diff --git a/.travis.yml b/.travis.yml
index 1787f61..405a1cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,11 +12,7 @@ matrix:
   allow_failures:
     - python: "nightly"
 install:
-  - pip install --upgrade coveralls pytest "pytest-cov>=2.5.1" dataclasses typing_extensions
-  # mypy can't be installed on pypy
-  - if [[ "${TRAVIS_PYTHON_VERSION}" != "pypy"* ]] ; then pip install mypy ; fi
-  # Black is Python 3.6+-only
-  - if [[ "${TRAVIS_PYTHON_VERSION}" != "pypy"* ]] ; then pip install black ; fi
+  - pip install --upgrade -r requirements.txt -r requirements-dev.txt
 script:
   - py.test -vv --cov=injector --cov-branch --cov-report html --cov-report term
   - if [[ "${TRAVIS_PYTHON_VERSION}" != "pypy"* ]] ; then mypy injector ; fi
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..953188b
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,6 @@
+pytest
+coveralls
+pytest-cov>=2.5.1
+dataclasses;python_version<"3.7"
+mypy;implementation_name=="cpython"
+black;implementation_name=="cpython"
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..bcc17af
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+typing_extensions>=3.7.4;python_version<"3.9"
diff --git a/setup.py b/setup.py
index f80f299..68ec6a7 100644
--- a/setup.py
+++ b/setup.py
@@ -6,6 +6,13 @@ import warnings
 warnings.filterwarnings("always", module=__name__)
 
 
+def obtain_requirements(file_name):
+    with open(file_name) as fd_in:
+        for line in fd_in:
+            if '#' not in line:
+                yield line.strip()
+
+
 class PyTest(Command):
     user_options = []
 
@@ -34,6 +41,11 @@ def read_injector_variable(name):
 version = read_injector_variable('__version__')
 version_tag = read_injector_variable('__version_tag__')
 
+
+requirements = list(obtain_requirements('requirements.txt'))
+requirements_dev = list(obtain_requirements('requirements-dev.txt'))
+
+
 try:
     import pypandoc
 
@@ -61,6 +73,7 @@ setup(
     author='Alec Thomas',
     author_email='alec@swapoff.org',
     cmdclass={'test': PyTest},
+    extras_require={'dev': requirements_dev},
     keywords=[
         'Dependency Injection',
         'DI',
@@ -69,5 +82,5 @@ setup(
         'IoC',
         'Inversion of Control container',
     ],
-    install_requires=['typing_extensions>=3.7.4;python_version<"3.9"'],
+    install_requires=requirements,
 )