diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index 6eb69c5..8c60245 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip setuptools
-          python -m pip install -r requires/lint.txt
+          python -m pip install '.[ci]'
       - name: Flake8
         run: |
           flake8 sprockets tests.py
@@ -37,7 +37,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip setuptools
-          python -m pip install -r requires/testing.txt
+          python -m pip install '.[ci]'
           python -m pip install -e '.[msgpack]'
       - name: Dump packages
         run: python -m pip freeze
@@ -48,7 +48,7 @@ jobs:
           coverage xml -o ./coverage.xml
       - name: Send coverage data to codecov.io
         uses: codecov/codecov-action@v1.3.2
-        if: github.event_name == 'push'
+        if: github.event_name == 'push' && github.repository == 'sprockets/sprockets.mixins.media_type'
         with:
           file: ./coverage.xml
           flags: unittests
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index c332c4a..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,25 +0,0 @@
-language: python
-dist: xenial
-python:
-  - "3.7"
-  - "3.8"
-install:
-  - pip install codecov -r requires/development.txt
-script:
-  - python setup.py build_sphinx
-  - python setup.py check
-  - flake8 sprockets
-  - coverage run -m unittest discover tests
-  - coverage report
-after_success:
-  - codecov
-deploy:
-  distributions: sdist bdist_wheel
-  provider: pypi
-  on:
-    python: 3.8
-    tags: true
-    all_branches: true
-  user: sprockets
-  password:
-    secure: BdTGYPioHV/pxNTKnS1pxBFu4cqJHHNu7VtYebWDVKBtaavYSpyFh3Vbfpx5RpTjJbMHjmJBtGbsbndU8N8BwxAcDrWfvxYtV7IjaPonZCzBzAtieSAwR7qrgb8lPc3Z1qUSjK80zl3PgNTph+0Y2c2wJX84odq689y9nNsV3t9sM+91SqGN5zonuFlM7JlyR0ihJzQVuGq5Wnq66qPd8yErPQjeI3nTPHnRRSLrwCBhengncRKRng/HmJPQ0Ywu84Mcvu3qlOq+Km2mFWAdzjn9dXRhFsHYupzKhg45WFL2jlBpPxeH2J9WTzFTGcTdOSQ3wnfw1TvxNLHcsCAK+QH1WJjuNR4KybwRP142EZ7L1ys4ANQCSe5wcw4FRBqwhMjYd96MiSW5Mp7AnN0s/FBReJJcXccUyVkgENTuyqyM63o7YX9jySp8jRmRtnOkz3K0pydM1HHSY0wn8IC8ElFbVu4OhevOr/w0ZqLwot/lLwTgQgT4qhGDB9PGRd1eHTx2T2GDhXN6pCIXm7Whk5piIsOZoSk1xtzAEoq05bPB5hPfBjoW41uC2W/q2RlKLI/yp9LgNayrUSmNcXCrZ9L37b2aO5UN16yzM4AUilkLteiOMJOze+KMerlwsqoMAPJvoed1ioTd8IPQDFUy/2TQvYKAHGPMkJjenXW540E=
diff --git a/CONTRIBUTING b/CONTRIBUTING
index 4ad338a..c937ef9 100644
--- a/CONTRIBUTING
+++ b/CONTRIBUTING
@@ -18,7 +18,7 @@ you you don't have a choice.  That is why we run our tests using tox.
 The next step is to install the development tools that this project uses.
 These are listed in *requires/development.txt*::
 
-   $ env/bin/pip install -qr requires/development.txt
+   $ env/bin/pip install '.[dev]'
 
 At this point, you will have everything that you need to develop at your
 disposal.  Use the unittest runner to run the test suite or the coverage
@@ -45,7 +45,7 @@ tool chest.  It provides the following commands:
 **./setup.py build_sphinx**
    Generate the documentation using sphinx.
 
-**./setup.py flake8**
+**flake8 sprockets tests.py**
    Run flake8 over the code and report style violations.
 
 If any of the preceding commands give you problems, then you will have to
diff --git a/docs/conf.py b/docs/conf.py
index d33ee0d..f75a38b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,37 +1,35 @@
+import os
+
 import pkg_resources
 
-needs_sphinx = '1.0'
+needs_sphinx = '4.0'
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.viewcode',
               'sphinx.ext.intersphinx',
               'sphinx.ext.extlinks',
-              'sphinxcontrib.autohttp.tornado']
+              'sphinxcontrib.httpdomain']
 master_doc = 'index'
 project = 'sprockets.mixins.mediatype'
-copyright = '2015-2018, AWeber Communications'
+copyright = '2015-2021, AWeber Communications'
 release = pkg_resources.get_distribution('sprockets.mixins.mediatype').version
 version = '.'.join(release.split('.')[0:1])
 
