SSL_connect returned=1 errno=0 state=error: certificate verify failed in Mac

I have a rails app integrated with a third party web service. It has been working perfectly since the initial development for years. For some unexpected reason, suddenly it has stopped working. I would say we haven´t changed anything in our code. The only thing that it can be related is the fact that our SSL certificate expired and we renewed it.

The fact is that I´m getting this error when calling the web service request:

E, [2022-02-17T19:53:25.385435 #32501] ERROR -- : SSL_connect returned=1 errno=0 state=error: certificate verify failed
E, [2022-02-17T19:53:25.385876 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/httpi-2.4.4/lib/httpi/adapter/httpclient.rb:28:in `rescue in request'
E, [2022-02-17T19:53:25.386103 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/httpi-2.4.4/lib/httpi/adapter/httpclient.rb:24:in `request'
E, [2022-02-17T19:53:25.386358 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/httpi-2.4.4/lib/httpi.rb:161:in `request'
E, [2022-02-17T19:53:25.386658 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/httpi-2.4.4/lib/httpi.rb:127:in `get'
E, [2022-02-17T19:53:25.386909 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/resolver.rb:43:in `load_from_remote'
E, [2022-02-17T19:53:25.387150 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/resolver.rb:33:in `resolve'
E, [2022-02-17T19:53:25.387349 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/document.rb:142:in `xml'
E, [2022-02-17T19:53:25.387606 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/document.rb:160:in `parse'
E, [2022-02-17T19:53:25.387887 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/document.rb:147:in `parser'
E, [2022-02-17T19:53:25.388162 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/wasabi-3.5.0/lib/wasabi/document.rb:64:in `soap_actions'
E, [2022-02-17T19:53:25.388432 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/savon-2.12.0/lib/savon/operation.rb:22:in `ensure_exists!'
E, [2022-02-17T19:53:25.388696 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/savon-2.12.0/lib/savon/operation.rb:15:in `create'
E, [2022-02-17T19:53:25.388955 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/savon-2.12.0/lib/savon/client.rb:32:in `operation'
E, [2022-02-17T19:53:25.389214 #32501] ERROR -- : /Users/Rober/.rvm/gems/ruby-2.4.9/gems/savon-2.12.0/lib/savon/client.rb:36:in `call'

I´m not skilled at all with certificates. So, I found this post: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed and basically I´m trying almost everything that I see, but nothing is working. I have the issue in development on Mac running ruby 2.4.9p362 (2019-10-02 revision 67824) [x86_64-darwin19] and Rails 5.2.4 and also in production in Ubuntu. But, I will try to fix it in development first.