diff --git a/requirements-optional.txt b/requirements-optional.txt
index bb09d8ba1bb..807356e4832 100644
--- a/requirements-optional.txt
+++ b/requirements-optional.txt
@@ -5,7 +5,7 @@ pre-commit==3.8.0
 ruff==0.6.9
 
 # For generating documentation.
-sphinx==8.1.0
+sphinx==8.1.3
 sphinx-autoapi==3.3.2
 
 # For 'manage' interactive shell