diff --git a/website/requirements.txt b/website/requirements.txt
index e4ca40a7..18e99845 100644
--- a/website/requirements.txt
+++ b/website/requirements.txt
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright (c) Contributors to the OpenEXR Project.
 
-sphinx == 7.4.2
+sphinx == 9.0.0
 breathe
 sphinx-press-theme