diff --git a/charts/argo-cd/Chart.yaml b/charts/argo-cd/Chart.yaml
index f2b1c264..b943f562 100644
--- a/charts/argo-cd/Chart.yaml
+++ b/charts/argo-cd/Chart.yaml
@@ -3,7 +3,7 @@ appVersion: v2.11.5
 kubeVersion: ">=1.23.0-0"
 description: A Helm chart for Argo CD, a declarative, GitOps continuous delivery tool for Kubernetes.
 name: argo-cd
-version: 7.3.7
+version: 7.3.8
 home: https://github.com/argoproj/argo-helm
 icon: https://argo-cd.readthedocs.io/en/stable/assets/logo.png
 sources:
@@ -26,5 +26,5 @@ annotations:
     fingerprint: 2B8F22F57260EFA67BE1C5824B11F800CD9D2252
     url: https://argoproj.github.io/argo-helm/pgp_keys.asc
   artifacthub.io/changes: |
-    - kind: changed
-      description: Bump argo-cd to v2.11.5
+    - kind: fixed
+      description: Add Redis Sentinel variables to application controller deployment
diff --git a/charts/argo-cd/templates/argocd-application-controller/deployment.yaml b/charts/argo-cd/templates/argocd-application-controller/deployment.yaml
index 7c4a2a6d..3938c25d 100644
--- a/charts/argo-cd/templates/argocd-application-controller/deployment.yaml
+++ b/charts/argo-cd/templates/argocd-application-controller/deployment.yaml
@@ -208,10 +208,22 @@ spec:
                 name: {{ default "argocd-redis" .Values.externalRedis.existingSecret }}
                 {{- if .Values.externalRedis.host }}
                 key: redis-password
-                optional: true
                 {{- else }}
                 key: auth
                 {{- end }}
+                optional: true
+          - name: REDIS_SENTINEL_USERNAME
+            valueFrom:
+              secretKeyRef:
+                name: {{ default (include "argo-cd.redis.fullname" .) .Values.externalRedis.existingSecret }}
+                key: redis-sentinel-username
+                optional: true
+          - name: REDIS_SENTINEL_PASSWORD
+            valueFrom:
+              secretKeyRef:
+                name: {{ default (include "argo-cd.redis.fullname" .) .Values.externalRedis.existingSecret }}
+                key: redis-sentinel-password
+                optional: true
           - name: ARGOCD_DEFAULT_CACHE_EXPIRATION
             valueFrom:
               configMapKeyRef:
diff --git a/charts/argo-cd/templates/argocd-application-controller/statefulset.yaml b/charts/argo-cd/templates/argocd-application-controller/statefulset.yaml
index 8231f311..3938a759 100644
--- a/charts/argo-cd/templates/argocd-application-controller/statefulset.yaml
+++ b/charts/argo-cd/templates/argocd-application-controller/statefulset.yaml
@@ -205,12 +205,12 @@ spec:
             valueFrom:
               secretKeyRef:
                 name: {{ default "argocd-redis" .Values.externalRedis.existingSecret }}
-                optional: true
                 {{- if .Values.externalRedis.host }}
                 key: redis-password
                 {{- else }}
                 key: auth
                 {{- end }}
+                optional: true
           - name: REDIS_SENTINEL_USERNAME
             valueFrom:
               secretKeyRef: