In a folder "overleaf" with this file, "docker-compose up -d" and your overleaf will magically be updated. This addresses the overleaf base image which has a dated latex package and a broken update mechanism.

docker-compose.yml

version: "2.2"
services:
  sharelatex:
    restart: always
    image: dennis1f/sharelatex-texlive2018 # sharelatex/sharelatex:latest
    container_name: sharelatex
    depends_on:
      mongo:
        condition: service_healthy
      redis:
        condition: service_started
    privileged: true
    ports:
      - 8123:80 # changed because really? port 80
    links:
      - mongo
      - redis
    volumes:
      - ~/Overleaf/sharelatex_data:/var/lib/sharelatex
      - /var/run/docker.sock:/var/run/docker.sock
    environment:
      SHARELATEX_APP_NAME: Overleaf Community Edition

      SHARELATEX_MONGO_URL: mongodb://mongo/sharelatex

      # Same property, unfortunately with different names in
      # different locations
      SHARELATEX_REDIS_HOST: redis
      REDIS_HOST: redis

      ENABLED_LINKED_FILE_TYPES: "url,project_file"

      # Enables Thumbnail generation using ImageMagick
      ENABLE_CONVERSIONS: "true"

      ## Set for SSL via nginx-proxy
      #VIRTUAL_HOST: 103.112.212.22
      # SHARELATEX_SITE_URL: http://sharelatex.mydomain.com
      # SHARELATEX_NAV_TITLE: Our ShareLaTeX Instance
      # SHARELATEX_HEADER_IMAGE_URL: http://somewhere.com/mylogo.png
      # SHARELATEX_ADMIN_EMAIL: support@it.com
      # SHARELATEX_LEFT_FOOTER: '[{"text": "Powered by <a href=\"https://www.sharelatex.com\">ShareLaTeX</a> 2016"},{"text": "Another page I want to link to can be found <a href=\"here\">here</a>"} ]'
      # SHARELATEX_RIGHT_FOOTER: '[{"text": "Hello I am on the Right"} ]'
      # SHARELATEX_EMAIL_FROM_ADDRESS: "team@sharelatex.com"
      # SHARELATEX_EMAIL_AWS_SES_ACCESS_KEY_ID:
      # SHARELATEX_EMAIL_AWS_SES_SECRET_KEY:
      # SHARELATEX_EMAIL_SMTP_HOST: smtp.mydomain.com
      # SHARELATEX_EMAIL_SMTP_PORT: 587
      # SHARELATEX_EMAIL_SMTP_SECURE: false
      # SHARELATEX_EMAIL_SMTP_USER:
      # SHARELATEX_EMAIL_SMTP_PASS:
      # SHARELATEX_EMAIL_SMTP_TLS_REJECT_UNAUTH: true
      # SHARELATEX_EMAIL_SMTP_IGNORE_TLS: false
      # SHARELATEX_CUSTOM_EMAIL_FOOTER: "<div>This system is run by department x </div>"
      ################
      ## Server Pro ##
      ################
      # SANDBOXED_COMPILES: 'true'
      # SANDBOXED_COMPILES_SIBLING_CONTAINERS: 'true'
      # SANDBOXED_COMPILES_HOST_DIR: '/var/clsi/compiles'
      # DOCKER_RUNNER: 'false'
      ## Works with test LDAP server shown at bottom of docker compose
      # SHARELATEX_LDAP_URL: 'ldap://ldap:389'
      # SHARELATEX_LDAP_SEARCH_BASE: 'ou=people,dc=planetexpress,dc=com'
      # SHARELATEX_LDAP_SEARCH_FILTER: '(uid={{username}})'
      # SHARELATEX_LDAP_BIND_DN: 'cn=admin,dc=planetexpress,dc=com'
      # SHARELATEX_LDAP_BIND_CREDENTIALS: 'GoodNewsEveryone'
      # SHARELATEX_LDAP_EMAIL_ATT: 'mail'
      # SHARELATEX_LDAP_NAME_ATT: 'cn'
      # SHARELATEX_LDAP_LAST_NAME_ATT: 'sn'
      # SHARELATEX_LDAP_UPDATE_USER_DETAILS_ON_LOGIN: 'true'
      # SHARELATEX_TEMPLATES_USER_ID: "578773160210479700917ee5"
      # SHARELATEX_NEW_PROJECT_TEMPLATE_LINKS: '[ {"name":"All Templates","url":"/templates/all"}]'
      # SHARELATEX_PROXY_LEARN: "true"

  mongo:
    restart: always
    image: mongo
    container_name: mongo
    expose:
      - 27017
    volumes:
      - ~/Overleaf/mongo_data:/data/db
    healthcheck:
      test: echo 'db.stats().ok' | mongo localhost:27017/test --quiet
      interval: 10s
      timeout: 10s
      retries: 5

  redis:
    restart: always
    image: redis
    container_name: redis
    expose:
      - 6379
    volumes:
      - ~/Overleaf/redis_data:/data
  # ldap:
  #    restart: always
  #    image: rroemhild/test-openldap
  #    container_name: ldap
  #    expose:
  #        - 389
# nginx-proxy:
#     image: jwilder/nginx-proxy
#     container_name: nginx-proxy
#     ports:
#       #- "80:80"
#       - "443:443"
#     volumes:
#       - /var/run/docker.sock:/tmp/docker.sock:ro
#       - /home/sharelatex/tmp:/etc/nginx/certs