A witness runs the code that keeps Hive running, but they also choose what to run. Seeing as most witnesses are not technical and just running Hive in a Box, it's kind of just people running whatever everyone else runs without a thought.
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Oh so you don't even need the specific version to run... Explains why lot of witnesses have old versions, it's just a copying "you do that so I do too"
Thanks for explaining
!PIZZA
You have to run the same major version, but there are some updates that are minor or only affect full nodes and are not required for witness nodes.