diff --git a/mx1/containers/stalwart/docker-compose.yml b/mx1/containers/stalwart/docker-compose.yml
index 8d88a1e7..b9093fbb 100644
--- a/mx1/containers/stalwart/docker-compose.yml
+++ b/mx1/containers/stalwart/docker-compose.yml
@@ -36,7 +36,7 @@ services:
       - app-infra
 
   opensearch:
-    image: opensearchproject/opensearch:3.8.0@sha256:bcc1797519726ceb6d651d4a3e60b7c30da91793914a8dfe75fd441d4f641509
+    image: opensearchproject/opensearch:3.9.0@sha256:adfa61f85025d06b4aeb562e7e74fde7e31c437039c93c3862c17e9acebd6c7c
     restart: unless-stopped
     environment:
       discovery.type: single-node