diff --git a/novaclient/__init__.py b/novaclient/__init__.py
index 0e996a22c..7980a7b3f 100644
--- a/novaclient/__init__.py
+++ b/novaclient/__init__.py
@@ -25,4 +25,4 @@ API_MIN_VERSION = api_versions.APIVersion("2.1")
 # when client supported the max version, and bumped sequentially, otherwise
 # the client may break due to server side new version may include some
 # backward incompatible change.
-API_MAX_VERSION = api_versions.APIVersion("2.27")
+API_MAX_VERSION = api_versions.APIVersion("2.28")
diff --git a/novaclient/tests/functional/v2/legacy/test_hypervisors.py b/novaclient/tests/functional/v2/legacy/test_hypervisors.py
new file mode 100644
index 000000000..36edd60e1
--- /dev/null
+++ b/novaclient/tests/functional/v2/legacy/test_hypervisors.py
@@ -0,0 +1,30 @@
+#    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 six
+
+from novaclient.tests.functional import base
+
+
+class TestHypervisors(base.ClientTestBase):
+
+    COMPUTE_API_VERSION = "2.1"
+
+    def _test_list(self, cpu_info_type):
+        hypervisors = self.client.hypervisors.list()
+        if not len(hypervisors):
+            self.fail("No hypervisors detected.")
+        for hypervisor in hypervisors:
+            self.assertIsInstance(hypervisor.cpu_info, cpu_info_type)
+
+    def test_list(self):
+        self._test_list(six.text_type)
diff --git a/novaclient/tests/functional/v2/test_hypervisors.py b/novaclient/tests/functional/v2/test_hypervisors.py
new file mode 100644
index 000000000..51327a6d9
--- /dev/null
+++ b/novaclient/tests/functional/v2/test_hypervisors.py
@@ -0,0 +1,21 @@
+#    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.
+
+from novaclient.tests.functional.v2.legacy import test_hypervisors
+
+
+class TestHypervisorsV28(test_hypervisors.TestHypervisors):
+
+    COMPUTE_API_VERSION = "2.28"
+
+    def test_list(self):
+        self._test_list(dict)
diff --git a/novaclient/tests/unit/v2/test_shell.py b/novaclient/tests/unit/v2/test_shell.py
index 3ddd72449..4d936ede8 100644
--- a/novaclient/tests/unit/v2/test_shell.py
+++ b/novaclient/tests/unit/v2/test_shell.py
@@ -2792,6 +2792,7 @@ class ShellTest(utils.TestCase):
             27,  # NOTE(cdent): 27 adds support for updated microversion
                  #   headers, and is tested in test_api_versions, but is
                  #   not explicitly tested via wraps and _SUBSTITUTIONS.
+            28,  # doesn't require any changes in novaclient
         ])
         versions_supported = set(range(0,
                                  novaclient.API_MAX_VERSION.ver_minor + 1))
diff --git a/releasenotes/notes/microversion-v2_28-abf653ae5cf5c4a9.yaml b/releasenotes/notes/microversion-v2_28-abf653ae5cf5c4a9.yaml
new file mode 100644
index 000000000..064f23cc9
--- /dev/null
+++ b/releasenotes/notes/microversion-v2_28-abf653ae5cf5c4a9.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+- Support v2.28 microversion
+- cpu_info property of hypervisor resource is a json now (previously it was
+  text).