diff --git a/README.md b/README.md
index 2c7542b..3411231 100644
--- a/README.md
+++ b/README.md
@@ -75,3 +75,8 @@ ALTER USER zammad WITH SUPERUSER CREATEDB;
 To be able to run Zammad container with an unprivileged user we had to change the port Nginx uses from 80 to 8080, so Zammad needs to be accessed via <http://localhost:8080> instead of <http://localhost> now!
 
 This change will also affect you, if you use a reverse proxy, like Traefik or Haproxy, in front of Zammad as your reverse proxy configuration needs to be adapted to point to port 8080 now.
+
+### From =< 4.0.0 to 5.0.0
+
+Memchached config changed. If you use the old env vars `MEMCACHED_HOST` & `MEMCACHED_PORT` addapt to `MEMCACHE_SERVERS`.
+Redis is a dependency for the Websocket server now.
diff --git a/containers/zammad/docker-entrypoint.sh b/containers/zammad/docker-entrypoint.sh
index fbfc2b5..b3d467a 100755
--- a/containers/zammad/docker-entrypoint.sh
+++ b/containers/zammad/docker-entrypoint.sh
@@ -75,6 +75,7 @@ if [ "$1" = 'zammad-init' ]; then
       echo "${AUTOWIZARD_JSON}" | base64 -d > auto_wizard.json
     fi
   else
+    bundle exec rails r "Cache.clear"
     bundle exec rake db:migrate
   fi
 
diff --git a/docker-compose.yml b/docker-compose.yml
index c793b0e..a3a1393 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: '2'
+version: '3'
 
 services:
 
@@ -6,6 +6,7 @@ services:
     command: ["zammad-backup"]
     depends_on:
       - zammad-railsserver
+      - zammad-postgresql
     entrypoint: /usr/local/bin/backup.sh
     environment:
       - BACKUP_SLEEP=86400
@@ -13,8 +14,6 @@ services:
       - POSTGRESQL_USER=${POSTGRES_USER}
       - POSTGRESQL_PASSWORD=${POSTGRES_PASS}
     image: ${IMAGE_REPO}:zammad-postgresql${VERSION}
-    links:
-      - zammad-postgresql
     restart: ${RESTART}
     volumes:
       - zammad-backup:/var/tmp/zammad
@@ -36,9 +35,6 @@ services:
       - POSTGRESQL_USER=${POSTGRES_USER}
       - POSTGRESQL_PASS=${POSTGRES_PASS}
     image: ${IMAGE_REPO}:zammad${VERSION}
-    links:
-      - zammad-elasticsearch
-      - zammad-postgresql
     restart: on-failure
     volumes:
       - zammad-data:/opt/zammad
@@ -55,9 +51,6 @@ services:
     depends_on:
       - zammad-railsserver
     image: ${IMAGE_REPO}:zammad${VERSION}
-    links:
-      - zammad-railsserver
-      - zammad-websocket
     restart: ${RESTART}
     volumes:
       - zammad-data:/opt/zammad
@@ -76,11 +69,8 @@ services:
     depends_on:
       - zammad-memcached
       - zammad-postgresql
+      - zammad-redis
     image: ${IMAGE_REPO}:zammad${VERSION}
-    links:
-      - zammad-elasticsearch
-      - zammad-memcached
-      - zammad-postgresql
     restart: ${RESTART}
     volumes:
       - zammad-data:/opt/zammad
@@ -94,12 +84,8 @@ services:
     depends_on:
       - zammad-memcached
       - zammad-railsserver
-    image: ${IMAGE_REPO}:zammad${VERSION}
-    links:
-      - zammad-elasticsearch
-      - zammad-memcached
-      - zammad-postgresql
       - zammad-redis
+    image: ${IMAGE_REPO}:zammad${VERSION}
     restart: ${RESTART}
     volumes:
       - zammad-data:/opt/zammad
@@ -109,11 +95,8 @@ services:
     depends_on:
       - zammad-memcached
       - zammad-railsserver
-    image: ${IMAGE_REPO}:zammad${VERSION}
-    links:
-      - zammad-postgresql
-      - zammad-memcached
       - zammad-redis
+    image: ${IMAGE_REPO}:zammad${VERSION}
     restart: ${RESTART}
     volumes:
       - zammad-data:/opt/zammad