diff --git a/cmake/tribits/doc/sphinx/requirements.txt b/cmake/tribits/doc/sphinx/requirements.txt
index e769b45a76..ceffc08516 100644
--- a/cmake/tribits/doc/sphinx/requirements.txt
+++ b/cmake/tribits/doc/sphinx/requirements.txt
@@ -1,2 +1,2 @@
-Sphinx==8.2.3
+Sphinx==9.1.0
 sphinx-rtd-theme==3.1.0