diff --git a/compose/docker-compose-swarm.yml b/compose/docker-compose-swarm.yml
index 1bc5ba5..95df6f9 100644
--- a/compose/docker-compose-swarm.yml
+++ b/compose/docker-compose-swarm.yml
@@ -57,7 +57,7 @@ services:
       - seafile-net
 
   memcached:
-    image: memcached:1.6.20
+    image: memcached:1.6.21
     entrypoint: memcached -m 1024
     networks:
       - seafile-net
diff --git a/compose/docker-compose.yml b/compose/docker-compose.yml
index c5386f9..0fb1387 100644
--- a/compose/docker-compose.yml
+++ b/compose/docker-compose.yml
@@ -55,7 +55,7 @@ services:
       - seafile-net
 
   memcached:
-    image: memcached:1.6.20
+    image: memcached:1.6.21
     entrypoint: memcached -m 1024
     networks:
       - seafile-net