diff --git a/collectd_ceilometer/ceilometer/sender.py b/collectd_ceilometer/ceilometer/sender.py
index a7c1c95..a4315b7 100644
--- a/collectd_ceilometer/ceilometer/sender.py
+++ b/collectd_ceilometer/ceilometer/sender.py
@@ -22,7 +22,6 @@ import threading
 import requests
 import six
 
-from collectd_ceilometer.common.keystone_light import ClientV2
 from collectd_ceilometer.common.keystone_light import ClientV3
 from collectd_ceilometer.common.keystone_light import KeystoneException
 from collectd_ceilometer.common.settings import Config
@@ -78,20 +77,12 @@ class Sender(object):
                 # create a keystone client if it doesn't exist
                 if self._keystone is None:
                     cfg = Config.instance()
-                    if cfg.OS_IDENTITY_API_VERSION == "2.0":
-                        self._keystone = ClientV2(
-                            auth_url=cfg.OS_AUTH_URL,
-                            username=cfg.OS_USERNAME,
-                            password=cfg.OS_PASSWORD,
-                            tenant_name=cfg.OS_TENANT_NAME
-                        )
-                    else:
-                        self._keystone = ClientV3(
-                            auth_url=cfg.OS_AUTH_URL,
-                            username=cfg.OS_USERNAME,
-                            password=cfg.OS_PASSWORD,
-                            tenant_name=cfg.OS_TENANT_NAME
-                        )
+                    self._keystone = ClientV3(
+                        auth_url=cfg.OS_AUTH_URL,
+                        username=cfg.OS_USERNAME,
+                        password=cfg.OS_PASSWORD,
+                        tenant_name=cfg.OS_TENANT_NAME
+                    )
                 # store the authentication token
                 self._auth_token = self._keystone.auth_token
 
diff --git a/collectd_ceilometer/common/keystone_light.py b/collectd_ceilometer/common/keystone_light.py
index a65ce32..3f3c095 100644
--- a/collectd_ceilometer/common/keystone_light.py
+++ b/collectd_ceilometer/common/keystone_light.py
@@ -145,114 +145,6 @@ class ClientV3(object):
                                   e, self._services)
 
 
-class ClientV2(object):
-    """Light weight client for the OpenStack Identity API V2.
-
-    :param string username: Username for authentication. (optional)
-    :param string password: Password for authentication.
-    :param string tenant_name: Tenant name. (optional)
-    :param string auth_url: Keystone service endpoint for authorization.
-
-    """
-
-    def __init__(self, auth_url, username, password, tenant_name):
-        """Initialize a new client"""
-
-        self.auth_url = auth_url
-        self.username = username
-        self.password = password
-        self.tenant_name = tenant_name
-        self._auth_token = None
-        self._services = None
-
-    @property
-    def auth_token(self):
-        """Return token string usable for X-Auth-Token """
-        # actualize token
-        self.refresh()
-        return self._auth_token
-
-    @property
-    def services(self):
-        """Return list of services retrieved from identity server """
-        return self._services
-
-    def _get_auth_data(self, headers=None):
-        """Prepare auth data for request """
-
-        auth = {'password': self.password}
-
-        if self.username:
-            auth['username'] = self.username
-
-        return {'passwordCredentials': auth}
-
-    def _request_identity_data(self):
-        """Will send (POST) and retrieve data from identity server """
-
-        headers = {'Accept': 'application/json'}
-        url = self.auth_url.rstrip('/') + '/tokens'
-        params = {'auth': self._get_auth_data(headers)}
-
-        if self.tenant_name:
-            params['auth']['tenantName'] = self.tenant_name
-
-        resp = requests.post(url, json=params, headers=headers)
-        try:
-            resp.raise_for_status()
-            resp_data = resp.json()['access']
-        except (KeyError, ValueError, requests.exceptions.HTTPError) as e:
-            raise InvalidResponse(e, resp)
-
-        return resp_data
-
-    def refresh(self):
-        """Refresh token and services list (getting it from identity server) """
-        resp_data = self._request_identity_data()
-
-        try:
-            self._services = resp_data['serviceCatalog']
-            token = resp_data['token']
-
-            self._auth_token = token['id']
-        except (TypeError, KeyError, ValueError) as e:
-            raise InvalidResponse(e, resp_data)
-
-        return resp_data
-
-    def get_service_endpoint(self, name, urlkey="internalURL", region=None):
-        """Return url endpoint of service
-
-        possible values of urlkey = 'adminURL' | 'publicURL' | 'internalURL'
-        provide region if more endpoints are available
-        """
-        endpoints = None
-
-        try:
-            for service in self._services:
-                if service['name'] == name:
-                    endpoints = service['endpoints']
-                    break
-
-            if not endpoints:
-                raise MissingServices("Missing name '%s' in received services"
-                                      % name,
-                                      None, self._services)
-
-            # preselect default
-            endpoint = endpoints[0]
-
-            if region:
-                for ep in endpoints:
-                    if ep['region'] == region:
-                        endpoint = ep
-                        break
-
-            return endpoint[urlkey].rstrip('/')
-        except (KeyError, ValueError) as e:
-            raise MissingServices("Missing data in received services",
-                                  e, self._services)
-
 """
 Example of response (part only)
 {
diff --git a/collectd_ceilometer/tests/common/test_keystone_light.py b/collectd_ceilometer/tests/common/test_keystone_light.py
index 92b2f20..41c7f3d 100644
--- a/collectd_ceilometer/tests/common/test_keystone_light.py
+++ b/collectd_ceilometer/tests/common/test_keystone_light.py
@@ -19,7 +19,6 @@
 from __future__ import unicode_literals
 
