diff --git a/lower-constraints.txt b/lower-constraints.txt
index c729690e0e00..5b755c46f57c 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -80,7 +80,7 @@ oslo.context==2.21.0
 oslo.db==4.44.0
 oslo.i18n==3.15.3
 oslo.log==3.36.0
-oslo.messaging==7.0.0
+oslo.messaging==10.3.0
 oslo.middleware==3.31.0
 oslo.policy==1.38.0
 oslo.privsep==1.33.2
diff --git a/nova/compute/rpcapi.py b/nova/compute/rpcapi.py
index b78fcd831eac..b2445daa445f 100644
--- a/nova/compute/rpcapi.py
+++ b/nova/compute/rpcapi.py
@@ -18,7 +18,6 @@ Client side of the compute RPC API.
 from oslo_concurrency import lockutils
 from oslo_log import log as logging
 import oslo_messaging as messaging
-from oslo_serialization import jsonutils
 from oslo_utils import excutils
 
 import nova.conf
@@ -868,11 +867,6 @@ class ComputeAPI(object):
         # compute but that also requires plumbing changes through the resize
         # flow for other methods like resize_instance and finish_resize.
         image_p = objects_base.obj_to_primitive(image)
-        # FIXME(sbauza): Serialize/Unserialize the legacy dict because of
-        # oslo.messaging #1529084 to transform datetime values into strings.
-        # tl;dr: datetimes in dicts are not accepted as correct values by the
-        # rpc fake driver.
-        image_p = jsonutils.loads(jsonutils.dumps(image_p))
         msg_args = {'instance': instance,
                     'instance_type': instance_type,
                     'image': image_p,
diff --git a/nova/tests/functional/regressions/test_bug_1843090.py b/nova/tests/functional/regressions/test_bug_1843090.py
index a6a66ac673d6..eac9a931d5d5 100644
--- a/nova/tests/functional/regressions/test_bug_1843090.py
+++ b/nova/tests/functional/regressions/test_bug_1843090.py
@@ -9,11 +9,8 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
-import fixtures
 import mock
 
-from oslo_serialization import jsonutils
-
 import nova.compute
 from nova import exception
 from nova.tests import fixtures as nova_fixtures
@@ -22,31 +19,6 @@ from nova.tests.unit import fake_notifier
 from nova.tests.unit.image import fake as fake_image
 
 
-class RequestSpecImageSerializationFixture(fixtures.Fixture):
-    """A fixture to temporary fix oslo.messaging bug #1529084 by serializing
-    datetime objects into strings in legacy dicts.
-
-    It seems that the fake rpc driver does not accept datetimes as
-    serializable. So we need to hack around in nova to be able to run test with
-    fake RPC.
-    """
-    def __init__(self, test):
-        self.test = test
-
-    def setUp(self):
-        super(RequestSpecImageSerializationFixture, self).setUp()
-        orig_legacy_image = (
-            nova.objects.request_spec.RequestSpec._to_legacy_image)
-
-        def wrap_legacy_image(*args, **kwargs):
-            image_p = orig_legacy_image(*args, **kwargs)
-            return jsonutils.loads(jsonutils.dumps(image_p))
-
-        self.test.stub_out(
-            'nova.objects.request_spec.RequestSpec._to_legacy_image',
-            wrap_legacy_image)
-
-
 class PinnedComputeRpcTests(integrated_helpers.ProviderUsageBaseTestCase):
 
     compute_driver = 'fake.MediumFakeDriver'
@@ -60,8 +32,6 @@ class PinnedComputeRpcTests(integrated_helpers.ProviderUsageBaseTestCase):
         fake_notifier.stub_notifier(self)
         self.addCleanup(fake_notifier.reset)
 
-        self.useFixture(RequestSpecImageSerializationFixture(self))
-
         self.compute1 = self._start_compute(host='host1')
         self.compute2 = self._start_compute(host='host2')
         self.compute3 = self._start_compute(host='host3')
diff --git a/requirements.txt b/requirements.txt
index 1772b4d5290c..4c24a45ef819 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ oslo.upgradecheck>=0.1.1
 oslo.utils>=3.40.2 # Apache-2.0
 oslo.db>=4.44.0 # Apache-2.0
 oslo.rootwrap>=5.8.0 # Apache-2.0
-oslo.messaging>=7.0.0 # Apache-2.0
+oslo.messaging>=10.3.0 # Apache-2.0
 oslo.policy>=1.38.0 # Apache-2.0
 oslo.privsep>=1.33.2 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0