Unable to get local issuer certificate

I have deployed an API application on fly.io. The application is made in Rust with Rocket and a Mongo Atlas db. One of the post routes is requesting a website and I am getting this error (on fly.io only and not locally):
error while getting url on year 2024 and week 1: error sending request for url (https://jump.fandom.com/wiki/Weekly_Shonen_Jump_Issue_1,_2024): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:../ssl/statem/statem_clnt.c:1916: (unable to get local issuer certificate)

Is there something I can do about this?

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