diff --git a/lower-constraints.txt b/lower-constraints.txt
index 13bcda9..673996e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -38,7 +38,7 @@ jsonpointer==2.0
 jsonschema==2.6.0
 keystoneauth1==3.4.0
 linecache2==1.0.0
-MarkupSafe==1.0
+MarkupSafe==1.1.1
 monotonic==1.4
 msgpack==0.5.6
 munch==2.2.0
@@ -76,7 +76,7 @@ python-openstackclient==3.14.0
 python-swiftclient==3.5.0
 python-zunclient==3.5.0
 pytz==2018.3
-PyYAML==3.12
+PyYAML==3.13
 rcssmin==1.0.6
 requests==2.18.4
 requestsexceptions==1.4.0