-html_style = 'custom.css'
-html_static_path = ['static']
+# Only install the ReadTheDocs theme when we are not running
+# in the RTD build system.
+if not os.environ.get('READTHEDOCS', None):
+    import sphinx_rtd_theme
+    html_theme = 'sphinx_rtd_theme'
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
 html_sidebars = {
     '**': ['about.html', 'navigation.html'],
 }
-html_theme_options = {
-    'github_user': 'sprockets',
-    'github_repo': 'sprockets.mixins.mediatype',
-    'description': 'Content-Type negotation mix-in',
-    'github_banner': True,
-    'travis_button': True,
-    'sidebar_width': '230px',
-    'codecov_button': True,
-}
 
 intersphinx_mapping = {
     'python': ('https://docs.python.org/3', None),
     'requests': ('https://requests.readthedocs.org/en/latest/', None),
     'sprockets': ('https://sprockets.readthedocs.org/en/latest/', None),
-    'tornado': ('http://tornadoweb.org/en/latest/', None),
+    'tornado': ('https://www.tornadoweb.org/en/stable/', None),
 }
 
 # https://www.sphinx-doc.org/en/master/usage/extensions/extlinks.html
diff --git a/docs/static/custom.css b/docs/static/custom.css
deleted file mode 100644
index 59fb5ed..0000000
--- a/docs/static/custom.css
+++ /dev/null
@@ -1,32 +0,0 @@
-@import url("alabaster.css");
-h1.logo {
-  font-size: 12pt;
-  overflow-wrap: normal;
-  word-wrap: normal;
-  overflow: hidden;
-  margin-right: -25px; /* works together with div.body padding-left */
-}
-div.body {padding-left: 30px;}
-th.field-name {hyphens: none; -webkit-hyphens: none; -ms-hyphens: none;}
-div.document {width: 90%;}
-/* support small screens too! */
-@media screen and (max-width: 1000px) {
-  div.sphinxsidebar {display: none;}
-  div.document {width: 100%!important;}
-  div.bodywrapper {margin-left: 0;}
-  div.highlight pre {margin-right: -30px;}
-}
-@media screen and (min-width: 1000px) {
-  div.bodywrapper {margin-left: default;}
-}
-/* hanging indent for class names
- * would use "text-indent: 2em hanging" if it were supported everywhere
- */
-dl.class > dt, dl.function > dt {
-	text-indent: -4em;
-	padding-left: 4em;
-}
-/* add some space to wrap nicely */
-span.sig-paren::after {
-	content: " ";
-}
diff --git a/requires/development.txt b/requires/development.txt
deleted file mode 100644
index f6ea5a6..0000000
--- a/requires/development.txt
+++ /dev/null
@@ -1,4 +0,0 @@
--e .[msgpack]
--r docs.txt
--r lint.txt
--r testing.txt
diff --git a/requires/docs.txt b/requires/docs.txt
deleted file mode 100644
index 3c555e5..0000000
--- a/requires/docs.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-sphinx==4.2.0
-sphinxcontrib-httpdomain==1.7.0
diff --git a/requires/installation.txt b/requires/installation.txt
deleted file mode 100644
index 0fbae78..0000000
--- a/requires/installation.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-ietfparse>=1.5.1,<2
-tornado>=5,<7
diff --git a/requires/lint.txt b/requires/lint.txt
deleted file mode 100644
index 694f7a4..0000000
--- a/requires/lint.txt
+++ /dev/null
@@ -1 +0,0 @@
-flake8==3.9.2
diff --git a/requires/testing.txt b/requires/testing.txt
deleted file mode 100644
index 1500af8..0000000
--- a/requires/testing.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-coverage==5.5
-tox==3.24.3
diff --git a/setup.cfg b/setup.cfg
index 3eac929..8ba4f09 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,55 @@
-[bdist_wheel]
-universal = 1
+[metadata]
+name = sprockets.mixins.mediatype
+version = attr: sprockets.mixins.mediatype.__version__
+description = A mixin for reporting handling content-type/accept headers.
+long_description = file: README.rst
+long_description_content_type = text/x-rst; charset=UTF-8
+license = BSD 3-Clause License
+license_file = LICENSE
+home_page = https://github.com/sprockets/sprockets.mixins.mediatype
+author = AWeber Communications
+author_email = api@aweber.com
+project_urls =
+    Changelog = https://sprocketsmixinsmedia-type.readthedocs.io/en/latest/history.html
+    Documentation = https://sprocketsmixinsmedia-type.readthedocs.io
+    Download = https://pypi.org/project/sprockets.mixins.mediatype/
+    Source = https://github.com/sprockets/sprockets.mixins.mediatype
+classifiers =
+	Development Status :: 5 - Production/Stable
+	Intended Audience :: Developers
+	License :: OSI Approved :: BSD License
+	Natural Language :: English
+	Operating System :: OS Independent
+	Programming Language :: Python :: 3
+	Programming Language :: Python :: 3.7
+	Programming Language :: Python :: 3.8
+	Programming Language :: Python :: 3.9
+	Programming Language :: Python :: Implementation :: CPython
+	Topic :: Software Development :: Libraries
+	Topic :: Software Development :: Libraries :: Python Modules
+
+[options]
+install_requires =
+	ietfparse>=1.5.1,<2
+	tornado>=5,<7
+
+[options.extras_require]
+msgpack =
+	u-msgpack-python>=2.5.0,<3
+ci =
+	coverage==5.5
+	flake8==3.9.2
+dev =
+	coverage==5.5
+	flake8==3.9.2
+	sphinx==4.2.0
+	sphinx-rtd-theme==1.0.0
+	sphinxcontrib-httpdomain==1.7.0
+	tox==3.24.3
+docs =
+	sphinx==4.2.0
+	sphinx-rtd-theme==1.0.0
+	sphinxcontrib-httpdomain==1.7.0
 
