library version

I have a library libxyz.so installed on my CentOs machine.
How do I know what version is this library.

I want to upgrade this library to latest one but firs I need to find what version is the current one
perlperlAsked:
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point_pleasantCommented:
su -c 'yum check-update  libxyz.so'

yum list installed | grep libxyz.so for current version
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