diff --git a/kubernetes/apps/cert-manager/cert-manager/selfsigned/certificate.yaml b/kubernetes/apps/cert-manager/cert-manager/selfsigned/certificate.yaml
deleted file mode 100644
index fb7dfac1..00000000
--- a/kubernetes/apps/cert-manager/cert-manager/selfsigned/certificate.yaml
+++ /dev/null
@@ -1,39 +0,0 @@
----
-# yaml-language-server: $schema=https://kubernetes-schemas.pages.dev/cert-manager.io/certificate_v1.json
-apiVersion: cert-manager.io/v1
-kind: Certificate
-metadata:
-  name: &name home-selfsigned-ca
-spec:
-  isCA: true
-  commonName: *name
-  subject:
-    organizations:
-      - ${SECRET_INTERNAL_DOMAIN}
-  secretName: root-secret
-  privateKey:
-    algorithm: ECDSA
-    size: 256
-  issuerRef:
-    name: selfsigned-issuer
-    kind: ClusterIssuer
-    group: cert-manager.io
----
-apiVersion: cert-manager.io/v1
-kind: Certificate
-metadata:
-  name: &name strong-selfsigned-ca
-spec:
-  isCA: true
-  commonName: *name
-  subject:
-    organizations:
-      - ${SECRET_INTERNAL_DOMAIN}
-  secretName: strong-root-secret
-  privateKey:
-    algorithm: ECDSA
-    size: 384
-  issuerRef:
-    name: selfsigned-issuer
-    kind: ClusterIssuer
-    group: cert-manager.io
diff --git a/kubernetes/apps/cert-manager/cert-manager/selfsigned/clusterissuer.yaml b/kubernetes/apps/cert-manager/cert-manager/selfsigned/clusterissuer.yaml
index d801a661..96409899 100644
--- a/kubernetes/apps/cert-manager/cert-manager/selfsigned/clusterissuer.yaml
+++ b/kubernetes/apps/cert-manager/cert-manager/selfsigned/clusterissuer.yaml
@@ -1,5 +1,28 @@
 ---
-# yaml-language-server: $schema=https://kubernetes-schemas.pages.dev/cert-manager.io/clusterissuer_v1.json
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: selfsigned-issuer
+spec:
+  selfSigned: {}
+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: home-selfsigned-ca
+  namespace: cert-manager
+spec:
+  isCA: true
+  commonName: home-selfsigned-ca
+  secretName: root-secret
+  privateKey:
+    algorithm: ECDSA
+    size: 256
+  issuerRef:
+    name: selfsigned-issuer
+    kind: ClusterIssuer
+    group: cert-manager.io
+---
 apiVersion: cert-manager.io/v1
 kind: ClusterIssuer
 metadata:
@@ -7,11 +30,3 @@ metadata:
 spec:
   ca:
     secretName: root-secret
----
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: strong-ca-issuer
-spec:
-  ca:
-    secretName: strong-root-secret
diff --git a/kubernetes/apps/cert-manager/cert-manager/selfsigned/kustomization.yaml b/kubernetes/apps/cert-manager/cert-manager/selfsigned/kustomization.yaml
index c856d5d3..456611d1 100644
--- a/kubernetes/apps/cert-manager/cert-manager/selfsigned/kustomization.yaml
+++ b/kubernetes/apps/cert-manager/cert-manager/selfsigned/kustomization.yaml
@@ -3,5 +3,4 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-  - ./certificate.yaml
   - ./clusterissuer.yaml