diff --git a/requirements.txt b/requirements.txt
index 2f85e48..6059eb9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ changelog>=0.6.1
 doxypypy>=0.8.8
 furo>=2024.8
 myst-parser>=5.1.0
-Sphinx>=8.1
+Sphinx>=9.1.0
 sphinx-basic-ng>=1.0.0b1
 sphinx-book-theme>=1.1.3
 sphinx-git>=11.0.0