diff --git a/charms/neutron-k8s/test-requirements.txt b/charms/neutron-k8s/test-requirements.txt
index 136e575c..c533b127 100644
--- a/charms/neutron-k8s/test-requirements.txt
+++ b/charms/neutron-k8s/test-requirements.txt
@@ -9,3 +9,5 @@ mock
 flake8
 stestr
 ops
+# Subunit 1.4.3+ requires extras
+extras
diff --git a/charms/neutron-k8s/tests/bundles/smoke.yaml b/charms/neutron-k8s/tests/bundles/smoke.yaml
index a12076f8..496157cd 100644
--- a/charms/neutron-k8s/tests/bundles/smoke.yaml
+++ b/charms/neutron-k8s/tests/bundles/smoke.yaml
@@ -47,11 +47,10 @@ applications:
     scale: 1
     trust: true
   tls-operator:
-    charm: tls-certificates-operator
+    charm: self-signed-certificates
     channel: edge
     scale: 1
     options:
-      generate-self-signed-certificates: true
       ca-common-name: internal-ca
 
 relations: