[stable/zed] Transition to Tox (#1642)

diff --git a/doc/requirements.txt b/doc/requirements.txt
index 8c261cd..a05a1d9 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
-dunamai
 furo
+six
 sphinx
 sphinx-autobuild
 sphinx-copybutton