diff --git a/setup.cfg b/setup.cfg
index 7056502..366ec13 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -89,7 +89,7 @@ fastapi =
 rdflib =
     rdflib
 docs =
-    sphinx
+    sphinx<7.0
     sphinx-rtd-theme
     sphinx-autodoc-typehints
     sphinx_automodapi