diff --git a/upper-constraints.txt b/upper-constraints.txt
index c0f001d36b..b77c0c0465 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -569,8 +569,8 @@ numpy===1.18.2;python_version=='3.6'
 numpy===1.18.2;python_version=='3.7'
 msgpack===0.6.2
 Sphinx===1.8.5;python_version=='2.7'
-Sphinx===3.0.0;python_version=='3.6'
-Sphinx===3.0.0;python_version=='3.7'
+Sphinx===2.4.4;python_version=='3.6'
+Sphinx===2.4.4;python_version=='3.7'
 oslo.config===7.0.0;python_version=='2.7'
 oslo.config===8.0.1;python_version=='3.6'
 oslo.config===8.0.1;python_version=='3.7'