diff --git a/.gitignore b/.gitignore
index 643fde7..b3b30fe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ downloads
 eggs
 fake-eggs
 parts
+.eggs
 
 # Packages #
 ############
diff --git a/.travis.yml b/.travis.yml
index 70da083..f2a76aa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,23 +1,23 @@
 language: python
+dist: xenial
 python:
-  - 2.7
-  - 3.4
   - 3.5
   - 3.6
-  - 3.7-dev
-  - pypy
+  - 3.7
 install:
-  - pip install codecov
-  - pip install -r requires/installation.txt
-  - pip install -r requires/testing.txt
-script: nosetests
+  - pip install codecov -r requires/development.txt
+script:
+  - nosetests
+  - python setup.py build_sphinx
+  - python setup.py check
+  - flake8
 after_success:
   - codecov
 deploy:
   distributions: sdist bdist_wheel
   provider: pypi
   on:
-    python: 2.7
+    python: 3.7
     tags: true
     all_branches: true
   user: sprockets
diff --git a/LICENSE b/LICENSE
index 4a0e81a..4fa05e6 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2015-2016 AWeber Communications
+Copyright (c) 2015-2018 AWeber Communications
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/README.rst b/README.rst
index 4f46851..659c94e 100644
--- a/README.rst
+++ b/README.rst
@@ -89,13 +89,11 @@ request handlers.
    class SomeHandler(content.ContentMixin, web.RequestHandler):
        def get(self):
            self.send_response({'data': 'value'})
-           self.finish()
 
        def post(self):
            body = self.get_request_body()
            # do whatever
            self.send_response({'action': 'performed'})
-           self.finish()
 
 Based on the settings stored in the ``Application`` instance and the HTTP
 headers, the request and response data will be handled correctly or the
diff --git a/docs/api.rst b/docs/api.rst
index d78d06b..3374348 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -33,6 +33,3 @@ Bundled Transcoders
 
 .. autoclass:: MsgPackTranscoder
    :members:
-
-.. autoclass:: BinaryWrapper
-   :members:
diff --git a/docs/conf.py b/docs/conf.py
index 391ad79..38e751e 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,23 +1,18 @@
-import alabaster
-from sprockets.mixins.mediatype import __version__
+import pkg_resources
 
 needs_sphinx = '1.0'
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.viewcode',
               'sphinx.ext.intersphinx',
               'sphinxcontrib.autohttp.tornado']
-source_suffix = '.rst'
 master_doc = 'index'
 project = 'sprockets.mixins.mediatype'
-copyright = '2015-2016, AWeber Communications'
-release = __version__
+copyright = '2015-2018, AWeber Communications'
+release = pkg_resources.get_distribution('sprockets.mixins.mediatype').version
 version = '.'.join(release.split('.')[0:1])
 
-pygments_style = 'sphinx'
-html_theme = 'alabaster'
 html_style = 'custom.css'
 html_static_path = ['static']
-html_theme_path = [alabaster.get_path()]
 html_sidebars = {
     '**': ['about.html', 'navigation.html'],
 }
diff --git a/examples.py b/examples.py
index bef1f27..354b94a 100644
--- a/examples.py
+++ b/examples.py
@@ -11,7 +11,6 @@ class SimpleHandler(content.ContentMixin, web.RequestHandler):
         body = self.get_request_body()
         self.set_status(200)
         self.send_response(body)
-        self.finish()
 
