diff --git a/tox.ini b/tox.ini
index de73d26..07c94cc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,7 +26,7 @@
 
 [testenv:docs]
 basepython = python3
-commands = python setup.py build_sphinx
+commands = sphinx-build -W -b html -d doc/buld/doctrees doc/source doc/build/html
 
 [testenv:releasenotes]
 basepython = python3