diff --git a/.zuul.yaml b/.zuul.yaml
index 40fe0e29..a672ad27 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -96,11 +96,13 @@
 - job:
     name: patrole-member-ussuri
     parent: patrole-member
+    nodeset: openstack-single-node-bionic
     override-checkout: stable/ussuri
 
 - job:
     name: patrole-member-train
     parent: patrole-member
+    nodeset: openstack-single-node-bionic
     override-checkout: stable/train
     vars:
       devstack_localrc:
@@ -109,6 +111,7 @@
 - job:
     name: patrole-member-stein
     parent: patrole-member
+    nodeset: openstack-single-node-bionic
     override-checkout: stable/stein
     vars:
       devstack_localrc:
diff --git a/lower-constraints.txt b/lower-constraints.txt
index c874f088..c0da9ce4 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -4,7 +4,7 @@ asn1crypto==0.24.0
 Babel==2.5.3
 bcrypt==3.1.4
 certifi==2018.1.18
-cffi==1.11.5
+cffi==1.14.0
 chardet==3.0.4
 cliff==2.11.0
 cmd2==0.8.1
@@ -58,7 +58,7 @@ python-dateutil==2.7.0
 python-mimeparse==1.6.0
 python-subunit==1.2.0
 pytz==2018.3
-PyYAML==3.12
+PyYAML==3.13
 requests==2.18.4
 requestsexceptions==1.4.0
 rfc3986==1.1.0