diff --git a/doc/requirements.txt b/doc/requirements.txt
index 17f4e32..1d39179 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,2 @@
-Sphinx>=3.2.0
+Sphinx>=8.1.3
 sphinx-rtd-theme>=0.5.0