What is the meaning of a new version for CYGWIN?

[Aldi Kraja]

Hi,
I see a lot of emails coming through with changes and updates. Now my 
question is I have downloaded the cygwin, 2 or 3 months ago.
Do I need to reload cygwin for every time someone posts a new change or 
there is rule of thumb in terms of major changes. In other words, what 
represents a new version in cygwin? And do I need to add a patch in my 
installation or reinstall everything?
TIA,
Aldi

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