diff --git a/CHANGELOG b/CHANGELOG
index ea3fe9f..833fe94 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -7,6 +7,7 @@ Version TBD
 (released on TBD)
 
 * Run tests on Python 3.7.
+* Use twine check during packaging tests.
 
 Version 1.1.0
 -------------
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9e67f94..dade5d9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -7,4 +7,4 @@ pytest==3.0.7
 pytest-cov==2.4.0
 Sphinx==1.5.5
 tox==2.7.0
-twine==1.8.1
+twine==1.12.1
diff --git a/setup.py b/setup.py
index aba7f2b..3a05894 100755
--- a/setup.py
+++ b/setup.py
@@ -38,6 +38,7 @@ def open_file(filename):
     include_package_data=True,
     description='Helpers for building command-line apps',
     long_description=readme,
+    long_description_content_type='text/x-rst',
     install_requires=[
         'configobj >= 5.0.5',
         'tabulate[widechars] >= 0.8.2',
diff --git a/tox.ini b/tox.ini
index 525dc87..7a020dd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,10 +34,13 @@ commands =
 [testenv:packaging]
 deps =
     check-manifest
-    readme_renderer
+    readme_renderer[md]
+    -r{toxinidir}/requirements-dev.txt
 commands =
     check-manifest
-    ./setup.py check -m -r -s
+    ./setup.py sdist
+    twine check dist/*
+    ./setup.py check -m -s
 
 [testenv:cov-init]
 setenv =