Rails 2.3.5 → 2.3.8 にする

config/environment.rb

RAILS_GEM_VERSION = '2.3.5' unless defined? RAILS_GEM_VERSION

↓

RAILS_GEM_VERSION = '2.3.8' unless defined? RAILS_GEM_VERSION

rake rails:update:configs  # Update config/boot.rb from your current rails install

エラーが起きた

DEPRECATION WARNING: Rake tasks in vendor/plugins/forgot_password/tasks and vendor/plugins/restful-authentication/tasks are deprecated. Use lib/tasks instead. (called from /Users/takezi/local/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/tasks/rails.rb:10)

plugins/*/tasks/*.rake

をリネームして回避