diff --git a/oslo_serialization/jsonutils.py b/oslo_serialization/jsonutils.py
index 5bd1f43..0e758c3 100644
--- a/oslo_serialization/jsonutils.py
+++ b/oslo_serialization/jsonutils.py
@@ -34,27 +34,9 @@ import datetime
 import functools
 import inspect
 import itertools
-import sys
+import json
 import uuid
 
-is_simplejson = False
-if sys.version_info < (2, 7):
-    # On Python <= 2.6, json module is not C boosted, so try to use
-    # simplejson module if available
-    try:
-        import simplejson as json
-        # NOTE(mriedem): Make sure we have a new enough version of simplejson
-        # to support the namedobject_as_tuple argument. This can be removed
-        # in the Kilo release when python 2.6 support is dropped.
-        if 'namedtuple_as_object' in inspect.getargspec(json.dumps).args:
-            is_simplejson = True
-        else:
-            import json
-    except ImportError:
-        import json
-else:
-    import json
-
 from oslo_utils import encodeutils
 from oslo_utils import importutils
 from oslo_utils import timeutils
@@ -193,8 +175,6 @@ def dumps(obj, default=to_primitive, **kwargs):
     Use dump_as_bytes() to ensure that the result type is ``bytes`` on Python 2
     and Python 3.
     """
-    if is_simplejson:
-        kwargs['namedtuple_as_object'] = False
     return json.dumps(obj, default=default, **kwargs)
 
 
@@ -234,8 +214,6 @@ def dump(obj, fp, *args, **kwargs):
        The *default* parameter now uses :func:`to_primitive` by default.
     """
     default = kwargs.get('default', to_primitive)
-    if is_simplejson:
-        kwargs['namedtuple_as_object'] = False
     return json.dump(obj, fp, default=default, *args, **kwargs)
 
 
diff --git a/oslo_serialization/tests/test_jsonutils.py b/oslo_serialization/tests/test_jsonutils.py
index 5dc21c5..6e0fd3f 100644
--- a/oslo_serialization/tests/test_jsonutils.py
+++ b/oslo_serialization/tests/test_jsonutils.py
@@ -21,7 +21,6 @@ import mock
 import netaddr
 from oslo_i18n import fixture
 from oslotest import base as test_base
-import simplejson
 import six
 import six.moves.xmlrpc_client as xmlrpclib
 
@@ -36,7 +35,7 @@ class JSONUtilsTestMixin(object):
         super(JSONUtilsTestMixin, self).setUp()
         self.json_patcher = mock.patch.multiple(
             jsonutils, json=self.json_impl,
-            is_simplejson=self.json_impl is simplejson)
+        )
         self.json_impl_mock = self.json_patcher.start()
 
     def tearDown(self):
@@ -108,10 +107,6 @@ class JSONUtilsTestJson(JSONUtilsTestMixin, test_base.BaseTestCase):
     json_impl = json
 
 
-class JSONUtilsTestSimpleJson(JSONUtilsTestMixin, test_base.BaseTestCase):
-    json_impl = simplejson
-
-
 class ToPrimitiveTestCase(test_base.BaseTestCase):
     def setUp(self):
         super(ToPrimitiveTestCase, self).setUp()
diff --git a/test-requirements.txt b/test-requirements.txt
index ce89cff..037edd8 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -10,6 +10,5 @@ sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 oslosphinx!=3.4.0,>=2.5.0 # Apache-2.0
 
 oslotest>=1.10.0 # Apache-2.0
-simplejson>=2.2.0
 oslo.i18n>=1.5.0 # Apache-2.0
 coverage>=3.6