diff --git a/oauth2client/anyjson.py b/oauth2client/anyjson.py
deleted file mode 100644
index ae21c33..0000000
--- a/oauth2client/anyjson.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# Copyright (C) 2010 Google Inc.
-#
-# 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.
-
-"""Utility module to import a JSON module
-
-Hides all the messy details of exactly where
-we get a simplejson module from.
-"""
-
-__author__ = 'jcgregorio@google.com (Joe Gregorio)'
-
-
-try: # pragma: no cover
-  # Should work for Python2.6 and higher.
-  import json as simplejson
-except ImportError: # pragma: no cover
-  try:
-    import simplejson
-  except ImportError:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
diff --git a/oauth2client/appengine.py b/oauth2client/appengine.py
index 0aaa877..b284ad7 100644
--- a/oauth2client/appengine.py
+++ b/oauth2client/appengine.py
@@ -22,6 +22,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 import base64
 import cgi
 import httplib2
+import json
 import logging
 import os
 import pickle
@@ -41,7 +42,6 @@ from oauth2client import GOOGLE_TOKEN_URI
 from oauth2client import clientsecrets
 from oauth2client import util
 from oauth2client import xsrfutil
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AccessTokenRefreshError
 from oauth2client.client import AssertionCredentials
 from oauth2client.client import Credentials
@@ -172,7 +172,7 @@ class AppAssertionCredentials(AssertionCredentials):
 
   @classmethod
   def from_json(cls, json):
-    data = simplejson.loads(json)
+    data = json.loads(json)
     return AppAssertionCredentials(data['scope'])
 
   def _refresh(self, http_request):
@@ -882,7 +882,7 @@ class OAuth2Decorator(object):
                                             user)
 
           if decorator._token_response_param and credentials.token_response:
-            resp_json = simplejson.dumps(credentials.token_response)
+            resp_json = json.dumps(credentials.token_response)
             redirect_uri = util._add_query_parameter(
                 redirect_uri, decorator._token_response_param, resp_json)
 
diff --git a/oauth2client/client.py b/oauth2client/client.py
index 8b72156..648e22f 100644
--- a/oauth2client/client.py
+++ b/oauth2client/client.py
@@ -24,6 +24,7 @@ import clientsecrets
 import copy
 import datetime
 import httplib2
+import json
 import logging
 import os
 import sys
@@ -36,7 +37,6 @@ from oauth2client import GOOGLE_AUTH_URI
 from oauth2client import GOOGLE_REVOKE_URI
 from oauth2client import GOOGLE_TOKEN_URI
 from oauth2client import util
-from oauth2client.anyjson import simplejson
 
 HAS_OPENSSL = False
 HAS_CRYPTO = False
@@ -210,7 +210,7 @@ class Credentials(object):
     # Add in information we will need later to reconsistitue this instance.
     d['_class'] = t.__name__
     d['_module'] = t.__module__
-    return simplejson.dumps(d)
+    return json.dumps(d)
 
   def to_json(self):
     """Creating a JSON representation of an instance of Credentials.
@@ -233,7 +233,7 @@ class Credentials(object):
       An instance of the subclass of Credentials that was serialized with
       to_json().
     """
-    data = simplejson.loads(s)
+    data = json.loads(s)
     # Find and call the right classmethod from_json() to restore the object.
     module = data['_module']
     try:
@@ -568,7 +568,7 @@ class OAuth2Credentials(Credentials):
     Returns:
       An instance of a Credentials subclass.
     """
-    data = simplejson.loads(s)
+    data = json.loads(s)
     if 'token_expiry' in data and not isinstance(data['token_expiry'],
         datetime.datetime):
       try:
@@ -736,7 +736,7 @@ class OAuth2Credentials(Credentials):
         self.token_uri, method='POST', body=body, headers=headers)
     if resp.status == 200:
       # TODO(jcgregorio) Raise an error if loads fails?
-      d = simplejson.loads(content)
+      d = json.loads(content)
       self.token_response = d
       self.access_token = d['access_token']
       self.refresh_token = d.get('refresh_token', self.refresh_token)
@@ -756,7 +756,7 @@ class OAuth2Credentials(Credentials):
       logger.info('Failed to retrieve access token: %s' % content)
       error_msg = 'Invalid response %s.' % resp['status']
       try:
-        d = simplejson.loads(content)
+        d = json.loads(content)
         if 'error' in d:
           error_msg = d['error']
           self.invalid = True
@@ -796,7 +796,7 @@ class OAuth2Credentials(Credentials):
     else:
       error_msg = 'Invalid response %s.' % resp.status
       try:
-        d = simplejson.loads(content)
+        d = json.loads(content)
         if 'error' in d:
           error_msg = d['error']
       except StandardError:
@@ -857,7 +857,7 @@ class AccessTokenCredentials(OAuth2Credentials):
 