 
 def make_application(**settings):
diff --git a/requires/development.txt b/requires/development.txt
index d49abfe..7c77917 100644
--- a/requires/development.txt
+++ b/requires/development.txt
@@ -1,4 +1,3 @@
+-e .[msgpack]
+-r docs.txt
 -r testing.txt
--r installation.txt
-sphinx>=1.2,<2
-sphinxcontrib-httpdomain>=1.3,<2
diff --git a/requires/docs.txt b/requires/docs.txt
new file mode 100644
index 0000000..805b414
--- /dev/null
+++ b/requires/docs.txt
@@ -0,0 +1,2 @@
+sphinx==1.8.2
+sphinxcontrib-httpdomain==1.7.0
diff --git a/requires/installation.txt b/requires/installation.txt
index d450f7f..6dfc681 100644
--- a/requires/installation.txt
+++ b/requires/installation.txt
@@ -1,2 +1,2 @@
 ietfparse>=1.4,<1.5
-tornado>=3.2,<6
+tornado>=5,<6
diff --git a/requires/testing.txt b/requires/testing.txt
index 9ce02c6..4f73836 100644
--- a/requires/testing.txt
+++ b/requires/testing.txt
@@ -1,4 +1,4 @@
-coverage>=3.7,<3.99  # prevent installing 4.0b on ALL pip versions
-mock>=1.3,<2
-u-msgpack-python>=2,<3
-nose>=1.3,<2
+coverage==4.5.2
+flake8==3.6.0
+nose==1.3.7
+tox==3.5.3
diff --git a/setup.cfg b/setup.cfg
index 9682f99..308548f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,13 @@
 [bdist_wheel]
 universal = 1
 
+[build_sphinx]
+fresh-env = 1
+warning-is-error = 1
+
+[check]
+strict = 1
+
 [nosetests]
 cover-branches = 1
 cover-erase = 1
diff --git a/setup.py b/setup.py
index 47fa17a..1909304 100755
--- a/setup.py
+++ b/setup.py
@@ -1,38 +1,30 @@
 #!/usr/bin/env python
 #
-
-import os
+import pathlib
 import setuptools
 
-from sprockets.mixins import mediatype
+
+REPO_DIR = pathlib.Path(__name__).parent
 
 
-def read_requirements(file_name):
+def read_requirements(name):
     requirements = []
-    try:
-        with open(os.path.join('requires', file_name)) as req_file:
-            for req_line in req_file:
-                req_line = req_line.strip()
-                if '#' in req_line:
-                    req_line = req_line[0:req_line.find('#')].strip()
-                if req_line.startswith('-r'):
-                    req_line = req_line[2:].strip()
-                    requirements.extend(read_requirements(req_line))
-                else:
-                    requirements.append(req_line)
-    except IOError:
-        pass
+    for req_line in REPO_DIR.joinpath(name).read_text().split('\n'):
+        req_line = req_line.strip()
+        if '#' in req_line:
+            req_line = req_line[0:req_line.find('#')].strip()
+        if req_line.startswith('-r'):
+            req_line = req_line[2:].strip()
+            requirements.extend(read_requirements(req_line))
+        else:
+            requirements.append(req_line)
     return requirements
 
 
-install_requires = read_requirements('installation.txt')
-tests_require = read_requirements('testing.txt')
-
 setuptools.setup(
     name='sprockets.mixins.mediatype',
-    version=mediatype.__version__,
     description='A mixin for reporting handling content-type/accept headers',
-    long_description='\n' + open('README.rst').read(),
+    long_description=REPO_DIR.joinpath('README.rst').read_text(),
     url='https://github.com/sprockets/sprockets.mixins.media_type',
     author='AWeber Communications',
     author_email='api@aweber.com',
@@ -43,24 +35,27 @@ setuptools.setup(
         'License :: OSI Approved :: BSD License',
         'Natural Language :: English',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.6',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.2',
-        'Programming Language :: Python :: 3.3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Libraries',
         'Topic :: Software Development :: Libraries :: Python Modules'
     ],
-    packages=setuptools.find_packages(),
-    install_requires=install_requires,
-    tests_require=tests_require,
+    packages=[
+        'sprockets',
+        'sprockets.mixins',
+        'sprockets.mixins.mediatype'
+    ],
+    install_requires=read_requirements('requires/installation.txt'),
+    tests_require=read_requirements('requires/testing.txt'),
+    extras_require={
+        'msgpack': ['u-msgpack-python>=2.5.0,<3']
+    },
+    setup_requires=['setuptools_scm'],
+    use_scm_version=True,
     namespace_packages=['sprockets', 'sprockets.mixins'],
     test_suite='nose.collector',
+    python_requires='>=3.5',
     zip_safe=False)
diff --git a/sprockets/__init__.py b/sprockets/__init__.py
deleted file mode 100644
index de40ea7..0000000
--- a/sprockets/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)
diff --git a/sprockets/mixins/__init__.py b/sprockets/mixins/__init__.py
deleted file mode 100644
index de40ea7..0000000
--- a/sprockets/mixins/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)
diff --git a/sprockets/mixins/mediatype/__init__.py b/sprockets/mixins/mediatype/__init__.py
index 2acc914..7b32367 100644
--- a/sprockets/mixins/mediatype/__init__.py
+++ b/sprockets/mixins/mediatype/__init__.py
@@ -3,28 +3,11 @@ sprockets.mixins.media_type
 
 """
 
-try:
-    from .content import (ContentMixin, ContentSettings,
-                          add_binary_content_type, add_text_content_type,
-                          set_default_content_type)
-
-except ImportError as error:  # pragma no cover
-    def _error_closure(*args, **kwargs):
-        raise error
-
-    class ErrorClosureClass(object):
-        def __init__(self, *args, **kwargs):
-            raise error
-
-    ContentMixin = ErrorClosureClass
-    ContentSettings = ErrorClosureClass
-    add_binary_content_type = _error_closure
-    add_text_content_type = _error_closure
-    set_default_content_type = _error_closure
+from .content import (ContentMixin, ContentSettings,
+                      add_binary_content_type, add_text_content_type,
+                      set_default_content_type)
 
 
-version_info = (2, 2, 2)
-__version__ = '.'.join(str(v) for v in version_info)
 __all__ = ['ContentMixin', 'ContentSettings', 'add_binary_content_type',
            'add_text_content_type', 'set_default_content_type',
            'version_info', '__version__']
diff --git a/sprockets/mixins/mediatype/content.py b/sprockets/mixins/mediatype/content.py
index 0b5ec9d..e3d636c 100644
--- a/sprockets/mixins/mediatype/content.py
+++ b/sprockets/mixins/mediatype/content.py
@@ -43,7 +43,7 @@ SETTINGS_KEY = 'sprockets.mixins.mediatype.ContentSettings'
 _warning_issued = False
 
 
-class ContentSettings(object):
+class ContentSettings:
     """
     Content selection settings.
 
@@ -75,7 +75,6 @@ class ContentSettings(object):
              response_body = settings['application/msgpack'].to_bytes(
                 response_dict, encoding='utf-8')
              self.write(response_body)
-             self.finish()
 
        def make_application():
           app = web.Application([web.url('/', SomeHandler)])
@@ -277,7 +276,7 @@ def set_default_content_type(application, content_type, encoding=None):
     settings.default_encoding = encoding
 
 
-class ContentMixin(object):
+class ContentMixin:
     """
     Mix this in to add some content handling methods.
 
@@ -288,7 +287,6 @@ class ContentMixin(object):
              body = self.get_request_body()
              # do stuff --> response_dict
              self.send_response(response_dict)
-             self.finish()
 
     :meth:`get_request_body` will deserialize the request data into
     a dictionary based on the :http:header:`Content-Type` request
@@ -300,7 +298,7 @@ class ContentMixin(object):
     """
 
     def initialize(self):
-        super(ContentMixin, self).initialize()
+        super().initialize()
         self._request_body = None
         self._best_response_match = None
         self._logger = getattr(self, 'logger', logger)
diff --git a/sprockets/mixins/mediatype/handlers.py b/sprockets/mixins/mediatype/handlers.py
index a4708ef..ba1dee0 100644
--- a/sprockets/mixins/mediatype/handlers.py
+++ b/sprockets/mixins/mediatype/handlers.py
@@ -10,7 +10,7 @@ Basic content handlers.
 from tornado import escape
 
 
-class BinaryContentHandler(object):
+class BinaryContentHandler:
     """
     Pack and unpack binary types.
 
