diff --git a/clusters/cl01tl/platform/stalwart/templates/elasticsearch.yaml b/clusters/cl01tl/platform/stalwart/templates/elasticsearch.yaml
index 6bc1d06ea..4281c751d 100644
--- a/clusters/cl01tl/platform/stalwart/templates/elasticsearch.yaml
+++ b/clusters/cl01tl/platform/stalwart/templates/elasticsearch.yaml
@@ -8,7 +8,7 @@ metadata:
     app.kubernetes.io/instance: {{ .Release.Name }}
     app.kubernetes.io/part-of: {{ .Release.Name }}
 spec:
-  version: 9.0.4
+  version: 8.18.0
   auth:
     fileRealm:
       - secretName: stalwart-elasticsearch-secret