Upgrading to latest mattermost ESR release - Docker Compose

Summary
I am trying to update from mattermost 8.1.9 to the latest ESR version, which at the moment is 9.11.1. following this thread Upgrading MM Docker Install but can’t actually update the image. currently using docker-compose.without-nginx.yml and docker-compose.yml files.

Steps to reproduce
I do this:

cd path/to/mattermost

and change versions in MATTERMOST_IMAGE_TAG enviroment variable on config.env. tried 9.11.1, 9.11, 9.5, latest. also looked for changes in env.example to see if the sintaxis changed for some variables.

sudo docker-compose -f docker-compose.yml -f docker-compose.without-nginx.yml down
sudo docker-compose pull
sudo docker-compose -f docker-compose.yml -f docker-compose.without-nginx.yml up -d

Expected behavior
updating to the dessired version

Observed behavior
no updates, it seems like the compose file is still using the same image that was created and is not pulling the new ones. when I do “pull” it doesn’t take more than 3 seconds to update, which is weird.