@@ -58,7 +58,7 @@ class BinaryContentHandler(object):
         return self._unpack(data_bytes)
 
 
-class TextContentHandler(object):
+class TextContentHandler:
     """
     Transcodes between textual and object representations.
 
diff --git a/sprockets/mixins/mediatype/transcoders.py b/sprockets/mixins/mediatype/transcoders.py
index 98291b6..a5123f0 100644
--- a/sprockets/mixins/mediatype/transcoders.py
+++ b/sprockets/mixins/mediatype/transcoders.py
@@ -7,7 +7,6 @@ Bundled media type transcoders.
 """
 import base64
 import json
-import sys
 import uuid
 
 import collections
@@ -20,28 +19,6 @@ except ImportError:
 from sprockets.mixins.mediatype import handlers
 
 
-class BinaryWrapper(bytes):
-    """
-    Ensures that a Python 2 ``str`` is treated as binary.
-
-    Since :class:`bytes` is a synonym for :class:`str` in Python 2,
-    you cannot distinguish between something that should be binary
-    and something that should be encoded as a string.  This is a
-    problem in formats `such as msgpack`_ where binary data and
-    strings are encoded differently.  The :class:`MsgPackTranscoder`
-    accomodates this by trying to UTF-8 encode a :class:`str` instance
-    and falling back to binary encoding if the transcode fails.
-
-    You can avoid this by wrapping binary content in an instance of
-    this class.  The transcoder will then treat it as a binary payload
-    instead of trying to detect whether it is a string or not.
-
-    .. _such as msgpack: http://msgpack.org
-
-    """
-    pass
-
-
 class JSONTranscoder(handlers.TextContentHandler):
     """
     JSON transcoder instance.
@@ -73,8 +50,8 @@ class JSONTranscoder(handlers.TextContentHandler):
 
     def __init__(self, content_type='application/json',
                  default_encoding='utf-8'):
-        super(JSONTranscoder, self).__init__(content_type, self.dumps,
-                                             self.loads, default_encoding)
+        super().__init__(content_type, self.dumps, self.loads,
+                         default_encoding)
         self.dump_options = {
             'default': self.dump_object,
             'separators': (',', ':'),
@@ -128,13 +105,6 @@ class JSONTranscoder(handlers.TextContentHandler):
         | :class:`uuid.UUID`         | Same as ``str(value)``                |
         +----------------------------+---------------------------------------+
 
-        .. warning::
-
-           :class:`bytes` instances are treated as character strings by the
-           standard JSON module in Python 2.7 so the *default* object hook
-           is never called.  In other words, :class:`bytes` values will not
-           be serialized as Base64 strings in Python 2.7.
-
         """
         if isinstance(obj, uuid.UUID):
             return str(obj)
@@ -160,18 +130,14 @@ class MsgPackTranscoder(handlers.BinaryContentHandler):
     .. _msgpack format: http://msgpack.org/index.html
 
     """
-    if sys.version_info[0] < 3:
-        PACKABLE_TYPES = (bool, int, float, long)
-    else:
-        PACKABLE_TYPES = (bool, int, float)
+    PACKABLE_TYPES = (bool, int, float)
 
     def __init__(self, content_type='application/msgpack'):
         if umsgpack is None:
             raise RuntimeError('Cannot import MsgPackTranscoder, '
                                'umsgpack is not available')
 
-        super(MsgPackTranscoder, self).__init__(content_type, self.packb,
-                                                self.unpackb)
+        super().__init__(content_type, self.packb, self.unpackb)
 
     def packb(self, data):
         """Pack `data` into a :class:`bytes` instance."""
@@ -206,7 +172,7 @@ class MsgPackTranscoder(handlers.BinaryContentHandler):
         +-------------------------------+-------------------------------+
         | :class:`float`                | `float family`_               |
         +-------------------------------+-------------------------------+
-        | String (see note)             | `str family`_                 |
+        | String                        | `str family`_                 |
         +-------------------------------+-------------------------------+
         | :class:`bytes`                | `bin family`_                 |
         +-------------------------------+-------------------------------+
@@ -214,8 +180,6 @@ class MsgPackTranscoder(handlers.BinaryContentHandler):
         +-------------------------------+-------------------------------+
         | :class:`memoryview`           | `bin family`_                 |
         +-------------------------------+-------------------------------+
-        | :class:`.BinaryWrapper`       | `bin family`_                 |
-        +-------------------------------+-------------------------------+
         | :class:`collections.Sequence` | `array family`_               |
         +-------------------------------+-------------------------------+
         | :class:`collections.Set`      | `array family`_               |
@@ -225,19 +189,6 @@ class MsgPackTranscoder(handlers.BinaryContentHandler):
         | :class:`uuid.UUID`            | Converted to String           |
         +-------------------------------+-------------------------------+
 
