Hubspot PHP API cURL error 60: Peer's Certificate issuer is not recognized

I am using this hubspot-php package in my php laravel v5 project.

It connects to hubspot and fetches deals. I have tested it locally and it works fine on my local machine. But when I pushed it to my production / live server (i.e., ec2-instance [centos 7] running via apache). It throws this error:

cURL error 60: Peer's Certificate issuer is not recognized. (see https://ift.tt/1mgwZgQ)

with status code: 500 ..

can anyone please help me fix this issue?

Thanks.

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