diff --git a/doc/requirements.txt b/doc/requirements.txt
index 17f4e32..82d2d52 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,2 +1,2 @@
 Sphinx>=3.2.0
-sphinx-rtd-theme>=0.5.0
+sphinx-rtd-theme>=3.1.0