diff --git a/stable/prometheus/Chart.yaml b/stable/prometheus/Chart.yaml
index 0ed71788b9..54b0add6d6 100755
--- a/stable/prometheus/Chart.yaml
+++ b/stable/prometheus/Chart.yaml
@@ -1,5 +1,5 @@
 name: prometheus
-version: 8.9.1
+version: 8.9.2
 appVersion: 2.8.0
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/
diff --git a/stable/prometheus/templates/server-deployment.yaml b/stable/prometheus/templates/server-deployment.yaml
index 98c74f45d9..6aafd8b58d 100644
--- a/stable/prometheus/templates/server-deployment.yaml
+++ b/stable/prometheus/templates/server-deployment.yaml
@@ -87,7 +87,7 @@ spec:
           {{- end }}
           args:
           {{- if .Values.server.retention }}
-            - --storage.tsdb.retention={{ .Values.server.retention }}
+            - --storage.tsdb.retention.time={{ .Values.server.retention }}
           {{- end }}
             - --config.file={{ .Values.server.configPath }}
             - --storage.tsdb.path={{ .Values.server.persistentVolume.mountPath }}
diff --git a/stable/prometheus/templates/server-statefulset.yaml b/stable/prometheus/templates/server-statefulset.yaml
index c6340ac478..5d0041be23 100644
--- a/stable/prometheus/templates/server-statefulset.yaml
+++ b/stable/prometheus/templates/server-statefulset.yaml
@@ -80,7 +80,7 @@ spec:
           imagePullPolicy: "{{ .Values.server.image.pullPolicy }}"
           args:
           {{- if .Values.server.retention }}
-            - --storage.tsdb.retention={{ .Values.server.retention }}
+            - --storage.tsdb.retention.time={{ .Values.server.retention }}
           {{- end }}
             - --config.file={{ .Values.server.configPath }}
             - --storage.tsdb.path={{ .Values.server.persistentVolume.mountPath }}