diff --git a/nova/api/openstack/compute/schemas/flavors.py b/nova/api/openstack/compute/schemas/flavors.py
index f0cecb3dc493..6f4d609e6554 100644
--- a/nova/api/openstack/compute/schemas/flavors.py
+++ b/nova/api/openstack/compute/schemas/flavors.py
@@ -50,7 +50,7 @@ create = {
                 'rxtx_factor': {
                     'type': ['number', 'string'],
                     'pattern': r'^[0-9]+(\.[0-9]+)?$',
-                    'minimum': 0, 'exclusiveMinimum': True,
+                    'minimum': 1,
                     # maximum's value is limited to db constant's
                     # SQL_SP_FLOAT_MAX (in nova/db/constants.py)
                     'maximum': 3.40282e+38
diff --git a/nova/api/openstack/compute/schemas/server_groups.py b/nova/api/openstack/compute/schemas/server_groups.py
index 102c6df869ec..fee2cbd30b98 100644
--- a/nova/api/openstack/compute/schemas/server_groups.py
+++ b/nova/api/openstack/compute/schemas/server_groups.py
@@ -31,7 +31,7 @@ create = {
                     # enumerated values. It's changed to a single string value
                     # in 2.64.
                     'type': 'array',
-                    'items': [
+                    'prefixItems': [
                         {
                             'type': 'string',
                             'enum': ['anti-affinity', 'affinity'],
@@ -53,7 +53,9 @@ create = {
 
 create_v215 = copy.deepcopy(create)
 policies = create_v215['properties']['server_group']['properties']['policies']
-policies['items'][0]['enum'].extend(['soft-anti-affinity', 'soft-affinity'])
+policies['prefixItems'][0]['enum'].extend(
+    ['soft-anti-affinity', 'soft-affinity']
+)
 
 create_v264 = copy.deepcopy(create_v215)
 del create_v264['properties']['server_group']['properties']['policies']
diff --git a/nova/api/validation/validators.py b/nova/api/validation/validators.py
index b0e9478d35e2..e09bdb427bf6 100644
--- a/nova/api/validation/validators.py
+++ b/nova/api/validation/validators.py
@@ -271,7 +271,7 @@ class FormatChecker(jsonschema.FormatChecker):
 class _SchemaValidator(object):
     """A validator class
 
-    This class is changed from Draft4Validator to validate minimum/maximum
+    This class is changed from Draft202012Validator to validate minimum/maximum
     value of a string number(e.g. '10'). This changes can be removed when
     we tighten up the API definition and the XML conversion.
     Also FormatCheckers are added for checking data formats which would be
@@ -279,7 +279,7 @@ class _SchemaValidator(object):
 
     """
     validator = None
-    validator_org = jsonschema.Draft4Validator
+    validator_org = jsonschema.Draft202012Validator
 
     def __init__(self, schema, relax_additional_properties=False,
                  is_body=True):
diff --git a/nova/tests/unit/test_api_validation.py b/nova/tests/unit/test_api_validation.py
index 4937722446e8..ea515702ac64 100644
--- a/nova/tests/unit/test_api_validation.py
+++ b/nova/tests/unit/test_api_validation.py
@@ -548,9 +548,9 @@ class IntegerTestCase(APIValidationTestCase):
         self.check_validation_error(self.post, body={'foo': '0xffff'},
                                     expected_detail=detail)
 
-        detail = ("Invalid input for field/attribute foo. Value: 1.0."
-                  " 1.0 is not of type 'integer', 'string'")
-        self.check_validation_error(self.post, body={'foo': 1.0},
+        detail = ("Invalid input for field/attribute foo. Value: 1.01."
+                  " 1.01 is not of type 'integer', 'string'")
+        self.check_validation_error(self.post, body={'foo': 1.01},
                                     expected_detail=detail)
 
         detail = ("Invalid input for field/attribute foo. Value: 1.0."