Gemfile in flapjack-0.8.11 vs Gemfile in flapjack-0.8.12

@@ -18,8 +18,8 @@
   gem 'rb-fsevent'
   gem 'guard-rspec'
   gem 'guard-cucumber'
   gem 'fuubar'
   gem 'simplecov', :require => false
-  gem 'debugger-ruby_core_source', '>= 1.3.2' # required for perftools
+  gem 'debugger-ruby_core_source', '>= 1.3.4' # required for perftools
   gem 'perftools.rb'
 end