Hi @Goye, There’s no hard set date, but it is in the best interests of the Network for everyone to update as soon as they can to avoid a disorderly fork
This version contains a protocol change that will cause certain blocks produced by the older versions of the client to be rejected. However, the old clients will under all circumstances accept a block from the new client. Therefore, version 0.5.4 will fork at an unknown time in the future. When it does, if the majority of minting power has upgraded, old clients will join the 0.5.4 fork without incident. If the majority of minting power has not upgraded, there will be a disorderly network fork. Therefore it is of paramount importance that a comfortable majority of minting power upgrade before the fork occurs. Please do your part by upgrading right now.
To upgrade, all you need to do is download the new version and run that instead of the nu client you currently run. All your wallet information is held separately to that and will be picked up by the new client.