diff --git a/cluster/kube/lib/rook.libsonnet b/cluster/kube/lib/rook.libsonnet
index 9a0f832..dba8234 100644
--- a/cluster/kube/lib/rook.libsonnet
+++ b/cluster/kube/lib/rook.libsonnet
@@ -757,7 +757,7 @@
             metadata+: cluster.metadata {
                 annotations+: {
                     "kubernetes.io/tls-acme": "true",
-                    "certmanager.k8s.io/cluster-issuer": "letsencrypt-prod",
+                    "cert-manager.io/cluster-issuer": "letsencrypt-prod",
                 },
             },
             spec+: {
@@ -1197,7 +1197,7 @@
             metadata+: zonegroup.realm.cluster.metadata {
                 annotations+: {
                     "kubernetes.io/tls-acme": "true",
-                    "certmanager.k8s.io/cluster-issuer": "letsencrypt-prod",
+                    "cert-manager.io/cluster-issuer": "letsencrypt-prod",
                     "nginx.ingress.kubernetes.io/proxy-body-size": "0",
                 },
             },