diff --git a/docs/source/requirements.txt b/docs/source/requirements.txt
index 717a3703..6f56c98f 100644
--- a/docs/source/requirements.txt
+++ b/docs/source/requirements.txt
@@ -1,3 +1,3 @@
-sphinx>=4.2.0
+sphinx>=9.1.0
 docutils!=0.18
 sphinx_rtd_theme