Upgrade the OpenSSL PHP uses

Can someone please shed some light on how to safely upgrade OpenSSL used by PHP? It seems I need to recompile and install PHP with the new version of OpenSSL but I'm unsure on how to proceed. As of now I have two different versions of OpenSSL, one for the system - and one for PHP. Please advice, any help is appreciated.

`forge@myserver:~$ openssl version -v OpenSSL 1.0.2l 25 May 2017

forge@myserver:~$ php -i | grep "SSL Version" SSL Version => OpenSSL/1.0.1f`