bundle install (of a Rails application): see MarshalError: RuntimeError: can't modify a frozen object. rubinius 2.1.0.n267 (2.1.0 25638f94 2013-09-24 JI) [x86_64-darwin12.4.0]

bundle-install.log

$ bundle update --verbose
Fetching from: https://rubygems.org/api/v1/dependencies
HTTP Redirection
Fetching from: https://bundler.rubygems.org/api/v1/dependencies
HTTP Success
Fetching gem metadata from https://rubygems.org/
Query List: ["rails", "puma", "activerecord-jdbcpostgresql-adapter", "pg", "sass-rails", "uglifier", "coffee-rails", "compass-rails", "zurb-foundation", "kramdown", "nokogiri", "rails_config", "cinch", "cinch-identify", "html_truncator", "jquery-rails", "devise", "cancan", "simple_enum", "simple_form", "capistrano", "rvm-capistrano", "better_errors", "sdoc"]
Query Gemcutter Dependency Endpoint API: rails,puma,activerecord-jdbcpostgresql-adapter,pg,sass-rails,uglifier,coffee-rails,compass-rails,zurb-foundation,kramdown,nokogiri,rails_config,cinch,cinch-identify,html_truncator,jquery-rails,devise,cancan,simple_enum,simple_form,capistrano,rvm-capistrano,better_errors,sdoc
Fetching from: https://rubygems.org/api/v1/dependencies?gems=rails,puma,activerecord-jdbcpostgresql-adapter,pg,sass-rails,uglifier,coffee-rails,compass-rails,zurb-foundation,kramdown,nokogiri,rails_config,cinch,cinch-identify,html_truncator,jquery-rails,devise,cancan,simple_enum,simple_form,capistrano,rvm-capistrano,better_errors,sdoc
HTTP Redirection
Fetching from: https://bundler.rubygems.org/api/v1/dependencies?gems=rails,puma,activerecord-jdbcpostgresql-adapter,pg,sass-rails,uglifier,coffee-rails,compass-rails,zurb-foundation,kramdown,nokogiri,rails_config,cinch,cinch-identify,html_truncator,jquery-rails,devise,cancan,simple_enum,simple_form,capistrano,rvm-capistrano,better_errors,sdoc
HTTP Success
Error during API request. Bundler::MarshalError: RuntimeError: can't modify frozen object
/Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler.rb:303:in `load_marshal'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:243:in `fetch_dependency_remote_specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:151:in `fetch_remote_specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/fetcher.rb:106:in `specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/source/rubygems.rb:235:in `remote_specs'  kernel/bootstrap/array.rb:66:in `each'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/source/rubygems.rb:235:in `remote_specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/source/rubygems.rb:163:in `fetch_specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/source/rubygems.rb:67:in `specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:192:in `index'  kernel/bootstrap/array.rb:66:in `each'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:189:in `index'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/index.rb:9:in `build'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:185:in `index'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:179:in `resolve'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:114:in `specs'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/definition.rb:109:in `resolve_remotely!'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/installer.rb:83:in `run'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/installer.rb:14:in `install'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/cli.rb:320:in `update'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/task.rb:27:in `run'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/invocation.rb:120:in `invoke_task'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/vendor/thor.rb:344:in `dispatch'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/vendor/thor/base.rb:434:in `start'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/bin/bundle:20:in `__script__'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/lib/bundler/friendly_errors.rb:3:in `with_friendly_errors'  /Users/amos/.rvm/gems/rbx-head@global/gems/bundler-1.3.5/bin/bundle:20:in `__script__'  kernel/common/kernel.rb:427:in `load'  /Users/amos/.rvm/gems/rbx-head@global/bin/bundle:23:in `__script__'  kernel/delta/codeloader.rb:66:in `load_script'  kernel/delta/codeloader.rb:109:in `load_script'  kernel/loader.rb:643:in `script'  kernel/loader.rb:834:in `main'
Fetching source index from https://rubygems.org/