diff --git a/blazarclient/tests/v1/shell_commands/test_leases.py b/blazarclient/tests/v1/shell_commands/test_leases.py
index 8355315..6af44ac 100644
--- a/blazarclient/tests/v1/shell_commands/test_leases.py
+++ b/blazarclient/tests/v1/shell_commands/test_leases.py
@@ -28,7 +28,7 @@ FIRST_LEASE = 'd1e43d6d-8f6f-4c2e-b0a9-2982b39dc698'
 SECOND_LEASE = '424d21c3-45a2-448a-81ad-32eddc888375'
 
 
-@mock.patch('blazarclient.v1.shell_commands.leases._utc_now', mock_time)
+@mock.patch('oslo_utils.timeutils.utcnow', mock_time)
 class CreateLeaseTestCase(tests.TestCase):
 
     def setUp(self):
diff --git a/blazarclient/v1/shell_commands/leases.py b/blazarclient/v1/shell_commands/leases.py
index 3f8b407..9f767fa 100644
--- a/blazarclient/v1/shell_commands/leases.py
+++ b/blazarclient/v1/shell_commands/leases.py
@@ -20,6 +20,7 @@ import re
 
 from oslo_serialization import jsonutils
 from oslo_utils import strutils
+from oslo_utils import timeutils
 
 from blazarclient import command
 from blazarclient import exception
@@ -64,16 +65,6 @@ CREATE_RESERVATION_KEYS = {
 }
 
 
-def _utc_now():
-    """Wrap datetime.datetime.utcnow so it can be mocked in unit tests.
-
-    This is required because some of the tests require understanding the
-    'current time'; simply mocking utcnow() is made very difficult by
-    the many different ways the datetime package is used in this module.
-    """
-    return datetime.datetime.utcnow()
-
-
 class ListLeases(command.ListCommand):
     """Print a list of leases."""
     resource = 'lease'
@@ -113,7 +104,7 @@ class CreateLeaseBase(command.CreateCommand):
     json_indent = 4
     log = logging.getLogger(__name__ + '.CreateLease')
     default_start = 'now'
-    default_end = _utc_now() + datetime.timedelta(days=1)
+    default_end = timeutils.utcnow() + datetime.timedelta(days=1)
 
     def get_parser(self, prog_name):
         parser = super(CreateLeaseBase, self).get_parser(prog_name)
@@ -189,7 +180,7 @@ class CreateLeaseBase(command.CreateCommand):
                 raise exception.IncorrectLease
 
         if parsed_args.start == 'now':
-            start = _utc_now()
+            start = timeutils.utcnow()
         else:
             start = parsed_args.start
 
diff --git a/requirements.txt b/requirements.txt
index a983a02..035afb8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,6 @@ cliff!=2.9.0,>=2.8.0 # Apache-2.0
 PrettyTable>=0.7.1 # BSD
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
-oslo.utils>=3.33.0 # Apache-2.0
+oslo.utils>=7.0.0 # Apache-2.0
 keystoneauth1>=3.4.0 # Apache-2.0
 osc-lib>=1.3.0 # Apache-2.0