Error message encountered when running @bundle update@ from my Redmine installation directory:

Gem::InstallError: mime-types-data requires Ruby version >= 2.0.
An error occurred while installing mime-types-data (3.2016.0221), and Bundler cannot continue.
Make sure that `gem install mime-types-data -v '3.2016.0221'` succeeds before bundling.

Redmine installation details (taken once I restored the installation directory from backup):

sh: 1: darcs: not found
sh: 1: cvs: not found
sh: 1: bzr: not found
Environment:
  Redmine version                3.2.0.stable.14966
  Ruby version                   1.9.3-p0 (2011-10-30) [i686-linux]
  Rails version                  4.2.5.1
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.6.17
  Mercurial                      2.0.2
  Git                            1.7.9.5
  Filesystem
Redmine plugins:
  no plugin installed

Does Redmine still support Ruby 1.9.3? I looked at the RedmineInstall page and it is still listed there. From what I can recall you guys don't have a habit of switching requirements in the middle of maintaining a branch, so I figured this was something that folks just haven't reported yet.

P.S.

I use a Subversion tag for the installation. I then just switch tags when it is time to upgrade to a new version and then run the applicable upgrade steps.