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 9de1ea7..f16fced 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
@@ -5653,6 +5653,7 @@ metadata:
     app.kubernetes.io/version: "1.12.4"
     app.kubernetes.io/name: knative-serving
 spec:
+  replicas: 2
   selector:
     matchLabels:
       app: activator