diff --git a/README.md b/README.md
index 7fe6550..427c9c0 100644
--- a/README.md
+++ b/README.md
@@ -24,13 +24,14 @@ $ helm install cert-manager-webhook-dnsimple \
     --set clusterIssuer.email=email@example.com \
     neoskop/cert-manager-webhook-dnsimple
 ```
+
 _(Alternatively you can check out this repository and substitute neoskop/cert-manager-webhook-dnsimple with ./deploy/dnsimple)_
 
 Afterwards issue a certificate:
 
 ```bash
 $ cat << EOF | kubectl apply -f -
-apiVersion: cert-manager.io/v1alpha3
+apiVersion: cert-manager.io/v1
 kind: Certificate
 metadata:
   name: dnsimple-test
diff --git a/deploy/dnsimple/templates/production.cluster-issuer.yaml b/deploy/dnsimple/templates/production.cluster-issuer.yaml
index 2ec8051..9dc9974 100644
--- a/deploy/dnsimple/templates/production.cluster-issuer.yaml
+++ b/deploy/dnsimple/templates/production.cluster-issuer.yaml
@@ -1,5 +1,5 @@
 {{- if .Values.clusterIssuer.production.enabled -}}
-apiVersion: cert-manager.io/v1alpha3
+apiVersion: cert-manager.io/v1
 kind: ClusterIssuer
 metadata:
   name: {{ include "dnsimple-webhook.fullname" . }}-production
diff --git a/deploy/dnsimple/templates/staging.cluster-issuer.yaml b/deploy/dnsimple/templates/staging.cluster-issuer.yaml
index b4b0cf4..f1a3033 100644
--- a/deploy/dnsimple/templates/staging.cluster-issuer.yaml
+++ b/deploy/dnsimple/templates/staging.cluster-issuer.yaml
@@ -1,5 +1,5 @@
 {{- if .Values.clusterIssuer.staging.enabled -}}
-apiVersion: cert-manager.io/v1alpha3
+apiVersion: cert-manager.io/v1
 kind: ClusterIssuer
 metadata:
   name: {{ include "dnsimple-webhook.fullname" . }}-staging