Is it possible to increase the size of /boot?

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Issue

Is it possible to increase the size of /boot?
Currently /boot shows:

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        97M   89M  3.3M  97% /boot
/dev/sda2 ...

How to extend /boot size?

Environment

Red Hat Enterprise Linux (RHEL) 6, 7

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