diff --git a/lower-constraints.txt b/lower-constraints.txt
index 3a3831a274d3..c62d875c076a 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -89,7 +89,7 @@ oslo.privsep==1.23.0
 oslo.reports==1.18.0
 oslo.rootwrap==5.8.0
 oslo.serialization==2.18.0
-oslo.service==1.24.0
+oslo.service==1.33.0
 oslo.utils==3.37.0
 oslo.versionedobjects==1.33.3
 oslo.vmware==2.17.0
diff --git a/nova/tests/unit/compute/test_compute_mgr.py b/nova/tests/unit/compute/test_compute_mgr.py
index a9d0f70e8c17..c1b8f4154a11 100644
--- a/nova/tests/unit/compute/test_compute_mgr.py
+++ b/nova/tests/unit/compute/test_compute_mgr.py
@@ -27,6 +27,7 @@ import netaddr
 from oslo_log import log as logging
 import oslo_messaging as messaging
 from oslo_serialization import jsonutils
+from oslo_service import fixture as service_fixture
 from oslo_utils.fixture import uuidsentinel as uuids
 from oslo_utils import timeutils
 from oslo_utils import uuidutils
@@ -6444,6 +6445,7 @@ class ComputeManagerBuildInstanceTestCase(test.NoDBTestCase):
         """Tests that _try_deallocate_network will retry calling
         _deallocate_network on keystone ConnectFailure errors up to a limit.
         """
+        self.useFixture(service_fixture.SleepFixture())
         deallocate_network_mock.side_effect = \
             keystone_exception.connection.ConnectFailure
         req_networks = objects.NetworkRequestList(
diff --git a/nova/tests/unit/virt/disk/mount/test_api.py b/nova/tests/unit/virt/disk/mount/test_api.py
index baaa81ae7d93..d2d040dd8495 100644
--- a/nova/tests/unit/virt/disk/mount/test_api.py
+++ b/nova/tests/unit/virt/disk/mount/test_api.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 import mock
+from oslo_service import fixture as service_fixture
 
 from nova import test
 from nova.virt.disk.mount import api
@@ -29,6 +30,11 @@ MAP_PARTITION = "/dev/mapper/nullp77"
 
 
 class MountTestCase(test.NoDBTestCase):
+    def setUp(self):
+        super(MountTestCase, self).setUp()
+        # Make RetryDecorator not actually sleep on retries
+        self.useFixture(service_fixture.SleepFixture())
+
     def _test_map_dev(self, partition):
         mount = api.Mount(mock.sentinel.image, mock.sentinel.mount_dir)
         mount.device = ORIG_DEVICE
diff --git a/nova/tests/unit/virt/libvirt/test_guest.py b/nova/tests/unit/virt/libvirt/test_guest.py
index f0bba568a0c0..418092eee236 100644
--- a/nova/tests/unit/virt/libvirt/test_guest.py
+++ b/nova/tests/unit/virt/libvirt/test_guest.py
@@ -17,6 +17,7 @@
 import sys
 
 import mock
+from oslo_service import fixture as service_fixture
 from oslo_utils import encodeutils
 import six
 import testtools
@@ -46,6 +47,9 @@ class GuestTestCase(test.NoDBTestCase):
         self.domain = mock.Mock(spec=fakelibvirt.virDomain)
         self.guest = libvirt_guest.Guest(self.domain)
 
+        # Make RetryDecorator not actually sleep on retries
+        self.useFixture(service_fixture.SleepFixture())
+
     def test_repr(self):
         self.domain.ID.return_value = 99
         self.domain.UUIDString.return_value = "UUID"
diff --git a/requirements.txt b/requirements.txt
index 428a95c64ddd..9ce1b74e386a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ oslo.messaging>=6.3.0 # Apache-2.0
 oslo.policy>=1.35.0 # Apache-2.0
 oslo.privsep>=1.23.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
-oslo.service!=1.28.1,>=1.24.0 # Apache-2.0
+oslo.service>=1.33.0 # Apache-2.0
 rfc3986>=0.3.1 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 psutil>=3.2.2 # BSD