 from collectd_ceilometer import keystone_light
-from collectd_ceilometer.keystone_light import ClientV2
 from collectd_ceilometer.keystone_light import ClientV3
 from collectd_ceilometer.keystone_light import MissingServices
 import mock
@@ -350,200 +349,3 @@ class KeystoneLightTestV3(unittest.TestCase):
 
         with self.assertRaises(keystone_light.InvalidResponse):
             client.refresh()
-
-
-class KeystoneLightTestV2(unittest.TestCase):
-    """Test the keystone light client with 2.0 keystone api"""
-
-    def setUp(self):
-        super(KeystoneLightTestV2, self).setUp()
-
-        self.test_authtoken = "c5bbb1c9a27e470fb482de2a718e08c2"
-        self.test_public_endpoint = "http://public_endpoint"
-        self.test_internal_endpoint = "http://iternal_endpoint"
-        self.test_region = "RegionOne"
-
-        response = {'access': {
-            "token": {
-                "issued_at": "2015-09-04T08:59:09.991646",
-                "expires": "2015-09-04T09:59:09Z",
-                "id": self.test_authtoken,
-                "tenant": {
-                    "enabled": True,
-                    "description": None,
-                    "name": "service",
-                    "id": "fdeec62f6c794c8dbfda448a83de9ce2"
-                },
-                "audit_ids": [
-                    "Pig7hVfGQjSuUnt1Hc5mCg"
-                ]
-            },
-            "serviceCatalog": [{
-                "endpoints_links": [],
-                "endpoints": [{
-                    "adminURL": "http://10.237.214.74:8777/",
-                    "region": self.test_region,
-                    "publicURL": self.test_public_endpoint + '/',
-                    "internalURL": self.test_internal_endpoint,
-                    "id": "ac95b1a24a854ec7a4b63b08ed4cbd83"
-                }],
-                "type": "metering",
-                "name": "ceilometer"
-            }, ],
-        }}
-
-        self.mock_response = mock.Mock()
-        self.mock_response.json.return_value = response
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_refresh(self, mock_post):
-        """Test refresh"""
-
-        mock_post.return_value = self.mock_response
-
-        client = ClientV2("test_auth_url", "test_username",
-                          "test_password", "test_tenant")
-        client.refresh()
-
-        self.assertEqual(mock_post.call_count, 1)
-        self.assertEqual(client.auth_token, self.test_authtoken)
-
-        expected_args = {
-            'headers': {'Accept': 'application/json'},
-            'json': {
-                'auth': {
-                    'tenantName': u'test_tenant',
-                    'passwordCredentials': {
-                        'username': u'test_username',
-                        'password': u'test_password'
-                    }
-                }
-            }
-        }
-
-        self.assertEqual(mock_post.call_args[0], (u'test_auth_url/tokens',))
-        self.assertEqual(mock_post.call_args[1], expected_args)
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_getservice_endpoint(self, mock_post):
-        """Test getservice endpoint"""
-
-        mock_post.return_value = self.mock_response
-
-        client = ClientV2("test_auth_url", "test_username",
-                          "test_password", "test_tenant")
-        client.refresh()
-
-        endpoint = client.get_service_endpoint('ceilometer')
-        self.assertEqual(endpoint, self.test_internal_endpoint)
-
-        endpoint = client.get_service_endpoint('ceilometer', 'publicURL')
-        self.assertEqual(endpoint, self.test_public_endpoint)
-
-        endpoint = client.get_service_endpoint('ceilometer', 'publicURL',
-                                               self.test_region)
-        self.assertEqual(endpoint, self.test_public_endpoint)
-
-        with self.assertRaises(MissingServices):
-            client.get_service_endpoint('badname')
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_getservice_endpoint_error(self, mock_post):
-        """Test getservice endpoint error"""
-
-        response = {'access': {
-            "token": {
-                "id": "authtoken",
-            },
-            "serviceCatalog": [{
-                "endpoints_links": [],
-                "endpoints": [],
-                "type": "metering",
-                "missingname": "ceilometer"
-            },
