diff --git a/src/tests/bundles/bionic-ussuri.yaml b/src/tests/bundles/bionic-ussuri.yaml
index e1fa8a3..20e8f17 100644
--- a/src/tests/bundles/bionic-ussuri.yaml
+++ b/src/tests/bundles/bionic-ussuri.yaml
@@ -43,4 +43,4 @@ applications:
   vault:
     charm: ch:vault
     num_units: 1
-    channel: 1.7/edge
+    channel: 1.6/edge