diff --git a/openstack_requirements/tests/files/upper-constraints.txt b/openstack_requirements/tests/files/upper-constraints.txt
index 337ffa739..b9ae3cc42 100644
--- a/openstack_requirements/tests/files/upper-constraints.txt
+++ b/openstack_requirements/tests/files/upper-constraints.txt
@@ -21,7 +21,7 @@ osprofiler===1.6.0
 bandit===1.4.0
 tabulate===0.7.7
 python-ironic-inspector-client===1.11.0
-lxml===3.7.3
+lxml===4.9.1
 python-kingbirdclient===0.1.0
 pytest===3.0.6
 python-etcd===0.4.5