diff --git a/requirements.txt b/requirements.txt
index 6cbb1acc7..f4f3ef6c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-sphinx==3.3.0
+sphinx==4.0.3
 sphinx-autobuild==0.7.1
 sphinx-inline-tabs==2021.4.11b9
 git+https://github.com/python/python-docs-theme.git#egg=python-docs-theme