diff --git a/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml b/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
index fb86a4b..46169ea 100644
--- a/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
+++ b/tcp_tests/templates/virtual-mcp10-contrail/underlay.yaml
@@ -1,5 +1,5 @@
 # Set the repository suite, one of the: 'nightly', 'testing', 'stable', or any other required
-{% set REPOSITORY_SUITE = os_env('REPOSITORY_SUITE', 'stable') %}
+{% set REPOSITORY_SUITE = os_env('REPOSITORY_SUITE', 'testing') %}
 
 {% import 'virtual-mcp10-contrail/underlay--meta-data.yaml' as CLOUDINIT_META_DATA with context %}
 {% import 'virtual-mcp10-contrail/underlay--user-data-cfg01.yaml' as CLOUDINIT_USER_DATA_CFG01 with context %}