diff --git a/novaclient/__init__.py b/novaclient/__init__.py
index c114e5b9c..6795d8827 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("2.60")
+API_MAX_VERSION = api_versions.APIVersion("2.61")
diff --git a/novaclient/tests/unit/fakes.py b/novaclient/tests/unit/fakes.py
index b2820a48a..a9447f71f 100644
--- a/novaclient/tests/unit/fakes.py
+++ b/novaclient/tests/unit/fakes.py
@@ -131,6 +131,19 @@ class FakeClient(object):
 
         self.client.callstack = []
 
+    def assert_not_called(self, method, url, body=None):
+        """Assert that an HTTP method was not called in the test.
+
+        :param method: HTTP method name which is expected not to be called
+        :param url: Expected request url not to be called with given method
+        :param body: Expected request body not to be called with given method
+                     and url. Default is None.
+        """
+        not_expected = (method, url, body)
+        for entry in self.client.callstack:
+            assert not_expected != entry[0:3], (
+                'API %s %s body=%s was called.' % not_expected)
+
     def clear_callstack(self):
         self.client.callstack = []
 
diff --git a/novaclient/tests/unit/v2/fakes.py b/novaclient/tests/unit/v2/fakes.py
index e853ef223..7b905b9eb 100644
--- a/novaclient/tests/unit/v2/fakes.py
+++ b/novaclient/tests/unit/v2/fakes.py
@@ -837,6 +837,8 @@ class FakeSessionClient(base_client.SessionClient):
         included_fields = ['id', 'name']
         if self.api_version >= api_versions.APIVersion('2.55'):
             included_fields.append('description')
+        if self.api_version >= api_versions.APIVersion('2.61'):
+            included_fields.append('extra_specs')
         for flavor in flavors['flavors']:
             for k in list(flavor):
                 if k not in included_fields:
@@ -897,6 +899,11 @@ class FakeSessionClient(base_client.SessionClient):
             new_flavor['description'] = 'test description'
             flavors['flavors'].append(new_flavor)
 
+        # Add extra_specs in the response for all flavors.
+        if self.api_version >= api_versions.APIVersion('2.61'):
+            for flavor in flavors['flavors']:
+                flavor['extra_specs'] = {'test': 'value'}
+
         return (200, FAKE_RESPONSE_HEADERS, flavors)
 
     def get_flavors_1(self, **kw):
diff --git a/novaclient/tests/unit/v2/test_shell.py b/novaclient/tests/unit/v2/test_shell.py
index df646691e..997063416 100644
--- a/novaclient/tests/unit/v2/test_shell.py
+++ b/novaclient/tests/unit/v2/test_shell.py
@@ -104,6 +104,9 @@ class ShellTest(utils.TestCase):
     def assert_called_anytime(self, method, url, body=None):
         return self.shell.cs.assert_called_anytime(method, url, body)
 
+    def assert_not_called(self, method, url, body=None):
+        return self.shell.cs.assert_not_called(method, url, body)
+
     def test_agents_list_with_hypervisor(self):
         self.run_command('agent-list --hypervisor xen')
         self.assert_called('GET', '/os-agents?hypervisor=xen')
@@ -1168,6 +1171,16 @@ class ShellTest(utils.TestCase):
         self.assert_called('GET', '/flavors/aa1/os-extra_specs')
         self.assert_called_anytime('GET', '/flavors/detail')
 
