There are two types of upgrades: Version upgrades (this corresponds to an upgrade fromDocumentation Index
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0.A.X to 0.B.Y) and protocol upgrades (the actual version can remain the same, only the protocol is upgraded).
Version upgrades can be done by each node independently and only require a helm upgrade. Make sure to read the release_notes to learn about changes you may need to make as part of the upgrade.
Protocol upgrades are performed through logical synchronizer upgrades, which allow upgrading the protocol version with very limited network downtime.
sv_logical_synchronizer_upgrade