diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4e27896..3eb944f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
 furo>=2024.8.6
-sphinx>=8.0
+sphinx>=9.1.0
 myst-parser>=4.0