diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9a9d8c0..4a97ba1 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
 sphinx-markdown-tables>=0.0.14,<0.1.0
 recommonmark>=0.6.0,<0.8.0
-sphinx>=3.0.0,<3.6.0
+sphinx>=3.0.0,<4.1.0