diff --git a/zuul.d/base.yaml b/zuul.d/base.yaml
index ddf7dc6..77947fa 100644
--- a/zuul.d/base.yaml
+++ b/zuul.d/base.yaml
@@ -17,6 +17,8 @@
       devstack_localrc:
         USE_PYTHON3: true
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_tempest) | join(',') }}"
+        CIRROS_VERSION: 0.5.1
+        BUILD_TIMEOUT: 784
       devstack_plugins:
         neutron: https://opendev.org/openstack/neutron.git
         neutron-tempest-plugin: https://opendev.org/openstack/neutron-tempest-plugin.git
@@ -100,6 +102,7 @@
       tempest_test_regex: ^neutron_tempest_plugin\.scenario
       devstack_localrc:
         PHYSICAL_NETWORK: default
+        CIRROS_VERSION: 0.5.1
         IMAGE_URLS: https://cloud-images.ubuntu.com/releases/bionic/release/ubuntu-18.04-server-cloudimg-amd64.img
         ADVANCED_IMAGE_NAME: ubuntu-18.04-server-cloudimg-amd64
         ADVANCED_INSTANCE_TYPE: ds512M
diff --git a/zuul.d/master_jobs.yaml b/zuul.d/master_jobs.yaml
index 5607274..71dfcb2 100644
--- a/zuul.d/master_jobs.yaml
+++ b/zuul.d/master_jobs.yaml
@@ -271,8 +271,9 @@
         USE_PYTHON3: true
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_dvr) | join(',') }}"
         PHYSICAL_NETWORK: default
-        IMAGE_URLS: https://cloud-images.ubuntu.com/releases/xenial/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img
-        ADVANCED_IMAGE_NAME: ubuntu-16.04-server-cloudimg-amd64-disk1
+        CIRROS_VERSION: 0.5.1
+        IMAGE_URLS: https://cloud-images.ubuntu.com/releases/bionic/release/ubuntu-18.04-server-cloudimg-amd64.img
+        ADVANCED_IMAGE_NAME: ubuntu-18.04-server-cloudimg-amd64
         ADVANCED_INSTANCE_TYPE: ds512M
         ADVANCED_INSTANCE_USER: ubuntu
         BUILD_TIMEOUT: 784