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
diff --git a/flux2/infrastructure/cert-manager/release.yaml b/flux2/infrastructure/cert-manager/release.yaml
index e517c0ace632c91733d4e9047f419e8e8fce4bed..43247cdb1d684eddd9024e689f456294fd0bbe17 100644
--- a/flux2/infrastructure/cert-manager/release.yaml
+++ b/flux2/infrastructure/cert-manager/release.yaml
@@ -10,7 +10,7 @@ spec:
       # https://artifacthub.io/packages/helm/cert-manager/cert-manager
       # renovate: registryUrl=https://charts.jetstack.io
       chart: cert-manager
-      version: v1.5.4
+      version: v1.6.0
       sourceRef:
         kind: HelmRepository
         name: jetstack