diff --git a/blazar/tests/utils/openstack/test_placement.py b/blazar/tests/utils/openstack/test_placement.py
index b5cecc84..5b98cc6a 100644
--- a/blazar/tests/utils/openstack/test_placement.py
+++ b/blazar/tests/utils/openstack/test_placement.py
@@ -11,7 +11,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import json
 import mock
 
 from blazar import tests
@@ -21,6 +20,7 @@ from blazar.utils.openstack import placement
 
 from oslo_config import cfg
 from oslo_config import fixture as conf_fixture
+from oslo_serialization import jsonutils
 from oslo_utils import uuidutils
 
 CONF = cfg.CONF
@@ -113,7 +113,7 @@ class TestPlacementClient(tests.TestCase):
         }
 
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_json_data))
+            200, content=jsonutils.dumps(mock_json_data))
 
         result = self.client.get_resource_provider(rp_name)
 
@@ -139,7 +139,7 @@ class TestPlacementClient(tests.TestCase):
         }
 
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_json_data))
+            200, content=jsonutils.dumps(mock_json_data))
 
         result = self.client.get_resource_provider(rp_name)
 
@@ -173,7 +173,7 @@ class TestPlacementClient(tests.TestCase):
                           'parent_provider_uuid': parent_uuid}
 
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_json_data))
+            200, content=jsonutils.dumps(mock_json_data))
 
         result = self.client.create_resource_provider(
             rp_name, rp_uuid=rp_uuid, parent_uuid=parent_uuid)
@@ -244,9 +244,9 @@ class TestPlacementClient(tests.TestCase):
                           'generation': 0,
                           'parent_provider_uuid': host_uuid}
         mock_call1 = fake_requests.FakeResponse(
-            200, content=json.dumps(get_json_mock))
+            200, content=jsonutils.dumps(get_json_mock))
         mock_call2 = fake_requests.FakeResponse(
-            200, content=json.dumps(post_json_mock))
+            200, content=jsonutils.dumps(post_json_mock))
         kss_req.side_effect = [mock_call1, mock_call2]
 
         self.client.create_reservation_provider(host_name)
@@ -274,7 +274,7 @@ class TestPlacementClient(tests.TestCase):
         host_name = "compute-1"
         get_json_mock = {'resource_providers': []}
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(get_json_mock))
+            200, content=jsonutils.dumps(get_json_mock))
         self.assertRaises(
             exceptions.ResourceProviderNotFound,
             self.client.create_reservation_provider, host_name)
@@ -296,7 +296,7 @@ class TestPlacementClient(tests.TestCase):
             ]
         }
         mock_call1 = fake_requests.FakeResponse(
-            200, content=json.dumps(get_json_mock))
+            200, content=jsonutils.dumps(get_json_mock))
         mock_call2 = fake_requests.FakeResponse(200)
         kss_req.side_effect = [mock_call1, mock_call2]
 
@@ -326,7 +326,7 @@ class TestPlacementClient(tests.TestCase):
             'resource_providers': []
         }
         mock_call1 = fake_requests.FakeResponse(
-            200, content=json.dumps(get_json_mock))
+            200, content=jsonutils.dumps(get_json_mock))
         mock_call2 = fake_requests.FakeResponse(200)
         kss_req.side_effect = [mock_call1, mock_call2]
 
@@ -425,7 +425,7 @@ class TestPlacementClient(tests.TestCase):
             "resource_provider_generation": curr_gen
         }
         client_get.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_get_inv_json))
+            200, content=jsonutils.dumps(mock_get_inv_json))
 
         # Build the mock of "updated" inventory for update_inventory()
         update_gen = 12
@@ -451,7 +451,7 @@ class TestPlacementClient(tests.TestCase):
             "resource_provider_generation": update_gen
         }
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_put_json))
+            200, content=jsonutils.dumps(mock_put_json))
 
         result = self.client.update_reservation_inventory(host_name, 'add', 3)
 
@@ -516,7 +516,7 @@ class TestPlacementClient(tests.TestCase):
             "resource_provider_generation": curr_gen
         }
         client_get.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_get_inv_json))
+            200, content=jsonutils.dumps(mock_get_inv_json))
 
         # Build the mock of "updated" inventory for update_inventory()
         update_gen = 1
@@ -534,7 +534,7 @@ class TestPlacementClient(tests.TestCase):
             "resource_provider_generation": update_gen
         }
         kss_req.return_value = fake_requests.FakeResponse(
-            200, content=json.dumps(mock_put_json))
+            200, content=jsonutils.dumps(mock_put_json))
 
         result = self.client.update_reservation_inventory(host_name, 'add', 3)