diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index b4f06e3..50fd4f2 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -414,6 +414,10 @@
 
   .. _2.71: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id64
 
+  * `2.73`_
+
+  .. _2.73: https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id66
+
 * Volume
 
   * `3.3`_
diff --git a/tempest/lib/api_schema/response/compute/v2_73/__init__.py b/tempest/lib/api_schema/response/compute/v2_73/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tempest/lib/api_schema/response/compute/v2_73/__init__.py
diff --git a/tempest/lib/api_schema/response/compute/v2_73/servers.py b/tempest/lib/api_schema/response/compute/v2_73/servers.py
new file mode 100644
index 0000000..6e491e9
--- /dev/null
+++ b/tempest/lib/api_schema/response/compute/v2_73/servers.py
@@ -0,0 +1,78 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    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 copy
+
+from tempest.lib.api_schema.response.compute.v2_71 import servers as servers271
+
+
+###########################################################################
+#
+# 2.73:
+#
+# The locked_reason parameter is now returned in the response body of the
+# following calls:
+#
+# - POST /servers/{server_id}/action (where the action is rebuild)
+# - PUT /servers/{server_id} (update)
+# - GET /servers/{server_id} (show)
+# - GET /servers/detail (list)
+#
+###########################################################################
+
+# The "locked_reason" parameter will either be a string or None.
+locked_reason = {'type': ['string', 'null']}
+
+rebuild_server = copy.deepcopy(servers271.rebuild_server)
+rebuild_server['response_body']['properties']['server'][
+    'properties'].update({'locked_reason': locked_reason})
+rebuild_server['response_body']['properties']['server'][
+    'required'].append('locked_reason')
+
+rebuild_server_with_admin_pass = copy.deepcopy(
+    servers271.rebuild_server_with_admin_pass)
+rebuild_server_with_admin_pass['response_body']['properties']['server'][
+    'properties'].update({'locked_reason': locked_reason})
+rebuild_server_with_admin_pass['response_body']['properties']['server'][
+    'required'].append('locked_reason')
+
+update_server = copy.deepcopy(servers271.update_server)
+update_server['response_body']['properties']['server'][
+    'properties'].update({'locked_reason': locked_reason})
+update_server['response_body']['properties']['server'][
+    'required'].append('locked_reason')
+
+get_server = copy.deepcopy(servers271.get_server)
+get_server['response_body']['properties']['server'][
+    'properties'].update({'locked_reason': locked_reason})
+get_server['response_body']['properties']['server'][
+    'required'].append('locked_reason')
+
+list_servers_detail = copy.deepcopy(servers271.list_servers_detail)
+list_servers_detail['response_body']['properties']['servers']['items'][
+    'properties'].update({'locked_reason': locked_reason})
+list_servers_detail['response_body']['properties']['servers']['items'][
+    'required'].append('locked_reason')
+
+# NOTE(lajoskatona): Below are the unchanged schema in this microversion. We
+# need to keep this schema in this file to have the generic way to select the
+# right schema based on self.schema_versions_info mapping in service client.
+# ****** Schemas unchanged since microversion 2.71 ***
+list_servers = copy.deepcopy(servers271.list_servers)
+show_server_diagnostics = copy.deepcopy(servers271.show_server_diagnostics)
+get_remote_consoles = copy.deepcopy(servers271.get_remote_consoles)
+list_tags = copy.deepcopy(servers271.list_tags)
+update_all_tags = copy.deepcopy(servers271.update_all_tags)
+delete_all_tags = copy.deepcopy(servers271.delete_all_tags)
+check_tag_existence = copy.deepcopy(servers271.check_tag_existence)
+update_tag = copy.deepcopy(servers271.update_tag)
+delete_tag = copy.deepcopy(servers271.delete_tag)
diff --git a/tempest/lib/services/compute/servers_client.py b/tempest/lib/services/compute/servers_client.py
index a687137..cbf7a8c 100644
--- a/tempest/lib/services/compute/servers_client.py
+++ b/tempest/lib/services/compute/servers_client.py
@@ -35,6 +35,7 @@
 from tempest.lib.api_schema.response.compute.v2_63 import servers as schemav263
 from tempest.lib.api_schema.response.compute.v2_70 import servers as schemav270
 from tempest.lib.api_schema.response.compute.v2_71 import servers as schemav271
+from tempest.lib.api_schema.response.compute.v2_73 import servers as schemav273
 from tempest.lib.api_schema.response.compute.v2_8 import servers as schemav28
 from tempest.lib.api_schema.response.compute.v2_9 import servers as schemav29
 from tempest.lib.common import rest_client
@@ -59,7 +60,8 @@
         {'min': '2.57', 'max': '2.62', 'schema': schemav257},
         {'min': '2.63', 'max': '2.69', 'schema': schemav263},
         {'min': '2.70', 'max': '2.70', 'schema': schemav270},
-        {'min': '2.71', 'max': None, 'schema': schemav271}]
+        {'min': '2.71', 'max': '2.72', 'schema': schemav271},
+        {'min': '2.73', 'max': None, 'schema': schemav273}]
 
     def __init__(self, auth_provider, service, region,
                  enable_instance_password=True, **kwargs):