   @classmethod
   def from_json(cls, s):
-    data = simplejson.loads(s)
+    data = json.loads(s)
     retval = AccessTokenCredentials(
         data['access_token'],
         data['user_agent'])
@@ -1102,7 +1102,7 @@ def save_to_well_known_file(credentials, well_known_file=None):
   credentials_data = credentials.serialization_data
 
   with open(well_known_file, 'w') as f:
-    simplejson.dump(credentials_data, f, sort_keys=True, indent=2)
+    json.dump(credentials_data, f, sort_keys=True, indent=2)
 
 
 def _get_environment_variable_file():
@@ -1156,8 +1156,7 @@ def _get_application_default_credential_from_file(
   # read the credentials from the file
   with open(application_default_credential_filename) as (
       application_default_credential):
-    client_credentials = service_account.simplejson.load(
-        application_default_credential)
+    client_credentials = json.load(application_default_credential)
 
   credentials_type = client_credentials.get('type')
   if credentials_type == AUTHORIZED_USER:
@@ -1343,7 +1342,7 @@ if HAS_CRYPTO:
 
     @classmethod
     def from_json(cls, s):
-      data = simplejson.loads(s)
+      data = json.loads(s)
       retval = SignedJwtAssertionCredentials(
           data['service_account_name'],
           base64.b64decode(data['private_key']),
@@ -1406,7 +1405,7 @@ if HAS_CRYPTO:
     resp, content = http.request(cert_uri)
 
     if resp.status == 200:
-      certs = simplejson.loads(content)
+      certs = json.loads(content)
       return crypt.verify_signed_jwt_with_certs(id_token, certs, audience)
     else:
       raise VerifyJwtTokenError('Status code: %d' % resp.status)
@@ -1436,7 +1435,7 @@ def _extract_id_token(id_token):
     raise VerifyJwtTokenError(
       'Wrong number of segments in token: %s' % id_token)
 
-  return simplejson.loads(_urlsafe_b64decode(segments[1]))
+  return json.loads(_urlsafe_b64decode(segments[1]))
 
 
 def _parse_exchange_token_response(content):
@@ -1454,7 +1453,7 @@ def _parse_exchange_token_response(content):
   """
   resp = {}
   try:
-    resp = simplejson.loads(content)
+    resp = json.loads(content)
   except StandardError:
     # different JSON libs raise different exceptions,
     # so we just do a catch-all here
diff --git a/oauth2client/clientsecrets.py b/oauth2client/clientsecrets.py
index ac99aae..ef958d9 100644
--- a/oauth2client/clientsecrets.py
+++ b/oauth2client/clientsecrets.py
@@ -20,8 +20,8 @@ an OAuth 2.0 protected service.
 
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
+import json
 
-from anyjson import simplejson
 
 # Properties that make a client_secrets.json file valid.
 TYPE_WEB = 'web'
@@ -87,12 +87,12 @@ def _validate_clientsecrets(obj):
 
 
 def load(fp):
-  obj = simplejson.load(fp)
+  obj = json.load(fp)
   return _validate_clientsecrets(obj)
 
 
 def loads(s):
-  obj = simplejson.loads(s)
+  obj = json.loads(s)
   return _validate_clientsecrets(obj)
 
 
@@ -100,7 +100,7 @@ def _loadfile(filename):
   try:
     fp = file(filename, 'r')
     try:
-      obj = simplejson.load(fp)
+      obj = json.load(fp)
     finally:
       fp.close()
   except IOError:
diff --git a/oauth2client/crypt.py b/oauth2client/crypt.py
index c70c95c..d0e48ef 100644
--- a/oauth2client/crypt.py
+++ b/oauth2client/crypt.py
@@ -17,11 +17,10 @@
 
 import base64
 import hashlib
+import json
 import logging
 import time
 
-from anyjson import simplejson
-
 
 CLOCK_SKEW_SECS = 300  # 5 minutes in seconds
 AUTH_TOKEN_LIFETIME_SECS = 300  # 5 minutes in seconds
@@ -287,7 +286,7 @@ def _urlsafe_b64decode(b64string):
 
