In order to update your Docker node, run the following commands.
Check the Repository, Tag, Image ID, Creation date and size of the current build:
docker images
Delete the image that is already being used by Docker container:
docker rmi -f {Image ID}
Install the latest node version:
mysteriumnetwork/myst:latest
if Docker will be unable to find the required image locally, it will pull from mysteriumnetwork/myst repository.