diff --git a/keystoneclient/httpclient.py b/keystoneclient/httpclient.py
index 5392557f9..9d0b77df5 100644
--- a/keystoneclient/httpclient.py
+++ b/keystoneclient/httpclient.py
@@ -34,11 +34,6 @@ except ImportError:
     keyring = None
     pickle = None
 
-try:
-    import json
-except ImportError:
-    import simplejson as json
-
 # Python 2.5 compat fix
 if not hasattr(urlparse, 'parse_qsl'):
     import cgi
@@ -47,6 +42,7 @@ if not hasattr(urlparse, 'parse_qsl'):
 
 from keystoneclient import access
 from keystoneclient import exceptions
+from keystoneclient.openstack.common import jsonutils
 
 
 _logger = logging.getLogger(__name__)
@@ -587,7 +583,7 @@ class HTTPClient(object):
         raise NotImplementedError
 
     def serialize(self, entity):
-        return json.dumps(entity)
+        return jsonutils.dumps(entity)
 
     @property
     def service_catalog(self):
@@ -623,7 +619,7 @@ class HTTPClient(object):
 
         if resp.text:
             try:
-                body_resp = json.loads(resp.text)
+                body_resp = jsonutils.loads(resp.text)
             except (ValueError, TypeError):
                 body_resp = None
                 _logger.debug("Could not decode JSON from body: %s"
diff --git a/keystoneclient/middleware/auth_token.py b/keystoneclient/middleware/auth_token.py
index aad102610..6dc7c931d 100644
--- a/keystoneclient/middleware/auth_token.py
+++ b/keystoneclient/middleware/auth_token.py
@@ -146,7 +146,6 @@ keystone.token_info
 
 import datetime
 import httplib
-import json
 import logging
 import os
 import stat
@@ -783,7 +782,7 @@ class AuthProtocol(object):
                 return cached
             if cms.is_ans1_token(user_token):
                 verified = self.verify_signed_token(user_token)
-                data = json.loads(verified)
+                data = jsonutils.loads(verified)
             else:
                 data = self.verify_uuid_token(user_token, retry)
             expires = self._confirm_token_not_expired(data)
@@ -973,8 +972,8 @@ class AuthProtocol(object):
 
             # Note that 'invalid' and (data, expires) are the only
             # valid types of serialized cache entries, so there is not
-            # a collision with json.loads(serialized) == None.
-            cached = json.loads(serialized)
+            # a collision with jsonutils.loads(serialized) == None.
+            cached = jsonutils.loads(serialized)
             if cached == 'invalid':
                 self.LOG.debug('Cached Token %s is marked unauthorized',
                                token_id)
@@ -993,7 +992,7 @@ class AuthProtocol(object):
         data may be the string 'invalid' or a tuple like (data, expires)
 
         """
-        serialized_data = json.dumps(data)
+        serialized_data = jsonutils.dumps(data)
         if self._memcache_security_strategy is None:
             cache_key = CACHE_KEY_TEMPLATE % token_id
             data_to_store = serialized_data
diff --git a/keystoneclient/v3/client.py b/keystoneclient/v3/client.py
index 3c60abad1..5de064a43 100644
--- a/keystoneclient/v3/client.py
+++ b/keystoneclient/v3/client.py
@@ -12,11 +12,11 @@
 #    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 json
 import logging
 
 from keystoneclient import exceptions
 from keystoneclient import httpclient
+from keystoneclient.openstack.common import jsonutils
 from keystoneclient.v3.contrib import trusts
 from keystoneclient.v3 import credentials
 from keystoneclient.v3 import domains
@@ -104,7 +104,7 @@ class Client(httpclient.HTTPClient):
             self.authenticate()
 
     def serialize(self, entity):
-        return json.dumps(entity, sort_keys=True)
+        return jsonutils.dumps(entity, sort_keys=True)
 
     def process_token(self):
         """Extract and process information from the new auth_ref.