diff --git a/charts/argo-workflows/README.md b/charts/argo-workflows/README.md
index 3423d3ba..e3498867 100644
--- a/charts/argo-workflows/README.md
+++ b/charts/argo-workflows/README.md
@@ -260,7 +260,8 @@ Fields to note:
 | server.GKEmanagedCertificate.domains | list | `["argoworkflows.example.com"]` | Domains for the Google Managed Certificate |
 | server.GKEmanagedCertificate.enabled | bool | `false` | Enable ManagedCertificate custom resource for Google Kubernetes Engine. |
 | server.affinity | object | `{}` | Assign custom [affinity] rules |
-| server.authMode | list | `[]` | A list of supported authentication modes. Available values are `server`, `client`, or `sso`. If you provide sso, please configure `.Values.server.sso` as well. |
+| server.authMode | string | `""` | Deprecated; use server.authModes instead. |
+| server.authModes | list | `[]` | A list of supported authentication modes. Available values are `server`, `client`, or `sso`. If you provide sso, please configure `.Values.server.sso` as well. |
 | server.autoscaling.behavior | object | `{}` | Configures the scaling behavior of the target in both Up and Down directions. This is only available on HPA apiVersion `autoscaling/v2beta2` and newer |
 | server.autoscaling.enabled | bool | `false` | Enable Horizontal Pod Autoscaler ([HPA]) for the Argo Server |
 | server.autoscaling.maxReplicas | int | `5` | Maximum number of replicas for the Argo Server [HPA] |
diff --git a/charts/argo-workflows/templates/NOTES.txt b/charts/argo-workflows/templates/NOTES.txt
index b4933a7d..43c1c8f8 100644
--- a/charts/argo-workflows/templates/NOTES.txt
+++ b/charts/argo-workflows/templates/NOTES.txt
@@ -1,3 +1,7 @@
+{{- if .Values.server.authMode }}
+DEPRECATED option server.authMode - Use server.authModes
+{{- end }}
+
 1. Get Argo Server external IP/domain by running:
 
 kubectl --namespace {{ .Release.Namespace }} get services -o wide | grep {{ template "argo-workflows.server.fullname" . }}
diff --git a/charts/argo-workflows/templates/server/server-deployment.yaml b/charts/argo-workflows/templates/server/server-deployment.yaml
index 392695c8..38c6072b 100644
--- a/charts/argo-workflows/templates/server/server-deployment.yaml
+++ b/charts/argo-workflows/templates/server/server-deployment.yaml
@@ -52,7 +52,10 @@ spec:
           {{- with .Values.server.extraArgs }}
             {{- toYaml . | nindent 10 }}
           {{- end }}
-          {{- range .Values.server.authMode }}
+          {{- if .Values.server.authMode }}
+          - "--auth-mode={{ .Values.server.authMode }}"
+          {{- end }}
+          {{- range .Values.server.authModes }}
           - "--auth-mode={{ . }}"
           {{- end }}
           - "--secure={{ .Values.server.secure }}"
diff --git a/charts/argo-workflows/values.yaml b/charts/argo-workflows/values.yaml
index 2ce388b7..10a0e5a4 100644
--- a/charts/argo-workflows/values.yaml
+++ b/charts/argo-workflows/values.yaml
@@ -536,9 +536,12 @@ server:
     # - name: FOO
     #   value: "bar"
 
+  # -- Deprecated; use server.authModes instead.
+  authMode: ""
+
   # -- A list of supported authentication modes. Available values are `server`, `client`, or `sso`. If you provide sso, please configure `.Values.server.sso` as well.
   ## Ref: https://argoproj.github.io/argo-workflows/argo-server-auth-mode/
-  authMode: []
+  authModes: []
 
   # -- Extra arguments to provide to the Argo server binary.
   ## Ref: https://argoproj.github.io/argo-workflows/argo-server/#options