diff --git a/requirements.txt b/requirements.txt
index 6a581002b5b..80823881a9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ Babel==2.2.0
 Jinja2==2.8
 MarkupSafe==0.23
 Pygments==2.1.3
-Sphinx==1.3.6
+Sphinx==4.1.2
 alabaster==0.7.7
 check-manifest==0.31
 cov-core==1.15.0