diff --git a/docs/requirements.txt b/docs/requirements.txt
index fd7335ea..b1526068 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
 m2r2>=0.3.2
-sphinx>=8,<9
+sphinx>=8.1.3,<9
 sphinx-rtd-theme>=3,<4