diff --git a/tox.ini b/tox.ini
index cf27ff9d1..035cfd24e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,8 @@ deps = bindep
 commands = bindep test
 
 [testenv:docs]
-commands = python setup.py build_sphinx
+commands =
+  sphinx-build -E -W -d doc/build/doctrees -b html doc/source/ doc/build/html
 
 [testenv:linters]
 passenv =