diff --git a/lower-constraints.txt b/lower-constraints.txt
index a949cdd7c..992bbaddf 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -44,7 +44,6 @@ linecache2==1.0.0
 MarkupSafe==1.0
 mccabe==0.2.1
 mistral-lib==1.2.0
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6
diff --git a/molecule-requirements.txt b/molecule-requirements.txt
index 69d6b898b..57dc64088 100644
--- a/molecule-requirements.txt
+++ b/molecule-requirements.txt
@@ -6,6 +6,5 @@ pytest
 pytest-cov
 pytest-html
 pytest-xdist
-mock
 molecule>=2.22rc1,<3
 selinux  # MIT
diff --git a/tripleo_validations/tests/library/test_check_ironic_boot_config.py b/tripleo_validations/tests/library/test_check_ironic_boot_config.py
index b56641afa..3a89a5f53 100644
--- a/tripleo_validations/tests/library/test_check_ironic_boot_config.py
+++ b/tripleo_validations/tests/library/test_check_ironic_boot_config.py
@@ -13,12 +13,11 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from unittest import mock
 
 import library.check_ironic_boot_config as validation
 from tripleo_validations.tests import base
 
-import mock
-
 UUIDs = [
     '13c319a4-7704-4b44-bb2e-501951879f96',
     '8201bb8e-be20-4a97-bcf4-91bcf7eeff86',