diff --git a/docs/requirements.txt b/docs/requirements.txt
index b5daf97..130f40a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,5 +3,5 @@ furo==2025.12.19
 myst-parser==5.0.0
 rstcheck[sphinx]==6.2.5
 rstfmt==0.0.14
-Sphinx==8.2.3
+Sphinx==9.1.0
 sphinx-copybutton==0.5.2