diff --git a/docs/requirements.txt b/docs/requirements.txt
index d657b42..d5d34a4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-Sphinx~=8.0
+Sphinx~=9.1
 sphinx-copybutton~=0.5.0
 sphinx-inline-tabs
 sphinx_rtd_theme~=3.0