diff --git a/flux2/core/base/cluster-issuer/cluster-issuer.yaml b/flux2/core/base/cluster-issuer/cluster-issuer.yaml
index a9de6a87b17305097ece4a2b438e9208a71a61c6..31371b4a1f5039920b1c229272bee7163562046e 100644
--- a/flux2/core/base/cluster-issuer/cluster-issuer.yaml
+++ b/flux2/core/base/cluster-issuer/cluster-issuer.yaml
@@ -1,5 +1,5 @@
 ---
-apiVersion: cert-manager.io/v1alpha2
+apiVersion: cert-manager.io/v1
 kind: ClusterIssuer
 metadata:
   name: letsencrypt-issuer