diff --git a/tox.ini b/tox.ini
index 06f44a8..639560a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,7 @@ commands =
 [testenv:doc]
 deps=
     {[testenv]deps}
+    sphinx < 7.0  # temporary until traceability_attributes_sort no longer expects a function
     sphinx_rtd_theme
     mlx.traceability >= 4.3.2
     mlx.warnings >= 5.0.0