diff --git a/k8s/mailu/mailu.secret.yml b/k8s/mailu/mailu.secret.yml
index 8f3b8cd..a04f5c3 100644
--- a/k8s/mailu/mailu.secret.yml
+++ b/k8s/mailu/mailu.secret.yml
@@ -74,6 +74,6 @@ rspamd:
 certmanager:
   issuerType: ClusterIssuer
   issuerName: "letsencrypt-prod"
-  apiVersion: cert-manager.io/v1alpha2
+  apiVersion: cert-manager.io/v1
 persistence:
   storageClass: openebs-hostpath
\ No newline at end of file