kubernetes pod deployment not updating

I have a pod egress-operator-controller-manager created from makefile by command make deploy IMG=my_azure_repo/egress-operator:v0.1.

This pod was showing unexpected status: 401 Unauthorized error in description, so I created imagePullSecrets and trying to update this pod with secret by creating pod's deployment.yaml [egress-operator-manager.yaml] file.
But when I am applying this yaml file its giving below error:

root@Ubuntu18-VM:~/egress-operator# kubectl apply -f /home/user/egress-operator-manager.yaml
The Deployment "egress-operator-controller-manager" is invalid: spec.selector: Invalid value:
 v1.LabelSelector{MatchLabels:map[string]string{"moduleId":"egress-operator"}, 
MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable

egress-operator-manager.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: egress-operator-controller-manager
  namespace: egress-operator-system
  labels:
    moduleId: egress-operator
spec:
  replicas: 1
  selector:
    matchLabels:
      moduleId: egress-operator
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        moduleId: egress-operator
    spec:
      containers:
        - image: my_azure_repo/egress-operator:v0.1
          name: egress-operator
      imagePullSecrets:
        - name: mysecret

Can somene let me know that how can I update this pod's deployment.yaml ?