How i can make update asterisk 11 to 13 last version?

Hi all,

I Have version asterisk 11.1.2 but i want to make update to the last version , asterisk 13
how i can do that ?

i dont install new version becouse i use sangoma cards , sangoma cards have a pach for use gsm cards and go only version asterisk 11.1.2.

sameone can help me?