# Upgrading from Rails 1.2.6

**URL:** <https://www.ruby-forum.com/t/upgrading-from-rails-1-2-6/171780>\
**Category:** Rails\
**Created:** [July 9, 2009, 3:53am UTC](https://www.ruby-forum.com/t/upgrading-from-rails-1-2-6/171780 "2009-07-09T03:53:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![shusseina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d78d45/32.png) [@shusseina](https://www.ruby-forum.com/u/shusseina)\
**Post date:** [July 9, 2009, 3:53am UTC](https://www.ruby-forum.com/t/upgrading-from-rails-1-2-6/171780/1 "2009-07-09T03:53:38Z")

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I’m a Rails newbie. Currently my Mac is running Rails 1.2.6.

I would like to know how to upgrade to Rails 2.0.2. How do I ensure  
my existing Rails apps are also upgraded?

Thanks

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**Author:** ![shusseina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d78d45/32.png) [@shusseina](https://www.ruby-forum.com/u/shusseina)\
**Post date:** [July 9, 2009, 4:01am UTC](https://www.ruby-forum.com/t/upgrading-from-rails-1-2-6/171780/2 "2009-07-09T04:01:13Z")

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Your existing apps will not be upgraded after you upgrade your Rails  
version.  
You should upgrade them by hand.

First, modify your config/environment.rb

# Modify following line

# RAILS\_GEM\_VERSION = ‘1.2.6’ unless defined? RAILS\_GEM\_VERSION

RAILS\_GEM\_VERSION = ‘2.0.2’ unless defined? RAILS\_GEM\_VERSION

Then, save it and close it, run your terminal and go to the project  
path and run the command:

rake rails:update

¦b 2009/7/9 ¤W¤È 9:52 ®É¡A shusseina ¼g¨ì¡G

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<div class="post-metadata">

**Author:** ![shusseina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d78d45/32.png) [@shusseina](https://www.ruby-forum.com/u/shusseina)\
**Post date:** [July 9, 2009, 5:13am UTC](https://www.ruby-forum.com/t/upgrading-from-rails-1-2-6/171780/3 "2009-07-09T05:13:39Z")

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Thanks for that!