diff --git a/docker-compose/mail-relay/docker-compose.yml.j2 b/docker-compose/mail-relay/docker-compose.yml.j2
index 95b42843..2c759438 100644
--- a/docker-compose/mail-relay/docker-compose.yml.j2
+++ b/docker-compose/mail-relay/docker-compose.yml.j2
@@ -1,7 +1,7 @@
 version: '3.3'
 services:
   postfix:
-    image: "registry.mgrote.net/postfix:v1.0.137"
+    image: "registry.mgrote.net/postfix:v1.0.139@sha256:79007b4e2507a6aaa4e406580a6060334e09b81e800bb6b68499642d4234e27c"
     container_name: mail-relay
     restart: always
     ports: