diff --git a/tox.ini b/tox.ini
index 8fde369e..5504d67f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,7 +37,7 @@ deps = flake8
 commands = sphinx-build -WE docs _docs
 deps =
     sphinx
-    sphinx-rtd-theme
+    furo
 
 [testenv:warnings]
 ignore_outcome = True