 
 def _json_encode(data):
-  return simplejson.dumps(data, separators = (',', ':'))
+  return json.dumps(data, separators = (',', ':'))
 
 
 def make_signed_jwt(signer, payload):
@@ -347,7 +346,7 @@ def verify_signed_jwt_with_certs(jwt, certs, audience):
   # Parse token.
   json_body = _urlsafe_b64decode(segments[1])
   try:
-    parsed = simplejson.loads(json_body)
+    parsed = json.loads(json_body)
   except:
     raise AppIdentityError('Can\'t parse token: %s' % json_body)
 
diff --git a/oauth2client/file.py b/oauth2client/file.py
index 1895f94..776c2a6 100644
--- a/oauth2client/file.py
+++ b/oauth2client/file.py
@@ -24,7 +24,6 @@ import os
 import stat
 import threading
 
-from anyjson import simplejson
 from client import Storage as BaseStorage
 from client import Credentials
 
diff --git a/oauth2client/gce.py b/oauth2client/gce.py
index be8c528..509990e 100644
--- a/oauth2client/gce.py
+++ b/oauth2client/gce.py
@@ -20,11 +20,11 @@ Utilities for making it easier to use OAuth 2.0 on Google Compute Engine.
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import httplib2
+import json
 import logging
 import uritemplate
 
 from oauth2client import util
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AccessTokenRefreshError
 from oauth2client.client import AssertionCredentials
 
@@ -63,8 +63,8 @@ class AppAssertionCredentials(AssertionCredentials):
     super(AppAssertionCredentials, self).__init__(None)
 
   @classmethod
-  def from_json(cls, json):
-    data = simplejson.loads(json)
+  def from_json(cls, json_data):
+    data = json.loads(json_data)
     return AppAssertionCredentials(data['scope'])
 
   def _refresh(self, http_request):
@@ -83,7 +83,7 @@ class AppAssertionCredentials(AssertionCredentials):
     response, content = http_request(uri)
     if response.status == 200:
       try:
-        d = simplejson.loads(content)
+        d = json.loads(content)
       except StandardError as e:
         raise AccessTokenRefreshError(str(e))
       self.access_token = d['accessToken']
diff --git a/oauth2client/multistore_file.py b/oauth2client/multistore_file.py
index ce7a519..a5bf6c9 100644
--- a/oauth2client/multistore_file.py
+++ b/oauth2client/multistore_file.py
@@ -45,11 +45,11 @@ __author__ = 'jbeda@google.com (Joe Beda)'
 
 import base64
 import errno
+import json
 import logging
 import os
 import threading
 
-from anyjson import simplejson
 from oauth2client.client import Storage as BaseStorage
 from oauth2client.client import Credentials
 from oauth2client import util
@@ -315,7 +315,7 @@ class _MultiStore(object):
     """
     assert self._thread_lock.locked()
     self._file.file_handle().seek(0)
-    return simplejson.load(self._file.file_handle())
+    return json.load(self._file.file_handle())
 
   def _locked_json_write(self, data):
     """Write a JSON serializable data structure to the multistore.
@@ -329,7 +329,7 @@ class _MultiStore(object):
     if self._read_only:
       return
     self._file.file_handle().seek(0)
-    simplejson.dump(data, self._file.file_handle(), sort_keys=True, indent=2)
+    json.dump(data, self._file.file_handle(), sort_keys=True, indent=2)
     self._file.file_handle().truncate()
 
   def _refresh_data_cache(self):
@@ -387,7 +387,7 @@ class _MultiStore(object):
     raw_key = cred_entry['key']
     key = util.dict_to_tuple_key(raw_key)
     credential = None
-    credential = Credentials.new_from_json(simplejson.dumps(cred_entry['credential']))
+    credential = Credentials.new_from_json(json.dumps(cred_entry['credential']))
     return (key, credential)
 
   def _write(self):
@@ -400,7 +400,7 @@ class _MultiStore(object):
     raw_data['data'] = raw_creds
     for (cred_key, cred) in self._data.items():
       raw_key = dict(cred_key)
-      raw_cred = simplejson.loads(cred.to_json())
+      raw_cred = json.loads(cred.to_json())
       raw_creds.append({'key': raw_key, 'credential': raw_cred})
     self._locked_json_write(raw_data)
 
