There's a lemmy upgrade either tmrw or wednesday, so Lemmygrad will have some downtime. - eviltoast
Lemmy upgrade tomorrow (or wednesday), and we'll have a few hours of downtime. - Lemmy
lemmy.ml
We’re getting ready to release a new version of Lemmy, which will require a database upgrade, so we’ll have a few hours of downtime.

From the link:

We’re getting ready to release a new version of Lemmy, which will require a database upgrade, so we’ll have a few hours of downtime.