I believe the limit was already moved down just a little, because some providers provide just a little less than 1G when you get a machine with a nominal 1G. (Perhaps see Fatal error when trying to start Docker (Oracle VM))
What’s your provider? What does
free -m --si
show?
(In any case, if you have enough swap+RAM then the forum will function. If you have too little RAM the forum may run slower and upgrades may take longer. 3G of swap+RAM is enough for a small forum, and it’s what I use.)