diff --git a/docs/requirements.txt b/docs/requirements.txt
index fd7335ea..fb508558 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
 m2r2>=0.3.2
 sphinx>=8,<9
-sphinx-rtd-theme>=3,<4
+sphinx-rtd-theme>=3.1.0,<4