If you have cloned the git repository it's safe to pull the new version.
If you have used a zip file make sure to replace the docker/ directory and also
update docker-compose.yml and docker-environment.yml.
As PHP_UID was replaced with EFFECTIVE_UID and PHP_GID was replaced with EFFECTIVE_GID you
have to rebuild all containers with this variables: main and web
docker-compose stop
docker-compose rm --force main web
docker-compose build --no-cache main web
docker-compose up