diff --git a/oauth2client/service_account.py b/oauth2client/service_account.py
index 6bd4bd1..feb5d33 100644
--- a/oauth2client/service_account.py
+++ b/oauth2client/service_account.py
@@ -18,6 +18,7 @@ This credentials class is implemented on top of rsa library.
 """
 
 import base64
+import json
 import rsa
 import time
 import types
@@ -25,7 +26,6 @@ import types
 from oauth2client import GOOGLE_REVOKE_URI
 from oauth2client import GOOGLE_TOKEN_URI
 from oauth2client import util
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AssertionCredentials
 
 from pyasn1.codec.ber import decoder
@@ -43,7 +43,7 @@ class _ServiceAccountCredentials(AssertionCredentials):
 
     super(_ServiceAccountCredentials, self).__init__(
         None, user_agent=user_agent, token_uri=token_uri, revoke_uri=revoke_uri)
-    
+
     self._service_account_id = service_account_id
     self._service_account_email = service_account_email
     self._private_key_id = private_key_id
@@ -118,8 +118,7 @@ class _ServiceAccountCredentials(AssertionCredentials):
 
 def _urlsafe_b64encode(data):
   return base64.urlsafe_b64encode(
-      simplejson.dumps(data, separators = (',', ':'))\
-          .encode('UTF-8')).rstrip('=')
+      json.dumps(data, separators=(',', ':')).encode('UTF-8')).rstrip('=')
 
 def _get_private_key(private_key_pkcs8_text):
   """Get an RSA private key object from a pkcs8 representation."""
diff --git a/setup.py b/setup.py
index 4e738fa..f01f401 100644
--- a/setup.py
+++ b/setup.py
@@ -17,6 +17,14 @@
 Also installs included versions of third party libraries, if those libraries
 are not already installed.
 """
+from __future__ import print_function
+
+import sys
+
+if sys.version_info <= (2, 6):
+  print('oauth2client requires python version >= 2.6.', file=sys.stderr)
+  sys.exit(1)
+
 from setuptools import setup
 
 packages = [
@@ -31,18 +39,6 @@ install_requires = [
     'rsa==3.1.4',
 ]
 
-needs_json = False
-try:
-  import json
-except ImportError:
-  try:
-    import simplejson
-  except ImportError:
-    needs_json = True
-
-if needs_json:
-  install_requires.append('simplejson')
-
 long_desc = """The oauth2client is a client library for OAuth 2.0."""
 
 import oauth2client
diff --git a/tests/http_mock.py b/tests/http_mock.py
index cbf35a9..57b5f15 100644
--- a/tests/http_mock.py
+++ b/tests/http_mock.py
@@ -14,9 +14,9 @@
 
 """Copy of googleapiclient.http's mock functionality."""
 
-import httplib2
+import json
 
-from oauth2client.anyjson import simplejson
+import httplib2
 
 # TODO(craigcitro): Find a cleaner way to share this code with googleapiclient.
 
@@ -101,7 +101,7 @@ class HttpMockSequence(object):
     if content == 'echo_request_headers':
       content = headers
     elif content == 'echo_request_headers_as_json':
-      content = simplejson.dumps(headers)
+      content = json.dumps(headers)
     elif content == 'echo_request_body':
       if hasattr(body, 'read'):
         content = body.read()
diff --git a/tests/test_appengine.py b/tests/test_appengine.py
index 579b30f..40fde6f 100644
--- a/tests/test_appengine.py
+++ b/tests/test_appengine.py
@@ -25,6 +25,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 import base64
 import datetime
 import httplib2
+import json
 import mox
 import os
 import time
@@ -53,7 +54,6 @@ from google.appengine.runtime import apiproxy_errors
 from http_mock import HttpMockSequence
 from oauth2client import appengine
 from oauth2client import GOOGLE_TOKEN_URI
-from oauth2client.anyjson import simplejson
 from oauth2client.clientsecrets import _loadfile
 from oauth2client.clientsecrets import InvalidClientSecretsError
 from oauth2client.appengine import AppAssertionCredentials
@@ -128,7 +128,7 @@ class Http2Mock(object):
   def request(self, token_uri, method, body, headers, *args, **kwargs):
     self.body = body
     self.headers = headers
-    return (self, simplejson.dumps(self.content))
+    return (self, json.dumps(self.content))
 
