diff --git a/docs/requirements.txt b/docs/requirements.txt
index a304607..6820c81 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-Sphinx~=8.0
+Sphinx~=9.0
 sphinx-copybutton~=0.5.0
 sphinx_rtd_theme~=3.0