Changes in docker-compose.yml not reflecting

Docker Engine Compose
,
1

overwrite the directory /mattermost/client/images/favicon in the container; mapped it to a custom directory on host using the volumes option in the docker-compose.yml file:

    volumes:
      - ${MATTERMOST_CONFIG_PATH}:/mattermost/config:rw
[...]
      - /path/to/new/favicon-files:/mattermost/client/images/favicon:ro

but the favicon is not updated, changes in yml are not reflected