SSL certificate problem across all users

Yesterday, all users stopped being able to pull or push to/from gitlab due to an “SSL certificate problem: unable to get local issuer certificate”.
If it was just me, then I’d assume it was a local PC issue, but all users ran into this problem.
Does anyone know why?

Thanks.

I don’t know what gitlab did recently, but they seemed to have broken something…I just tried pulling other repos from gitlab and it doesn’t work. I just tried to pull a github repo and it does work.
Sorry gitlab, but I have to switch to github, other colleagues are dependent on this…