diff --git a/backend/smoke/docker-compose.smoke.yml b/backend/smoke/docker-compose.smoke.yml
index 6f85255..6828706 100644
--- a/backend/smoke/docker-compose.smoke.yml
+++ b/backend/smoke/docker-compose.smoke.yml
@@ -16,7 +16,7 @@
 # `SMOKE_IMAGE` names.
 services:
   greenmail:
-    image: greenmail/standalone:2.1.9
+    image: greenmail/standalone:2.1.15
     environment:
       # One user, no SSL. The IMAP path under test is provider discovery and the search
       # terms, not TLS; TLS is tested against wiremock, where a self-signed certificate