Increase swap space size(?)

Hello everyone, hope you're fine...

My server is running on CentOS 7.2.1511 with Plesk Onyx 17.8.11
Server RAM: 16 GB
Server Type: Virtual Private Server (VPS)

I have 4GB swap space on my server.

May I increase my server's swap space to 8GB or 16GB?

Is this possible?

Thank you for your replies,
Good forums...