1.8.8.1 is a release only to add an intermediate news post.
To upgrade from a previous Docker release (note it may take several minutes after this release for the packages to be available):
RELEASE=1.8.8.1 && \
TAG=v1.8.8.1 && \
cd /opt/Internet.nl/ && \
curl -sSfO --output-dir docker https://raw.githubusercontent.com/internetstandards/Internet.nl/${TAG}/docker/defaults.env && \
curl -sSfO --output-dir docker https://raw.githubusercontent.com/internetstandards/Internet.nl/${TAG}/docker/docker-compose.yml && \
curl -sSfO https://raw.githubusercontent.com/internetstandards/Internet.nl/${TAG}/docker/user_manage.sh && \
chmod 755 user_manage.sh && \
env -i RELEASE=$RELEASE docker compose --env-file=docker/defaults.env --env-file=docker/host.env --env-file=docker/local.env pull && \
env -i RELEASE=$RELEASE docker compose --env-file=docker/defaults.env --env-file=docker/host.env --env-file=docker/local.env up --remove-orphans --wait --no-build
There are no database (version) migrations compared to earlier 1.8 releases, so no special instructions for a downgrade to the previous release.