 
 class TestAppAssertionCredentials(unittest.TestCase):
@@ -309,7 +309,7 @@ class FlowNDBPropertyTest(unittest.TestCase):
 
 def _http_request(*args, **kwargs):
   resp = httplib2.Response({'status': '200'})
-  content = simplejson.dumps({'access_token': 'bar'})
+  content = json.dumps({'access_token': 'bar'})
 
   return resp, content
 
@@ -584,8 +584,7 @@ class DecoratorTests(unittest.TestCase):
     self.assertEqual(None, self.decorator.credentials)
     if self.decorator._token_response_param:
       response = parse_qs(parts[1])[self.decorator._token_response_param][0]
-      self.assertEqual(Http2Mock.content,
-                       simplejson.loads(urllib.unquote(response)))
+      self.assertEqual(Http2Mock.content, json.loads(urllib.unquote(response)))
     self.assertEqual(self.decorator.flow, self.decorator._tls.flow)
     self.assertEqual(self.decorator.credentials,
                      self.decorator._tls.credentials)
diff --git a/tests/test_file.py b/tests/test_file.py
index 1de82af..72f9e91 100644
--- a/tests/test_file.py
+++ b/tests/test_file.py
@@ -25,6 +25,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 import copy
 import datetime
 import httplib2
+import json
 import os
 import pickle
 import stat
@@ -37,7 +38,6 @@ from oauth2client import file
 from oauth2client import locked_file
 from oauth2client import multistore_file
 from oauth2client import util
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AccessTokenCredentials
 from oauth2client.client import AssertionCredentials
 from oauth2client.client import OAuth2Credentials
@@ -108,9 +108,8 @@ class OAuth2ClientFileTests(unittest.TestCase):
 
     # Now write it back out and confirm it has been rewritten as JSON
     s.put(credentials)
-    f = open(FILENAME)
-    data = simplejson.load(f)
-    f.close()
+    with open(FILENAME) as f:
+      data = json.load(f)
 
     self.assertEquals(data['access_token'], 'foo')
     self.assertEquals(data['_class'], 'OAuth2Credentials')
diff --git a/tests/test_jwt.py b/tests/test_jwt.py
index 8b17fea..8b94d40 100644
--- a/tests/test_jwt.py
+++ b/tests/test_jwt.py
@@ -37,7 +37,6 @@ except ImportError:
 
 from http_mock import HttpMockSequence
 from oauth2client import crypt
-from oauth2client.anyjson import simplejson
 from oauth2client.client import Credentials
 from oauth2client.client import SignedJwtAssertionCredentials
 from oauth2client.client import VerifyJwtTokenError
diff --git a/tests/test_oauth2client.py b/tests/test_oauth2client.py
index a4b56fd..d4a5613 100644
--- a/tests/test_oauth2client.py
+++ b/tests/test_oauth2client.py
@@ -24,6 +24,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import base64
 import datetime
+import json
 import mox
 import os
 import time
@@ -34,7 +35,6 @@ from http_mock import HttpMock
 from http_mock import HttpMockSequence
 from oauth2client import GOOGLE_REVOKE_URI
 from oauth2client import GOOGLE_TOKEN_URI
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AccessTokenCredentials
 from oauth2client.client import AccessTokenCredentialsError
 from oauth2client.client import AccessTokenRefreshError
@@ -277,7 +277,7 @@ class GoogleCredentialsTests(unittest.TestCase):
         os.path.join('gcloud', 'temp_well_known_file_service_account.json'))
     save_to_well_known_file(credentials, temp_credential_file)
     with open(temp_credential_file) as f:
-      d = simplejson.load(f)
+      d = json.load(f)
     self.assertEqual('service_account', d['type'])
     self.assertEqual('123', d['client_id'])
     self.assertEqual('dummy@google.com', d['client_email'])
@@ -302,7 +302,7 @@ class GoogleCredentialsTests(unittest.TestCase):
         os.path.join('gcloud', 'temp_well_known_file_authorized_user.json'))
     save_to_well_known_file(credentials, temp_credential_file)
     with open(temp_credential_file) as f:
-      d = simplejson.load(f)
+      d = json.load(f)
     self.assertEqual('authorized_user', d['type'])
     self.assertEqual('123', d['client_id'])
     self.assertEqual('secret', d['client_secret'])
@@ -541,7 +541,7 @@ class BasicCredentialsTests(unittest.TestCase):
       token_response = {'access_token': '1/3w', 'expires_in': 3600}
       http = HttpMockSequence([
           ({'status': status_code}, ''),
-          ({'status': '200'}, simplejson.dumps(token_response)),
+          ({'status': '200'}, json.dumps(token_response)),
           ({'status': '200'}, 'echo_request_headers'),
       ])
       http = self.credentials.authorize(http)
@@ -630,8 +630,8 @@ class BasicCredentialsTests(unittest.TestCase):
     token_response_first = {'access_token': 'first_token', 'expires_in': S}
     token_response_second = {'access_token': 'second_token', 'expires_in': S}
     http = HttpMockSequence([
-        ({'status': '200'}, simplejson.dumps(token_response_first)),
-        ({'status': '200'}, simplejson.dumps(token_response_second)),
+        ({'status': '200'}, json.dumps(token_response_first)),
+        ({'status': '200'}, json.dumps(token_response_second)),
     ])
 
