It's now possible to run Rails 2.1 apps on Heroku.  Just change your
config/environment.rb to contain:

RAILS_GEM_VERSION = '2.1'

We'll be supporting 2.0.2 for the foreseeable future, but I encourage
you to try 2.1 when you get the chance.  Most apps should require
little or no porting work.

You might wonder why it took so long, since it seems like just a
simple matter of installing the new gems on the app servers.  It was
actually much more complex than this, because we maintain our own fork
of Rails in order to make it work within the unique constraints of the
Heroku platform.  The good news is that many of the things we did
order to make both versions work - like porting a lot of our
customizations to Rack middleware - are things that will make our
platform more robust over the long term as well.  That means, among
other things, that future versions of Rails will be much easier to
support and will be available much more quickly.

Please give it a try, and if you're so inclined, post here about how it went!

Adam

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