diff --git a/docs/requirements.txt b/docs/requirements.txt
index 3a0f487..774e3e3 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-sphinx>=3.0.3
+sphinx>=9.1.0
 sphinx-autoapi>=1.3.0
 sphinx-rtd-theme>=0.4.3