diff --git a/requirements-dev.txt b/requirements-dev.txt
index ac0b7ae..e35f282 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -8,4 +8,4 @@ flake8-requirements==2.3.0
 mypy==1.19.1
 types-passlib==1.7.7.20250602
 pep257==0.7.0
-sphinx==8.1.3
+sphinx==9.1.0