diff --git a/requirements.txt b/requirements.txt
index 2a42e7ed5..d9a58b5b6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ netaddr==0.7.19
 pbr==5.4.4
 jmespath==0.9.5
 ruamel.yaml==0.16.10
+MarkupSafe==1.1.1