Upgrade to Ruby 2.4

[luisramos0]

What we should change and why (this is tech debt)

We need to move forward with Ruby version so we can keep upgrading all other dependencies and also benefit from the so many improvements that come with latest Ruby versions, security and performance.

Context

I think this was briefly discussed here:
#4518 (comment)
We should probably try ruby 2.4 after we are on rails 4.1 #5386

Impact and timeline

After rails 4.1 or maybe only after rails 4.2.

[tsara27]

Hello @luisramos0

I have experience in upgrading Ruby application. Can I take this issue?

[luisramos0]

Hi @tsara27 welcome to OFN, join us on slack!
This upgrade can only be done after the upgrade to Rails 4.1.
I'd recommend you look for the label good-first-issue where we list issues that are good to start with the code base.

[tsara27]

I will do @luisramos0. Thanks!

[luisramos0]

ruby 2.4 brings support OpenSSL 1.1.0
I wonder if that will help with some local setup issues we have had with openssl...

[luisramos0]

not blocked any longer.
I think we can use 2.4.4 (semaphore upper 2.4 versions just like 2.3.8... "RC platform only").

[sauloperez]

We've been running on Ruby 2.4 for some weeks. So far, so good!