #import kittystore.utils
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/test_signals.py HyperKitty-1.3.5/hyperkitty/tests/test_signals.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/test_signals.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/test_signals.py	2022-05-26 11:03:59.326617643 +0200
+@@ -21,7 +21,7 @@
+ #
+ 
+ from django_mailman3.signals import mailinglist_created, mailinglist_modified
+-from mock import patch
++from unittest.mock import patch
+ 
+ from hyperkitty.tests.utils import TestCase
+ 
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/test_tasks.py HyperKitty-1.3.5/hyperkitty/tests/test_tasks.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/test_tasks.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/test_tasks.py	2022-05-26 11:03:59.330617665 +0200
+@@ -22,7 +22,7 @@
+ 
+ from email.message import EmailMessage
+ 
+-from mock import patch
++from unittest.mock import patch
+ 
+ from hyperkitty import tasks
+ from hyperkitty.lib.incoming import add_to_list
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/utils.py HyperKitty-1.3.5/hyperkitty/tests/utils.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/utils.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/utils.py	2022-05-26 11:03:59.330617665 +0200
+@@ -37,7 +37,7 @@ from django.test import TestCase as Djan
+ from django.test import TransactionTestCase
+ 
+ import mailmanclient
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ 
+ def setup_logging(tmpdir):
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_accounts.py HyperKitty-1.3.5/hyperkitty/tests/views/test_accounts.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_accounts.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_accounts.py	2022-05-26 11:03:59.330617665 +0200
+@@ -31,7 +31,7 @@ from django.contrib.auth.models import U
+ 
+ from allauth.account.models import EmailAddress
+ from django_mailman3.tests.utils import FakeMMList, FakeMMMember
+-from mock import Mock
++from unittest.mock import Mock
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.lib.utils import get_message_id_hash
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_archives.py HyperKitty-1.3.5/hyperkitty/tests/views/test_archives.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_archives.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_archives.py	2022-05-26 11:03:59.330617665 +0200
+@@ -34,7 +34,7 @@ from django.core.cache import cache
+ 
+ from bs4 import BeautifulSoup
+ from django_mailman3.tests.utils import FakeMMList, FakeMMMember
+-from mock import Mock
++from unittest.mock import Mock
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.models import (
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_index.py HyperKitty-1.3.5/hyperkitty/tests/views/test_index.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_index.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_index.py	2022-05-26 11:03:59.330617665 +0200
+@@ -31,7 +31,7 @@ from django.test import override_setting
+ 
+ from django_mailman3.models import MailDomain
+ from django_mailman3.tests.utils import FakeMMList, FakeMMMember
+-from mock import Mock
++from unittest.mock import Mock
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.models import ArchivePolicy, MailingList
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_mailman.py HyperKitty-1.3.5/hyperkitty/tests/views/test_mailman.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_mailman.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_mailman.py	2022-05-26 11:03:59.330617665 +0200
+@@ -27,7 +27,7 @@ from io import BytesIO
+ from django.conf import settings
+ from django.contrib.sites.models import Site
+ 
+-import mock
++from unittest import mock
+ from django_mailman3.models import MailDomain
+ 
+ from hyperkitty.models.email import Email
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_message.py HyperKitty-1.3.5/hyperkitty/tests/views/test_message.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_message.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_message.py	2022-05-26 11:03:59.330617665 +0200
+@@ -36,7 +36,7 @@ from django.utils import timezone
+ from allauth.account.models import EmailAddress
+ from django_gravatar.helpers import get_gravatar_url
+ from django_mailman3.tests.utils import get_flash_messages
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.lib.utils import get_message_id_hash
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_search.py HyperKitty-1.3.5/hyperkitty/tests/views/test_search.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_search.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_search.py	2022-05-26 11:03:59.330617665 +0200
+@@ -26,7 +26,7 @@ from django.contrib.auth.models import U
+ 
+ from django_mailman3.tests.utils import FakeMMList, FakeMMMember
+ from haystack import DEFAULT_ALIAS
+-from mock import Mock, patch
++from unittest.mock import Mock, patch
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.models import ArchivePolicy, MailingList
+diff -upr HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_thread.py HyperKitty-1.3.5/hyperkitty/tests/views/test_thread.py
+--- HyperKitty-1.3.5.orig/hyperkitty/tests/views/test_thread.py	2022-05-26 11:03:59.294617461 +0200
++++ HyperKitty-1.3.5/hyperkitty/tests/views/test_thread.py	2022-05-26 11:03:59.330617665 +0200
+@@ -31,7 +31,7 @@ from django.test import override_setting
+ 
+ from bs4 import BeautifulSoup
+ from django_mailman3.tests.utils import get_flash_messages
+-from mock import patch
++from unittest.mock import patch
+ 
+ from hyperkitty.lib.incoming import add_to_list
+ from hyperkitty.models import Email, MailingList, Tag, Tagging, Thread
diff --git a/python-HyperKitty.changes b/python-HyperKitty.changes
index b31bdeb..e684e46 100644
--- a/python-HyperKitty.changes
+++ b/python-HyperKitty.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Thu May 26 09:19:37 UTC 2022 - pgajdos@suse.com
+
+- do not require python-mock for build
+- added patches
+  fix https://gitlab.com/mailman/hyperkitty/-/issues/429
+  + python-HyperKitty-no-mock.patch
+
 -------------------------------------------------------------------
 Tue Dec 28 07:02:11 UTC 2021 - John Vandenberg <jayvdb@gmail.com>
 
diff --git a/python-HyperKitty.spec b/python-HyperKitty.spec
index 612ddbc..4da3e88 100644
--- a/python-HyperKitty.spec
+++ b/python-HyperKitty.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package python-HyperKitty
 #
-# Copyright (c) 2021 SUSE LLC
+# Copyright (c) 2022 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -61,6 +61,8 @@ Patch0:         hyperkitty-settings.patch
 Patch1:         hyperkitty-fix-mistune-2.0-imports.patch
 # PATCH-FIX-UPSTREAM hyperkitty-django4.patch gl#mailman/hyperkitty#384 jayvdb@gmail.com
 Patch2:         hyperkitty-django4.patch
+# https://gitlab.com/mailman/hyperkitty/-/issues/429
+Patch3:         python-HyperKitty-no-mock.patch
 #
 BuildRequires:  %{python_module django-debug-toolbar >= 2.2}
 BuildRequires:  %{python_module isort}
@@ -108,7 +110,6 @@ BuildRequires:  %{python_module flufl.lock}
 BuildRequires:  %{python_module lxml}
 BuildRequires:  %{python_module mailmanclient >= 3.3.2}
 BuildRequires:  %{python_module mistune}
-BuildRequires:  %{python_module mock}
 BuildRequires:  %{python_module networkx >= 1.9.1}
 BuildRequires:  %{python_module pytest-django}
 BuildRequires:  %{python_module pytest}
@@ -160,6 +161,7 @@ rsync -a example_project/* build_static_files
 
 %patch0 -p1
 %patch1 -p1
+%patch3 -p1
 
 %build
 sed -i 's|^#!/usr/bin/env.*|#!%{_bindir}/python3|' \