 [build_sphinx]
 fresh-env = 1
diff --git a/setup.py b/setup.py
index f6b5b87..02ea4f0 100755
--- a/setup.py
+++ b/setup.py
@@ -1,56 +1,10 @@
 #!/usr/bin/env python
-import pathlib
+import pkg_resources
 import setuptools
 
-from sprockets.mixins import mediatype
+dist = pkg_resources.get_distribution('setuptools')
+setup_version = tuple(int(c) for c in dist.version.split('.')[:3])
+if setup_version < (42, 0):
+    raise ImportError('Please upgrade setuptools')
 
-REPO_DIR = pathlib.Path(__name__).parent
-
-
-def read_requirements(name):
-    requirements = []
-    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
-
-
-setuptools.setup(
-    name='sprockets.mixins.mediatype',
-    version=mediatype.__version__,
-    description='A mixin for reporting handling content-type/accept headers',
-    long_description=REPO_DIR.joinpath('README.rst').read_text(),
-    url='https://github.com/sprockets/sprockets.mixins.mediatype',
-    author='AWeber Communications',
-    author_email='api@aweber.com',
-    license='BSD',
-    classifiers=[
-        'Development Status :: 5 - Production/Stable',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: BSD License',
-        'Natural Language :: English',
-        'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
-        'Programming Language :: Python :: 3.9',
-        'Programming Language :: Python :: Implementation :: CPython',
-        'Topic :: Software Development :: Libraries',
-        'Topic :: Software Development :: Libraries :: Python Modules'
-    ],
-    packages=setuptools.find_packages(),
-    install_requires=read_requirements('requires/installation.txt'),
-    tests_require=read_requirements('requires/testing.txt'),
-    extras_require={
-        'msgpack': ['u-msgpack-python>=2.5.0,<3']
-    },
-    namespace_packages=['sprockets', 'sprockets.mixins'],
-    test_suite='nose.collector',
-    python_requires='>=3.7',
-    zip_safe=False)
+setuptools.setup()
diff --git a/sprockets/__init__.py b/sprockets/__init__.py
index de40ea7..656dc0f 100644
--- a/sprockets/__init__.py
+++ b/sprockets/__init__.py
@@ -1 +1 @@
-__import__('pkg_resources').declare_namespace(__name__)
+__import__('pkg_resources').declare_namespace(__name__)  # pragma: no cover
diff --git a/sprockets/mixins/__init__.py b/sprockets/mixins/__init__.py
index de40ea7..656dc0f 100644
--- a/sprockets/mixins/__init__.py
+++ b/sprockets/mixins/__init__.py
@@ -1 +1 @@
-__import__('pkg_resources').declare_namespace(__name__)
+__import__('pkg_resources').declare_namespace(__name__)  # pragma: no cover
diff --git a/sprockets/mixins/mediatype/__init__.py b/sprockets/mixins/mediatype/__init__.py
index c53fec5..2d54e3a 100644
--- a/sprockets/mixins/mediatype/__init__.py
+++ b/sprockets/mixins/mediatype/__init__.py
@@ -1,29 +1,15 @@
-"""
-sprockets.mixins.mediatype
-
-"""
+"""sprockets.mixins.mediatype"""
 try:
-    from .content import (ContentMixin, ContentSettings,
+    from .content import (ContentMixin, ContentSettings,  # noqa: F401
                           add_binary_content_type, add_text_content_type,
                           set_default_content_type)
-except ImportError as error:  # noqa: F841  # pragma no cover
-    def _error_closure(*args, **kwargs):
-        raise error  # noqa: F821
-
-    class ErrorClosureClass(object):
-        def __init__(self, *args, **kwargs):
-            raise error  # noqa: F821
-
-    ContentMixin = ErrorClosureClass
-    ContentSettings = ErrorClosureClass
-    add_binary_content_type = _error_closure
-    add_text_content_type = _error_closure
-    set_default_content_type = _error_closure
+except ImportError:  # pragma: no cover
+    import warnings
+    warnings.warn(
+        'Missing runtime requirements for sprockets.mixins.mediatype',
+        UserWarning)
 
 
 version_info = (3, 0, 4)
-__version__ = '.'.join(str(x) for x in version_info)
-
-__all__ = ['ContentMixin', 'ContentSettings', 'add_binary_content_type',
-           'add_text_content_type', 'set_default_content_type',
-           'version_info', '__version__']
+version = '.'.join(str(x) for x in version_info)
+__version__ = version  # compatibility