diff --git a/tox.ini b/tox.ini
index 55dabf8c..e28ec569 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ deps =
     sphinx32: Sphinx < 3.3
     sphinx33: Sphinx < 3.4
     sphinx34: Sphinx < 3.5
-    sphinx35: Sphinx < 4.0
+    sphinx35: Sphinx < 3.6
     sphinx40: Sphinx < 4.1
     sphinxlatest: Sphinx
 commands =