Update: This has now been completed.
Our hosting provider will be carrying out some important software upgrades on Thursday June 2 around 7am GMT (9am CEST, 3am EST, midnight PST). Deckstats may be unavailable for up to two hours while these upgrades are in progress.
Please make sure you save any open decks or collections before this time, and take a backup of anything you might need access to while the site is down.