How do i upgrade to latest version

Hi!
my configurations looks like
GitLab - 11.6.3 (bc9391c2)
GitLab Shell - 8.4.3
GitLab Workhorse - v7.6.0
GitLab APIv4
Ruby2.5.3p105
Rails5.0.7
postgresql10.12 (local server/external posgres)

and postgres is running on local server (https://github.com/sameersbn/docker-gitlab#external-postgresql-server) now i want to upgrade gitlab and redi to latest version and i don't see any documentation around it. Can someone help me how to achieve this one.

version: '2'

services:
  redis:
	restart: always
	image: sameersbn/redis:4.0.9-1
	command:
	- --loglevel warning
	volumes:
	- /datadrive/docker/redis:/var/lib/redis:Z
  gitlab:
	restart: always
	image: sameersbn/gitlab:11.6.3
	depends_on:
	- redis
	ports:
	- "10080:80"
	- "10022:22"
	volumes:
	- /datadrive/docker/gitlab:/home/git/data:Z
	environment:
	- DEBUG=true
	- DB_ADAPTER=postgresql
	- DB_HOST="HOSTNAME-IPaddress"
	- DB_PORT=5432
	- DB_USER=gitlab
	- DB_PASS="pass"
	- DB_NAME=gitlabhq_production

``

No files or tests are named. Start by reviewing the repository's upgrade documentation and the shown Docker Compose configuration, then establish the supported upgrade path for the GitLab image, Redis image, and external PostgreSQL setup; done means the documented procedure covers this configuration and the target latest versions.