diff --git a/docs/requirements.txt b/docs/requirements.txt
index cedc294b..11a8e348 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,7 +4,7 @@ furo==2025.9.25
 linkify-it-py==2.0.3
 matplotlib==3.10.7
 myst-nb==1.3.0
-sphinx==8.2.3
+sphinx==9.1.0
 sphinx-click==6.1.0
 sphinx-copybutton==0.5.2
 sphinx-design==0.6.1