diff --git a/kubernetes/apps/services/roundcube/app/helmrelease.yaml b/kubernetes/apps/services/roundcube/app/helmrelease.yaml
index 65e0cabb73..2b19c746db 100644
--- a/kubernetes/apps/services/roundcube/app/helmrelease.yaml
+++ b/kubernetes/apps/services/roundcube/app/helmrelease.yaml
@@ -41,7 +41,7 @@ spec:
           main:
             image:
               repository: roundcube/roundcubemail
-              tag: 1.6.5-apache
+              tag: 1.6.6-apache@sha256:f7c8b7cec1a377a9cce0d7971fd9b5fdb2c540f90607742d386cf78fa6225ebc
             env:
               ROUNDCUBEMAIL_SKIN: elastic
               ROUNDCUBEMAIL_DEFAULT_HOST: ssl://mail.runbox.com