-        .. note::
-
-           :class:`str` and :class:`bytes` are the same before Python 3.
-           If you want a value to be treated as a binary value, then you
-           should wrap it in :class:`.BinaryWrapper` if there is any
-           chance of running under Python 2.7.
-
-           The processing of :class:`str` in Python 2.x attempts to
-           encode the string as a UTF-8 stream.  If the ``encode`` succeeds,
-           then the string is encoded according to the `str family`_.
-           If ``encode`` fails, then the string is encoded according to
-           the `bin family`_ .
-
         .. _nil byte: https://github.com/msgpack/msgpack/blob/
            0b8f5ac67cdd130f4d4d4fe6afb839b989fdb86a/spec.md#formats-nil
         .. _true byte: https://github.com/msgpack/msgpack/blob/
@@ -277,16 +228,6 @@ class MsgPackTranscoder(handlers.BinaryContentHandler):
         if hasattr(datum, 'isoformat'):
             datum = datum.isoformat()
 
-        if sys.version_info[0] < 3 and isinstance(datum, (str, unicode)):
-            if isinstance(datum, str) and not isinstance(datum, BinaryWrapper):
-                # try to decode this into a string to make the common
-                # case work.  If we fail, then send along the bytes.
-                try:
-                    datum = datum.decode('utf-8')
-                except UnicodeDecodeError:
-                    pass
-            return datum
-
         if isinstance(datum, (bytes, str)):
             return datum
 
diff --git a/tests.py b/tests.py
index aaae490..6f59077 100644
--- a/tests.py
+++ b/tests.py
@@ -4,7 +4,6 @@ import json
 import os
 import pickle
 import struct
-import sys
 import unittest
 import uuid
 
@@ -28,7 +27,7 @@ class UTC(datetime.tzinfo):
         return 'UTC'
 
 
-class Context(object):
+class Context:
     """Super simple class to call setattr on"""
     def __init__(self):
         self.settings = {}
@@ -37,27 +36,27 @@ class Context(object):
 def pack_string(obj):
     """Optimally pack a string according to msgpack format"""
     payload = str(obj).encode('ASCII')
-    l = len(payload)
-    if l < (2 ** 5):
-        prefix = struct.pack('B', 0b10100000 | l)
-    elif l < (2 ** 8):
-        prefix = struct.pack('BB', 0xD9, l)
-    elif l < (2 ** 16):
-        prefix = struct.pack('>BH', 0xDA, l)
+    pl = len(payload)
+    if pl < (2 ** 5):
+        prefix = struct.pack('B', 0b10100000 | pl)
+    elif pl < (2 ** 8):
+        prefix = struct.pack('BB', 0xD9, pl)
+    elif pl < (2 ** 16):
+        prefix = struct.pack('>BH', 0xDA, pl)
     else:
-        prefix = struct.pack('>BI', 0xDB, l)
+        prefix = struct.pack('>BI', 0xDB, pl)
     return prefix + payload
 
 
 def pack_bytes(payload):
     """Optimally pack a byte string according to msgpack format"""
-    l = len(payload)
-    if l < (2 ** 8):
-        prefix = struct.pack('BB', 0xC4, l)
-    elif l < (2 ** 16):
-        prefix = struct.pack('>BH', 0xC5, l)
+    pl = len(payload)
+    if pl < (2 ** 8):
+        prefix = struct.pack('BB', 0xC4, pl)
+    elif pl < (2 ** 16):
+        prefix = struct.pack('>BH', 0xC5, pl)
     else:
-        prefix = struct.pack('>BI', 0xC6, l)
+        prefix = struct.pack('>BI', 0xC6, pl)
     return prefix + payload
 
 
@@ -111,16 +110,16 @@ class GetRequestBodyTests(testing.AsyncHTTPTestCase):
     def test_that_request_with_unhandled_type_results_in_415(self):
         response = self.fetch(
             '/', method='POST', headers={'Content-Type': 'application/xml'},
-            body=(u'<request><name>value</name>'
-                  u'<embedded><utf8>\u2731</utf8></embedded>'
-                  u'</request>').encode('utf-8'))
+            body=('<request><name>value</name>'
+                  '<embedded><utf8>\u2731</utf8></embedded>'
+                  '</request>').encode('utf-8'))
         self.assertEqual(response.code, 415)
 
     def test_that_msgpack_request_returns_default_type(self):
         body = {
             'name': 'value',
             'embedded': {
-                'utf8': u'\u2731'
+                'utf8': '\u2731'
             }
         }
         response = self.fetch('/', method='POST', body=umsgpack.packb(body),
@@ -140,7 +139,7 @@ class GetRequestBodyTests(testing.AsyncHTTPTestCase):
 class JSONTranscoderTests(unittest.TestCase):
 
     def setUp(self):
-        super(JSONTranscoderTests, self).setUp()
+        super().setUp()
         self.transcoder = transcoders.JSONTranscoder()
 
     def test_that_uuids_are_dumped_as_strings(self):
@@ -161,13 +160,6 @@ class JSONTranscoderTests(unittest.TestCase):
         self.assertEqual(dumped.replace(' ', ''),
                          '{"now":"%s"}' % obj['now'].isoformat())
 
-    @unittest.skipIf(sys.version_info[0] == 2, 'bytes unsupported on python 2')
-    def test_that_bytes_are_base64_encoded(self):
-        bin = bytes(os.urandom(127))
-        dumped = self.transcoder.dumps({'bin': bin})
-        self.assertEqual(
-            dumped, '{"bin":"%s"}' % base64.b64encode(bin).decode('ASCII'))
-
     def test_that_bytearrays_are_base64_encoded(self):
         bin = bytearray(os.urandom(127))
         dumped = self.transcoder.dumps({'bin': bin})
@@ -226,7 +218,7 @@ class ContentSettingsTests(unittest.TestCase):
 class ContentFunctionTests(unittest.TestCase):
 
     def setUp(self):
-        super(ContentFunctionTests, self).setUp()
+        super().setUp()
         self.context = Context()
 
     def test_that_add_binary_content_type_creates_binary_handler(self):
@@ -281,11 +273,11 @@ class ContentFunctionTests(unittest.TestCase):
 class MsgPackTranscoderTests(unittest.TestCase):
 
     def setUp(self):
-        super(MsgPackTranscoderTests, self).setUp()
+        super().setUp()
         self.transcoder = transcoders.MsgPackTranscoder()
 
     def test_that_strings_are_dumped_as_strings(self):
-        dumped = self.transcoder.packb(u'foo')
+        dumped = self.transcoder.packb('foo')
         self.assertEqual(self.transcoder.unpackb(dumped), 'foo')
         self.assertEqual(dumped, pack_string('foo'))
 
@@ -373,6 +365,6 @@ class MsgPackTranscoderTests(unittest.TestCase):
 
     def test_that_utf8_values_can_be_forced_to_bytes(self):
         data = b'a ascii value'
-        dumped = self.transcoder.packb(transcoders.BinaryWrapper(data))
+        dumped = self.transcoder.packb(data)
         self.assertEqual(self.transcoder.unpackb(dumped), data)
         self.assertEqual(dumped, pack_bytes(data))
diff --git a/tox.ini b/tox.ini
index a8ff895..884e23c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,pypy
+envlist = py35,py36,py37
 indexserver =
 	default = https://pypi.python.org/simple
 toxworkdir = build/tox
@@ -7,6 +7,6 @@ skip_missing_interpreters = true
 
 [testenv]
 deps =
-	-rrequires/installation.txt
-	-rrequires/testing.txt
+    -e .[msgpack]
+    -r requires/testing.txt
 commands = nosetests []