[chef] Excon::Errors::SocketError Unable to verify certificate

My newly launched nodes started failing in their route53 recipe last nite with
this error:

FATAL: Excon::Errors::SocketError:
route53_record[chef-ci-web.dev.needtogetmyoontzon.com]
(resolver::default line 128) had an error: Excon::Errors::SocketError:
Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path]
= path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, or
`Excon.defaults[:ssl_verify_peer] = false` (less secure).

On such a system, I see:

/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/excon-0.25.0

On a system launched only a couple days ago, I see

/opt/chef/embedded/lib/ruby/gems/1.9.1/gems/excon-0.24.0

I see 0.25.0 changed the behavior of how it finds certs:
https://github.com/geemus/excon/blob/master/changelog.txt

I'm not sure if I should bug geemus, or the chef community. In the meantime,
I'm gonna see if I can pin my clients to 0.24.0 so we're not stuck on this.

kallen