diff --git a/docs/requirements.txt b/docs/requirements.txt
index b528dfb..ed2cf2c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -2,4 +2,4 @@
 m2r2>=0.3.2
 sphinx>=7.2.6,<8
 sphinx-autoapi>=3.0.0,<4
-sphinx-rtd-theme>=2.0.0,<3
+sphinx-rtd-theme>=2.0.0,<4