diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0e9b5ea3d..0dbe37358 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -190,7 +190,7 @@ snowballstemmer==3.0.1
     # via sphinx
 soupsieve==2.8
     # via beautifulsoup4
-sphinx==8.1.3
+sphinx==9.1.0
     # via
     #   jupyter-sphinx
     #   nbsphinx