running rake ci in hydra-head

gistfile1.txt

[Hydra CI] hydra-core
Running specs
rake aborted!
cannot load such file -- bundler/setup
/Users/adamw/Projects/Github/hydra-head/hydra-core/spec/internal/config/boot.rb:6:in `<top (required)>'
/Users/adamw/Projects/Github/hydra-head/hydra-core/spec/internal/config/application.rb:1:in `<top (required)>'
/Users/adamw/Projects/Github/hydra-head/hydra-core/spec/internal/Rakefile:5:in `<top (required)>'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/rake_module.rb:25:in `load'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/rake_module.rb:25:in `load_rakefile'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:589:in `raw_load_rakefile'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:89:in `block in load_rakefile'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:88:in `load_rakefile'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:72:in `block in run'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/Users/adamw/Projects/Github/hydra-head/.bundle/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
(See full trace by running task with --trace)
rake aborted!
cannot load such file -- bundler/setup