diff --git a/requirements/requirements_doc.txt b/requirements/requirements_doc.txt
index 779d5a55..dc6e7361 100644
--- a/requirements/requirements_doc.txt
+++ b/requirements/requirements_doc.txt
@@ -1,4 +1,4 @@
-Sphinx==8.2.3
+Sphinx==9.0.0
 ansys-sphinx-theme==1.6.3
 sphinx-copybutton==0.5.2
 sphinx_toolbox==4.0.0