+    def test_flavor_list_with_extra_specs_2_61_or_later(self):
+        """Tests that the 'os-extra_specs' API is not called
+        when the '--extra-specs' option is specified since microversion 2.61.
+        """
+        out, _ = self.run_command('flavor-list --extra-specs',
+                                  api_version='2.61')
+        self.assert_not_called('GET', '/flavors/aa1/os-extra_specs')
+        self.assert_called_anytime('GET', '/flavors/detail')
+        self.assertIn('extra_specs', out)
+
     def test_flavor_list_with_all(self):
         self.run_command('flavor-list --all')
         self.assert_called('GET', '/flavors/detail?is_public=None')
@@ -1196,9 +1209,17 @@ class ShellTest(utils.TestCase):
     def test_flavor_show_with_description(self):
         """Tests that the description is shown in version >= 2.55."""
         out, _ = self.run_command('flavor-show 1', api_version='2.55')
-        self.assert_called_anytime('GET', '/flavors/1')
+        self.assert_called('GET', '/flavors/1', pos=-2)
+        self.assert_called('GET', '/flavors/1/os-extra_specs', pos=-1)
         self.assertIn('description', out)
 
+    def test_flavor_show_2_61_or_later(self):
+        """Tests that the 'os-extra_specs' is not called in version >= 2.61."""
+        out, _ = self.run_command('flavor-show 1', api_version='2.61')
+        self.assert_not_called('GET', '/flavors/1/os-extra_specs')
+        self.assert_called_anytime('GET', '/flavors/1')
+        self.assertIn('extra_specs', out)
+
     def test_flavor_show_with_alphanum_id(self):
         self.run_command('flavor-show aa1')
         self.assert_called_anytime('GET', '/flavors/aa1')
@@ -3612,6 +3633,7 @@ class ShellTest(utils.TestCase):
             54,  # There are no version-wrapped shell method changes for this.
             57,  # There are no version-wrapped shell method changes for this.
             60,  # There are no client-side changes for volume multiattach.
+            61,  # There are no version-wrapped shell method changes for this.
         ])
         versions_supported = set(range(0,
                                  novaclient.API_MAX_VERSION.ver_minor + 1))
diff --git a/novaclient/v2/shell.py b/novaclient/v2/shell.py
index 4801cfcf8..d53fc05bc 100644
--- a/novaclient/v2/shell.py
+++ b/novaclient/v2/shell.py
@@ -1016,11 +1016,13 @@ def _print_flavor_list(cs, flavors, show_extra_specs=False):
         'Is_Public',
     ]
 
+    formatters = {}
     if show_extra_specs:
-        formatters = {'extra_specs': _print_flavor_extra_specs}
+        # Starting with microversion 2.61, extra specs are included
+        # in the flavor details response.
+        if cs.api_version < api_versions.APIVersion('2.61'):
+            formatters = {'extra_specs': _print_flavor_extra_specs}
         headers.append('extra_specs')
-    else:
-        formatters = {}
 
     if cs.api_version >= api_versions.APIVersion('2.55'):
         headers.append('Description')
@@ -1316,7 +1318,10 @@ def _print_flavor(flavor):
     info = flavor.to_dict()
     # ignore links, we don't need to present those
     info.pop('links')
-    info.update({"extra_specs": _print_flavor_extra_specs(flavor)})
+    # Starting with microversion 2.61, extra specs are included
+    # in the flavor details response.
+    if 'extra_specs' not in info:
+        info.update({"extra_specs": _print_flavor_extra_specs(flavor)})
     utils.print_dict(info)
 
 
diff --git a/releasenotes/notes/microversion-v2_61-9a8faa02fddf9ed6.yaml b/releasenotes/notes/microversion-v2_61-9a8faa02fddf9ed6.yaml
new file mode 100644
index 000000000..a96b65d3a
--- /dev/null
+++ b/releasenotes/notes/microversion-v2_61-9a8faa02fddf9ed6.yaml
@@ -0,0 +1,13 @@
+---
+other:
+  - |
+    Starting from microversion 2.61, the responses of the 'Flavor' APIs
+    include the 'extra_specs' parameter. Therefore 'Flavors extra-specs'
+    (os-extra_specs) API calls have been removed in the following commands
+    since microversion 2.61.
+
+    * ``nova flavor-list``
+    * ``nova flavor-show``
+
+    There are no behavior changes in the CLI. This is just a performance
+    optimization.