Hello! I’ve been trying to upgrade from Ruby 1.8.6 to ruby 2.2.2 at my
workplace, and as expected its been a bit rough. 
I have a old 2.0.5 rails application that needs to keep working, and
I’ve ran into a bit of a roadblock with the ActionMailer having a syntax
error. However the problem is fixed in the 2.3.18 version of the gem.
Is it possible to tell rails 2.0.5 to use the 2.3.18 gem for action
mailer only? I haven’t been able to find anything about using different
versions of the gems so I’m suspecting not, but it would be great to
know how.
On Thursday, 14 May 2015 14:37:53 UTC-4, Ruby-Forum.com User wrote:
versions of the gems so I’m suspecting not, but it would be great to
know how. 
The odds aren’t great that such a thing would work; the internals were
moving around a lot between versions back then.
Unrelated: you may have already done this, but make SURE you’ve patched
the
JSON parser to close these holes:
CVE-2013-0156:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0156
CVE-2013-0333:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0333
I doubt these are the only security vulnerabilities in 2.0.5, but these
two
are some of the nastiest.
–Matt J.
Thanks, figured as much. Oh well.