diff --git a/HACKING.rst b/HACKING.rst
index 19b0098170c..da137db0eee 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -26,6 +26,8 @@ Below you can find a list of checks specific to this repository.
 - [N343] Production code must not import from neutron.tests.*
 - [N344] Python 3: Do not use filter(lambda obj: test(obj), data). Replace it
   with [obj for obj in data if test(obj)].
+- [N346] Use neutron_lib.db.api.sqla_listen rather than sqlalchemy
+- [N347] Test code must not import mock library
 
 .. note::
    When adding a new hacking check to this repository or ``neutron-lib``, make
diff --git a/lower-constraints.txt b/lower-constraints.txt
index b436a88f511..0672190c3f9 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -44,7 +44,6 @@ logilab-common==1.4.1
 logutils==0.3.5
 Mako==0.4.0
 MarkupSafe==1.0
-mock==3.0.0
 monotonic==0.6;python_version<'3.3'
 mox3==0.20.0
 msgpack-python==0.4.0
diff --git a/neutron/tests/unit/common/ovn/test_utils.py b/neutron/tests/unit/common/ovn/test_utils.py
index e2bcd6cd137..489a388842b 100644
--- a/neutron/tests/unit/common/ovn/test_utils.py
+++ b/neutron/tests/unit/common/ovn/test_utils.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from unittest import mock
+
 import fixtures
-import mock
 from neutron_lib.api.definitions import extra_dhcp_opt as edo_ext
 
 from neutron.common.ovn import constants
diff --git a/tox.ini b/tox.ini
index cfe56460b78..0a78657937f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -172,8 +172,17 @@ import-order-style = pep8
 [flake8:local-plugins]
 extension =
   # Checks specific to neutron repo
+  N322 = neutron.hacking.checks:check_assert_called_once_with
+  N328 = neutron.hacking.checks:check_asserttruefalse
+  N330 = neutron.hacking.checks:check_assertempty
+  N331 = neutron.hacking.checks:check_assertisinstance
+  N332 = neutron.hacking.checks:check_assertequal_for_httpcode
   N340 = neutron.hacking.checks:check_oslo_i18n_wrapper
   N341 = neutron.hacking.checks:check_builtins_gettext
+  N343 = neutron.hacking.checks:check_no_imports_from_tests
+  N344 = neutron.hacking.checks:check_python3_no_filter
+  N346 = neutron.hacking.checks:check_no_sqlalchemy_event_import
+  N347 = neutron.hacking.checks:check_no_import_mock
   # Checks from neutron-lib
   N521 = neutron_lib.hacking.checks:use_jsonutils
   N524 = neutron_lib.hacking.checks:check_no_contextlib_nested