diff --git a/requirements-doc.txt b/requirements-doc.txt
index a2bb3511..9d7893ff 100644
--- a/requirements-doc.txt
+++ b/requirements-doc.txt
@@ -6,7 +6,7 @@ numba
 # document requirements
 pandoc
 Jinja2
-sphinx>=5, <9.1.0
+sphinx>=9.0.4, <9.1.0
 myst-nb
 sphinx_thebe
 sphinx-autodoc-typehints