In order to update your Docker node, run the following commands.
Note 1: Make sure that you have your data in the persistent storage like myst-data.
Note 2: You can backup your keys before trying to update node version FAQ.
Pull the latest node image.
docker pull mysteriumnetwork/myst
Delete the container that is already being used for running node:
docker rm -f myst
Follow the running a docker node guide to start a new container.