diff --git a/docs/requirements.txt b/docs/requirements.txt
index b9cbbe7..eca0433 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-sphinx           == 3.5.3
+sphinx           == 4.3.0
 sphinx_rtd_theme == 0.5.1
 sphinx-computron >= 0.2, < 2.0