Gemfile in citeproc-ruby-1.0.5 vs Gemfile in citeproc-ruby-1.0.6

@@ -4,19 +4,25 @@
 #gem 'citeproc', :github => 'inukshuk/citeproc.git'
 #gem 'csl', :github => 'inukshuk/csl-ruby.git'
 
 group :development, :test do
   gem 'rake', '~>10.0'
-  gem 'rspec', '~>3.0'
+  gem 'rspec', '~>3.0', '<3.2'
   gem 'cucumber', '~>1.2'
   gem 'simplecov', '~>0.8'
   gem 'rubinius-coverage', :platforms => :rbx
   gem 'coveralls', :require => false
 end
 
 group :debug do
+  if RUBY_VERSION >= '2.0'
+    gem 'byebug', :require => false, :platforms => :mri
+  else
+    gem 'debugger', :require => false, :platforms => :mri
+  end
+
   gem 'ruby-debug', :require => false, :platforms => :jruby
-  gem 'debugger', :require => false, :platforms => :mri_19
+
   gem 'rubinius-debugger', :require => false, :platforms => :rbx
   gem 'rubinius-compiler', :require => false, :platforms => :rbx
 end
 
 group :optional do