     token = self.credentials.get_access_token(http=http)
@@ -763,7 +763,7 @@ class ExtractIdTokenTest(unittest.TestCase):
 
   def test_extract_success(self):
     body = {'foo': 'bar'}
-    payload = base64.urlsafe_b64encode(simplejson.dumps(body)).strip('=')
+    payload = base64.urlsafe_b64encode(json.dumps(body)).strip('=')
     jwt = 'stuff.' + payload + '.signature'
 
     extracted = _extract_id_token(jwt)
@@ -771,7 +771,7 @@ class ExtractIdTokenTest(unittest.TestCase):
 
   def test_extract_failure(self):
     body = {'foo': 'bar'}
-    payload = base64.urlsafe_b64encode(simplejson.dumps(body)).strip('=')
+    payload = base64.urlsafe_b64encode(json.dumps(body)).strip('=')
     jwt = 'stuff.' + payload
 
     self.assertRaises(VerifyJwtTokenError, _extract_id_token, jwt)
@@ -938,7 +938,7 @@ class OAuth2WebServerFlowTest(unittest.TestCase):
 
   def test_exchange_id_token(self):
     body = {'foo': 'bar'}
-    payload = base64.urlsafe_b64encode(simplejson.dumps(body)).strip('=')
+    payload = base64.urlsafe_b64encode(json.dumps(body)).strip('=')
     jwt = (base64.urlsafe_b64encode('stuff')+ '.' + payload + '.' +
            base64.urlsafe_b64encode('signature'))
 
@@ -973,7 +973,7 @@ class CredentialsFromCodeTests(unittest.TestCase):
 
   def test_exchange_code_for_token(self):
     token = 'asdfghjkl'
-    payload =simplejson.dumps({'access_token': token, 'expires_in': 3600})
+    payload = json.dumps({'access_token': token, 'expires_in': 3600})
     http = HttpMockSequence([
       ({'status': '200'}, payload),
     ])
diff --git a/tests/test_service_account.py b/tests/test_service_account.py
index 56313d3..3a7bd3c 100644
--- a/tests/test_service_account.py
+++ b/tests/test_service_account.py
@@ -20,13 +20,13 @@
 Unit tests for service account credentials implemented using RSA.
 """
 
+import json
 import os
 import rsa
 import time
 import unittest
 
 from http_mock import HttpMockSequence
-from oauth2client.anyjson import simplejson
 from oauth2client.service_account import _ServiceAccountCredentials
 
 
@@ -98,13 +98,13 @@ class ServiceAccountCredentialsTests(unittest.TestCase):
     token_response_first = {'access_token': 'first_token', 'expires_in': S}
     token_response_second = {'access_token': 'second_token', 'expires_in': S}
     http = HttpMockSequence([
-        ({'status': '200'}, simplejson.dumps(token_response_first)),
-        ({'status': '200'}, simplejson.dumps(token_response_second)),
+        ({'status': '200'}, json.dumps(token_response_first)),
+        ({'status': '200'}, json.dumps(token_response_second)),
     ])
 
     token = self.credentials.get_access_token(http=http)
     self.assertEqual('first_token', token.access_token)
-    self.assertEqual(S - 1, token.expires_in)  
+    self.assertEqual(S - 1, token.expires_in)
     self.assertFalse(self.credentials.access_token_expired)
     self.assertEqual(token_response_first, self.credentials.token_response)