diff --git a/.travis.yml b/.travis.yml
index abbb57829..fb62a3493 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,13 @@
 sudo: false
 language: python
 python:
-  - "2.7"
+  - "3.5"
 env:
     - TOX_ENV=py26
     - TOX_ENV=py27
     - TOX_ENV=py33
     - TOX_ENV=py34
+    - TOX_ENV=py35
     - TOX_ENV=flake8
 install:
     - pip install tox
diff --git a/docker/utils/utils.py b/docker/utils/utils.py
index 98cbd61f1..caa98314e 100644
--- a/docker/utils/utils.py
+++ b/docker/utils/utils.py
@@ -546,12 +546,6 @@ def datetime_to_timestamp(dt):
     return delta.seconds + delta.days * 24 * 3600
 
 
-def longint(n):
-    if six.PY3:
-        return int(n)
-    return long(n)
-
-
 def parse_bytes(s):
     if isinstance(s, six.integer_types + (float,)):
         return s
@@ -574,7 +568,7 @@ def parse_bytes(s):
 
     if suffix in units.keys() or suffix.isdigit():
         try:
-            digits = longint(digits_part)
+            digits = int(digits_part)
         except ValueError:
             raise errors.DockerException(
                 'Failed converting the string value for memory ({0}) to'
@@ -582,7 +576,7 @@ def parse_bytes(s):
             )
 
         # Reconvert to long for the final result
-        s = longint(digits * units[suffix])
+        s = int(digits * units[suffix])
     else:
         raise errors.DockerException(
             'The specified value for memory ({0}) should specify the'
diff --git a/setup.py b/setup.py
index fac5129fa..854271102 100644
--- a/setup.py
+++ b/setup.py
@@ -16,6 +16,7 @@
     ':python_version < "3.3"': 'ipaddress >= 1.0.16',
 }
 
+version = None
 exec(open('docker/version.py').read())
 
 with open('./test-requirements.txt') as test_reqs_txt:
@@ -42,10 +43,13 @@
         'Intended Audience :: Developers',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
+        'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
         'Topic :: Utilities',
         'License :: OSI Approved :: Apache Software License',
     ],
diff --git a/test-requirements.txt b/test-requirements.txt
index be4998803..460db1073 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
 mock==1.0.1
-pytest==2.7.2
+pytest==2.9.1
 coverage==3.7.1
 pytest-cov==2.1.0
-flake8==2.4.1
\ No newline at end of file
+flake8==2.4.1
diff --git a/tests/unit/utils_test.py b/tests/unit/utils_test.py
index 47c43ee26..ef927d367 100644
--- a/tests/unit/utils_test.py
+++ b/tests/unit/utils_test.py
@@ -299,56 +299,30 @@ def test_convert_volume_binds_no_mode(self):
         self.assertEqual(convert_volume_binds(data), ['/mnt/vol1:/data:rw'])
 
     def test_convert_volume_binds_unicode_bytes_input(self):
-        if six.PY2:
-            expected = [unicode('/mnt/지연:/unicode/박:rw', 'utf-8')]
-
-            data = {
-                '/mnt/지연': {
-                    'bind': '/unicode/박',
-                    'mode': 'rw'
-                }
-            }
-            self.assertEqual(
-                convert_volume_binds(data), expected
-            )
-        else:
-            expected = ['/mnt/지연:/unicode/박:rw']
+        expected = [u'/mnt/지연:/unicode/박:rw']
 
-            data = {
-                bytes('/mnt/지연', 'utf-8'): {
-                    'bind': bytes('/unicode/박', 'utf-8'),
-                    'mode': 'rw'
-                }
+        data = {
+            u'/mnt/지연'.encode('utf-8'): {
+                'bind': u'/unicode/박'.encode('utf-8'),
+                'mode': 'rw'
             }
-            self.assertEqual(
-                convert_volume_binds(data), expected
-            )
+        }
+        self.assertEqual(
+            convert_volume_binds(data), expected
+        )
 
     def test_convert_volume_binds_unicode_unicode_input(self):
-        if six.PY2:
-            expected = [unicode('/mnt/지연:/unicode/박:rw', 'utf-8')]
-
-            data = {
-                unicode('/mnt/지연', 'utf-8'): {
-                    'bind': unicode('/unicode/박', 'utf-8'),
-                    'mode': 'rw'
-                }
-            }
-            self.assertEqual(
-                convert_volume_binds(data), expected
-            )
-        else:
-            expected = ['/mnt/지연:/unicode/박:rw']
+        expected = [u'/mnt/지연:/unicode/박:rw']
 
-            data = {
-                '/mnt/지연': {
-                    'bind': '/unicode/박',
-                    'mode': 'rw'
-                }
+        data = {
+            u'/mnt/지연': {
+                'bind': u'/unicode/박',
+                'mode': 'rw'
             }
-            self.assertEqual(
-                convert_volume_binds(data), expected
-            )
+        }
+        self.assertEqual(
+            convert_volume_binds(data), expected
+        )
 
 
 class ParseEnvFileTest(base.BaseTestCase):
@@ -612,13 +586,7 @@ def test_create_ipam_config(self):
 class SplitCommandTest(base.BaseTestCase):
 
     def test_split_command_with_unicode(self):
-        if six.PY2:
-            self.assertEqual(
-                split_command(unicode('echo μμ', 'utf-8')),
-                ['echo', 'μμ']
-            )
-        else:
-            self.assertEqual(split_command('echo μμ'), ['echo', 'μμ'])
+        self.assertEqual(split_command(u'echo μμ'), ['echo', 'μμ'])
 
     @pytest.mark.skipif(six.PY3, reason="shlex doesn't support bytes in py3")
     def test_split_command_with_bytes(self):
diff --git a/tox.ini b/tox.ini
index 40e46fafb..be4508e42 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py33, py34, flake8
+envlist = py26, py27, py33, py34, py35, flake8
 skipsdist=True
 
 [testenv]
@@ -11,5 +11,5 @@ deps =
     -r{toxinidir}/requirements.txt
 
 [testenv:flake8]
-commands = flake8 docker tests
+commands = flake8 docker tests setup.py
 deps = flake8