diff --git a/Makefile b/Makefile
index 002aee7..3559410 100644
--- a/Makefile
+++ b/Makefile
@@ -58,7 +58,7 @@ install: FORCE
 dist: dist/${MODULE}-$(VERSION).tar.gz
 
 dist/${MODULE}-$(VERSION).tar.gz: $(SOURCES)
-	./setup.py sdist
+	./setup.py sdist bdist_wheel
 
 ## clean       : clean up all temporary / machine-generated files
 clean: FORCE
@@ -170,11 +170,12 @@ mypy3: ${PYSOURCES}
 release: FORCE
 	PYVER=2.7 ./release-test.sh
 	PYVER=3 ./release-test.sh
-	. testenv2/bin/activate && \
-		testenv2/src/${MODULE}/setup.py sdist bdist_wheel
-	. testenv2/bin/activate && \
+	. testenv2.7_2/bin/activate && \
+		testenv2.7_2/src/${MODULE}/setup.py sdist bdist_wheel
+	. testenv2.7_2/bin/activate && \
 		pip install twine && \
-		twine upload testenv2/src/${MODULE}/dist/* && \
+		twine upload testenv2.7_2/src/${MODULE}/dist/* \
+		             testenv3_2/src/${MODULE}/dist/*whl && \
 		git tag ${VERSION} && git push --tags
 
 FORCE:
diff --git a/release-test.sh b/release-test.sh
index 27c6768..f295ab9 100755
--- a/release-test.sh
+++ b/release-test.sh
@@ -18,6 +18,7 @@ virtualenv testenv${PYVER}_1 -p python${PYVER}
 virtualenv testenv${PYVER}_2 -p python${PYVER}
 virtualenv testenv${PYVER}_3 -p python${PYVER}
 virtualenv testenv${PYVER}_4 -p python${PYVER}
+virtualenv testenv${PYVER}_5 -p python${PYVER}
 
 # First we test the head
 source testenv${PYVER}_1/bin/activate
@@ -35,25 +36,27 @@ pushd testenv${PYVER}_1/not-${module}; ../bin/${run_tests}; popd
 
 # Secondly we test via pip
 
-cd testenv${PYVER}_2
+pushd testenv${PYVER}_2
 source bin/activate
 rm lib/python-wheels/setuptools* \
 	&& pip install --force-reinstall -U pip==${pipver} \
         && pip install setuptools==${setupver} wheel
 pip install -e git+${repo}@${HEAD}#egg=${package}
-cd src/${package}
+pushd src/${package}
 make install-dependencies
 make dist
 make test
 cp dist/${package}*tar.gz ../../../testenv${PYVER}_3/
+cp dist/${package}*whl ../../../testenv${PYVER}_4/
 pip uninstall -y ${package} || true; pip uninstall -y ${package} || true; make install
-cd ../.. # no subdir named ${proj} here, safe for py.testing the installed module
+popd # ../.. no subdir named ${proj} here, safe for py.testing the installed module
 bin/${run_tests}
+popd
 
-# Is the distribution in testenv${PYVER}_2 complete enough to build another
-# functional distribution?
+# Is the source distribution in testenv${PYVER}_2 complete enough to build
+# another functional distribution?
 
-cd ../testenv${PYVER}_3/
+pushd testenv${PYVER}_3/
 source bin/activate
 rm lib/python-wheels/setuptools* \
 	&& pip install --force-reinstall -U pip==${pipver} \
@@ -62,9 +65,24 @@ pip install ${package}*tar.gz
 pip install pytest
 mkdir out
 tar --extract --directory=out -z -f ${package}*.tar.gz
-cd out/${package}*
+pushd out/${package}*
 make dist
 make test
 pip uninstall -y ${package} || true; pip uninstall -y ${package} || true; make install
 mkdir ../not-${module}
 pushd ../not-${module} ; ../../bin/${run_tests}; popd
+popd
+popd
+
+# Is the wheel in testenv${PYVER}_2 installable and will it pass the tests
+
+pushd testenv${PYVER}_4/
+source bin/activate
+rm lib/python-wheels/setuptools* \
+	&& pip install --force-reinstall -U pip==${pipver} \
+        && pip install setuptools==${setupver} wheel
+pip install ${package}*.whl
+pip install pytest
+mkdir not-${module}
+pushd not-${module} ; ../bin/${run_tests}; popd
+popd
diff --git a/setup.cfg b/setup.cfg
index 903a610..4d2c12b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,7 @@ ignore = E124,E128,E129,E201,E202,E225,E226,E231,E265,E271,E302,E303,F401,E402,E
 [easy_install]
 
 [bdist_wheel]
-universal = 1
+universal = 0
 
 [tool:pytest]
 testpaths = tests
diff --git a/setup.py b/setup.py
index 0c05388..992f055 100755
--- a/setup.py
+++ b/setup.py
@@ -25,12 +25,6 @@
 needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
 pytest_runner = ['pytest-runner'] if needs_pytest else []
 
-if sys.version_info.major == 2:
-    install_requires.extend(['futures >= 3.0.5', 'subprocess32'])
-
-if sys.version_info[:2] < (3, 5):
-    install_requires.append('typing >= 3.5.2')
-
 setup(name='cwltest',
       version='1.0',
       description='Common workflow language testing framework',
@@ -52,4 +46,7 @@
       },
       zip_safe=True,
       cmdclass={'egg_info': tagger},
+      extras_require={':python_version<"3"': [
+                      'futures >= 3.0.5', 'subprocess32'],
+                      ':python_version<"3.5"': ['typing >= 3.5.2'] }
 )