How to disable SSL Algorithms option in rails with thin server for HTTPS?

I had issue with my HTTPS web application which not open on safari browser.

After that i get feedback from SSL service provider that we need to disable low security Algorithms.

I have my hosted application with thin server not with apache. can some one help me how to disable low security Algorithms with rails thin server.

As per SSL provider he expect me to disable below Algorithms

SHA-1 / RSA WEAK (SLOTH attack )
SHA-1 / DSA WEAK (SLOTH attack )
SHA-1 / ECDSA   WEAK (SLOTH attack )