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 f16fced..c405660 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
@@ -5628,21 +5628,6 @@ spec:
           type: Utilization
           averageUtilization: 100
 ---
-apiVersion: policy/v1
-kind: PodDisruptionBudget
-metadata:
-  name: activator-pdb
-  namespace: knative-serving
-  labels:
-    app.kubernetes.io/component: activator
-    app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "1.12.4"
-spec:
-  minAvailable: 50%
-  selector:
-    matchLabels:
-      app: activator
----
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -5653,7 +5638,7 @@ metadata:
     app.kubernetes.io/version: "1.12.4"
     app.kubernetes.io/name: knative-serving
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
       app: activator
@@ -6018,21 +6003,6 @@ spec:
           type: Utilization
           averageUtilization: 100
 ---
-apiVersion: policy/v1
-kind: PodDisruptionBudget
-metadata:
-  name: webhook-pdb
-  namespace: knative-serving
-  labels:
-    app.kubernetes.io/component: webhook
-    app.kubernetes.io/name: knative-serving
-    app.kubernetes.io/version: "1.12.4"
-spec:
-  minAvailable: 50%
-  selector:
-    matchLabels:
-      app: webhook
----
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -6043,7 +6013,7 @@ metadata:
     app.kubernetes.io/version: "1.12.4"
     app.kubernetes.io/name: knative-serving
 spec:
-  replicas: 2
+  replicas: 1
   selector:
     matchLabels:
       app: webhook