diff --git a/packages/extra/seaweedfs/templates/client/cosi-bucket-class.yaml b/packages/extra/seaweedfs/templates/client/cosi-bucket-class.yaml
index 76eda0dc..f1389729 100644
--- a/packages/extra/seaweedfs/templates/client/cosi-bucket-class.yaml
+++ b/packages/extra/seaweedfs/templates/client/cosi-bucket-class.yaml
@@ -7,6 +7,17 @@ metadata:
 driverName: {{ .Release.Namespace }}.seaweedfs.objectstorage.k8s.io
 deletionPolicy: Delete
 ---
+kind: BucketClass
+apiVersion: objectstorage.k8s.io/v1alpha1
+metadata:
+  name: {{ .Release.Namespace }}-worm
+driverName: {{ .Release.Namespace }}.seaweedfs.objectstorage.k8s.io
+deletionPolicy: Retain
+parameters:
+  objectLockEnabled: "true"
+  objectLockRetentionMode: "COMPLIANCE"
+  objectLockRetentionDays: "365"
+---
 kind: BucketAccessClass
 apiVersion: objectstorage.k8s.io/v1alpha1
 metadata:
diff --git a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
index e5503abd..39f929c1 100644
--- a/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
+++ b/packages/system/seaweedfs/charts/seaweedfs/templates/cosi/cosi-bucket-class.yaml
@@ -7,6 +7,17 @@ metadata:
 driverName: {{ .Values.cosi.driverName }}
 deletionPolicy: Delete
 ---
+kind: BucketClass
+apiVersion: objectstorage.k8s.io/v1alpha1
+metadata:
+  name: {{ .Values.cosi.bucketClassName }}-worm
+driverName: {{ .Values.cosi.driverName }}
+deletionPolicy: Retain
+parameters:
+  objectLockEnabled: "true"
+  objectLockRetentionMode: "COMPLIANCE"
+  objectLockRetentionDays: "365"
+---
 kind: BucketAccessClass
 apiVersion: objectstorage.k8s.io/v1alpha1
 metadata: