diff --git a/charts/pulsar/values.yaml b/charts/pulsar/values.yaml
index 239a2b5..0fa063f 100644
--- a/charts/pulsar/values.yaml
+++ b/charts/pulsar/values.yaml
@@ -271,7 +271,7 @@ auth:
 ## for components within a Pulsar cluster
 certs:
   internal_issuer:
-    apiVersion: cert-manager.io/v1alpha2
+    apiVersion: cert-manager.io/v1
     enabled: false
     component: internal-cert-issuer
     type: selfsigning
diff --git a/scripts/cert-manager/install-cert-manager.sh b/scripts/cert-manager/install-cert-manager.sh
index 1dbf205..c4abff1 100755
--- a/scripts/cert-manager/install-cert-manager.sh
+++ b/scripts/cert-manager/install-cert-manager.sh
@@ -21,7 +21,7 @@
 
 NAMESPACE=cert-manager
 NAME=cert-manager
-VERSION=v1.1.0
+VERSION=v1.5.4
 
 # Install cert-manager CustomResourceDefinition resources
 echo "Installing cert-manager CRD resources ..."