diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0bf5665..4891aa6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-sphinx==8.0.0
+sphinx==9.1.0
 black==25.11.0
 flake8==7.3.0
 isort==5.12.0