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 109349f..591e014 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
@@ -783,6 +783,7 @@ metadata:
     app.kubernetes.io/version: "1.12.6"
     app.kubernetes.io/name: knative-eventing
 spec:
+  replicas: 2
   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 4971b95..9de1ea7 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
@@ -6042,6 +6042,7 @@ metadata:
     app.kubernetes.io/version: "1.12.4"
     app.kubernetes.io/name: knative-serving
 spec:
+  replicas: 2
   selector:
     matchLabels:
       app: webhook