diff --git a/requirements.txt b/requirements.txt
index 008c35e..ed0dc16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==8.1.3
+sphinx==9.1.0
 myst_parser==4.0.0
 sphinxcontrib-mermaid==1.0.0
 sphinx-rtd-theme==3.0.2