diff --git a/postal/values.yaml b/postal/values.yaml
index e55da84..9a98b6a 100644
--- a/postal/values.yaml
+++ b/postal/values.yaml
@@ -208,7 +208,7 @@ smtp:
         # -- cert-manager issuer name
         name: lestencrypt
         kind: ClusterIssuer
-        group: cert-manager.io/v1
+        group: cert-manager.io
 
   serviceAccount:
     # Specifies whether a service account should be created