With the imminent upgrade in Dreamhost to Rails 2.1.1 (dreamhost blog post here), you may want to freeze your Rails version to a previous version, using capistrano.
On your local development pc freeze the rails:
Add the new code to your svn repository:
svn commit -m 'freeze rails'
And then deploy to dreamhost using capistrano:
Your rails project located on dreamhost should be frozen to your current Rails version.