1 files changed, 4 insertions, 2 deletions

diff --git a/tox.ini b/tox.ini
index b807b878..eda76cd9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,11 +8,13 @@ deps =
     pretend
     pytest
 commands =
-    coverage run --source=cryptography/,tests/ -m pytest
+    coverage run --source=cryptography/,tests/ -m pytest --strict
     coverage report -m
 
 [testenv:docs]
-deps = sphinx
+deps =
+    sphinx
+    sphinx_rtd_theme
 basepython = python2.7
 commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees docs docs/_build/html