diff --git a/charts/kubeflow/common/knative/knative-eventing/base/upstream/eventing-core.yaml b/charts/kubeflow/common/knative/knative-eventing/base/upstream/eventing-core.yaml
index 510a8b3..109349f 100644
--- a/charts/kubeflow/common/knative/knative-eventing/base/upstream/eventing-core.yaml
+++ b/charts/kubeflow/common/knative/knative-eventing/base/upstream/eventing-core.yaml
@@ -768,7 +768,7 @@ metadata:
     app.kubernetes.io/version: "1.12.6"
     app.kubernetes.io/name: knative-eventing
 spec:
-  minAvailable: 80%
+  minAvailable: 50%
   selector:
     matchLabels:
       app: eventing-webhook
diff --git a/charts/kubeflow/common/knative/knative-serving/base/upstream/serving-core.yaml b/charts/kubeflow/common/knative/knative-serving/base/upstream/serving-core.yaml
index be638c4..4971b95 100644
--- a/charts/kubeflow/common/knative/knative-serving/base/upstream/serving-core.yaml
+++ b/charts/kubeflow/common/knative/knative-serving/base/upstream/serving-core.yaml
@@ -5638,7 +5638,7 @@ metadata:
     app.kubernetes.io/name: knative-serving
     app.kubernetes.io/version: "1.12.4"
 spec:
-  minAvailable: 80%
+  minAvailable: 50%
   selector:
     matchLabels:
       app: activator
@@ -6027,7 +6027,7 @@ metadata:
     app.kubernetes.io/name: knative-serving
     app.kubernetes.io/version: "1.12.4"
 spec:
-  minAvailable: 80%
+  minAvailable: 50%
   selector:
     matchLabels:
       app: webhook
diff --git a/charts/kubeflow/kustomization.yaml b/charts/kubeflow/kustomization.yaml
index f4585cc..999b299 100644
--- a/charts/kubeflow/kustomization.yaml
+++ b/charts/kubeflow/kustomization.yaml
@@ -34,7 +34,6 @@ sortOptions:
 
 resources:
 # Cert-Manager
-- common/cert-manager/cert-manager/base
 - common/cert-manager/kubeflow-issuer/base
 # Istio
 - common/istio-1-22/istio-crds/base