diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4e4d4ec..512e6f0 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 furo==2025.7.19
-sphinx==8.1.3
+sphinx==9.0.4
 sphinx-click==6.0.0
 myst_parser==4.0.0
 sphinxcontrib-bibtex==2.6.5