diff --git a/test-requirements.txt b/test-requirements.txt
index d5673f34..936735ed 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,7 @@ coverage>=3.6
 discover
 mock>=1.0
 python-keystoneclient>=0.6.0
+six>=1.5.2
 sphinx>=1.1.2,<1.2
 testrepository>=0.0.18
 testtools>=0.9.34
diff --git a/tests/test_command_helpers.py b/tests/test_command_helpers.py
index 225805b1..140e9154 100644
--- a/tests/test_command_helpers.py
+++ b/tests/test_command_helpers.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from StringIO import StringIO
+from six import StringIO
 import mock
 import testtools
 
diff --git a/tests/test_swiftclient.py b/tests/test_swiftclient.py
index cb7a0c05..b57bf9f6 100644
--- a/tests/test_swiftclient.py
+++ b/tests/test_swiftclient.py
@@ -16,8 +16,8 @@
 # TODO: More tests
 import mock
 import logging
+import six
 import socket
-import StringIO
 import testtools
 import warnings
 from urlparse import urlparse
@@ -576,7 +576,7 @@ def test_ok(self):
 
     def test_unicode_ok(self):
         conn = c.http_connection(u'http://www.test.com/')
-        mock_file = StringIO.StringIO(u'\u5929\u7a7a\u4e2d\u7684\u4e4c\u4e91')
+        mock_file = six.StringIO(u'\u5929\u7a7a\u4e2d\u7684\u4e4c\u4e91')
         args = (u'\u5929\u7a7a\u4e2d\u7684\u4e4c\u4e91',
                 '\u5929\u7a7a\u4e2d\u7684\u4e4c\u4e91',
                 u'\u5929\u7a7a\u4e2d\u7684\u4e4c\u4e91',
@@ -596,7 +596,7 @@ def test_unicode_ok(self):
 
     def test_chunk_warning(self):
         conn = c.http_connection('http://www.test.com/')
-        mock_file = StringIO.StringIO('asdf')
+        mock_file = six.StringIO('asdf')
         args = ('asdf', 'asdf', 'asdf', 'asdf', mock_file)
         resp = MockHttpResponse()
         conn[1].getresponse = resp.fake_response