-            ],
-        }}
-
-        self.mock_response = mock.Mock()
-        self.mock_response.json.return_value = response
-
-        mock_post.return_value = self.mock_response
-
-        client = ClientV2("test_auth_url", "test_username",
-                          "test_password", "test_tenant")
-        client.refresh()
-
-        with self.assertRaises(MissingServices):
-            client.get_service_endpoint('ceilometer')
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_invalidresponse_missing_access(self, mock_post):
-        """Test invalid response: missing access"""
-
-        response = {'badresponse': None}
-
-        mock_response = mock.Mock()
-        mock_response.json.return_value = response
-        mock_post.return_value = mock_response
-
-        client = keystone_light.ClientV2("test_auth_url", "test_username",
-                                         "test_password", "test_tenant")
-
-        with self.assertRaises(keystone_light.InvalidResponse):
-            client.refresh()
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_invalidresponse_missing_servicecatalog(self, mock_post):
-        """Test invalid response: missing servicecatalog"""
-
-        response = {'access': {
-            'token': None
-            }
-        }
-
-        mock_response = mock.Mock()
-        mock_response.json.return_value = response
-        mock_post.return_value = mock_response
-
-        client = keystone_light.ClientV2("test_auth_url", "test_username",
-                                         "test_password", "test_tenant")
-
-        with self.assertRaises(keystone_light.InvalidResponse):
-            client.refresh()
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_invalidresponse_missing_token(self, mock_post):
-        """Test invalid response: missing token"""
-
-        response = {'access': {
-            "serviceCatalog": []
-        }}
-
-        mock_response = mock.Mock()
-        mock_response.json.return_value = response
-        mock_post.return_value = mock_response
-
-        client = keystone_light.ClientV2("test_auth_url", "test_username",
-                                         "test_password", "test_tenant")
-
-        with self.assertRaises(keystone_light.InvalidResponse):
-            client.refresh()
-
-    @mock.patch('collectd_ceilometer.common.keystone_light.requests.post')
-    def test_invalidresponse_missing_id(self, mock_post):
-        """Test  invalid response: missing id"""
-
-        response = {'access': {
-            "serviceCatalog": [],
-            "token": None
-        }, }
-
-        mock_response = mock.Mock()
-        mock_response.json.return_value = response
-        mock_post.return_value = mock_response
-
-        client = keystone_light.ClientV2("test_auth_url", "test_username",
-                                         "test_password", "test_tenant")
-
-        with self.assertRaises(keystone_light.InvalidResponse):
-            client.refresh()
diff --git a/doc/source/usage.rst b/doc/source/usage.rst
index 92c9093..45174bc 100644
--- a/doc/source/usage.rst
+++ b/doc/source/usage.rst
@@ -59,3 +59,26 @@ COLLECTD_LOG_LEVEL
     (debug|info|notice|warning|err) All log messages with lower log level than
     this are going to be filtered out from the log file.
     Default: info
+
+Authenticating using Identity Server API v3
+===========================================
+
+following environment variables are used in this plugin for authentication
+to Keystone API v3
+
+OS_IDENTITY_API_VERSION
+    specifies version of keystone API used, should be set to 3 as 2.0 is
+    deprecated.
+    Default: 3
+
+OS_AUTH_URL
+    url where keystone is listening
+    Default: based on $KEYSTONE_AUTH_URI/v$IDENTITY_API_VERSION
+
+OS_PASSWORD
+    password for service tenant used for keystone authentication
+    Default: based on $SERVICE_PASSWORD
+
+OS_TENANT_NAME
+    name of service tenant used for keystone authentication
+    Default: based on $SERVICE_TENANT_NAME
diff --git a/releasenotes/notes/keystone-api-version-91dbfd93e93562d2.yaml b/releasenotes/notes/keystone-api-version-91dbfd93e93562d2.yaml
new file mode 100644
index 0000000..fd34aee
--- /dev/null
+++ b/releasenotes/notes/keystone-api-version-91dbfd93e93562d2.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - Added support for Keystone V3 API.
+upgrade:
+  - Removed Keystone V2 support.