diff --git a/setup.py b/setup.py
index 07de2a4..d4567e3 100644
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@ setup(
     version=get_version(),
     description='Produce and consume STIX 2 JSON content',
     long_description=get_long_description(),
+    long_description_content_type='text/x-rst',
     url='https://oasis-open.github.io/cti-documentation/',
     author='OASIS Cyber Threat Intelligence Technical Committee',
     author_email='cti-users@lists.oasis-open.org',
diff --git a/tox.ini b/tox.ini
index f3a10fb..ca7b4bc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,9 +34,10 @@ commands =
 
 [testenv:packaging]
 deps =
-  readme_renderer
+  twine
 commands =
-  python setup.py check -r -s
+  python setup.py bdist_wheel --universal
+  twine check dist/*
 
 [travis]
 python =