I am installing gems in my Gemfile in shared path as Capistrano does by default, and when I run:

bundle exec rake assets:precompile RAILS_ENV=production

I get:

You have already activated rake 0.9.2.2, but your Gemfile requires rake 10.0.4. Using bundle exec may solve this.

See that:

cat Gemfile.lock | grep rake

returns:

  rake (>= 0.8.7)
rake (10.0.4)

This is my gem environment output:

  - RUBYGEMS VERSION: 1.8.24
  - RUBY VERSION: 1.9.3 (2013-06-27 patchlevel 448) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/bitnami/my_app/shared/bundle/ruby/1.9.1/
  - RUBY EXECUTABLE: /opt/bitnami/ruby/bin/ruby
  - EXECUTABLE DIRECTORY: /home/bitnami/my_app/shared/bundle/ruby/1.9.1/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/bitnami/my_app/shared/bundle/ruby/1.9.1/
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gemhome" => "/home/bitnami/my_app/shared/bundle/ruby/1.9.1/"
     - "gempath" => ["/home/bitnami/my_app/shared/bundle/ruby/1.9.1/"]
  - REMOTE SOURCES:
     - http://rubygems.org/

Update

which -a rake
/opt/bitnami/rvm/bin/rake
/opt/bitnami/ruby/bin/rake

Update 2

I tried giving full path to rake, but same problem