Upgrade gem dependencies

Gemfile.devtools

@@ -1,33 +1,34 @@
 # encoding: utf-8
 
 group :development do
-  gem 'rake',  '~> 10.1.0'
-  gem 'rspec', '~> 2.14.1'
-  gem 'yard',  '~> 0.8.7'
+  gem 'rake',       '~> 10.2.1'
+  gem 'rspec',      '~> 2.14.1'
+  gem 'rspec-core', '~> 2.14.8'
+  gem 'yard',       '~> 0.8.7.4'
 
   platform :rbx do
     gem 'rubysl-singleton', '~> 2.0.0'
   end
 end
 
 group :yard do
-  gem 'kramdown', '~> 1.3.0'
+  gem 'kramdown', '~> 1.3.3'
 end
 
 group :guard do
-  gem 'guard',         '~> 2.3.0'
+  gem 'guard',         '~> 2.6.0'
   gem 'guard-bundler', '~> 2.0.0'
-  gem 'guard-rspec',   '~> 4.2.0'
-  gem 'guard-rubocop', '~> 1.0.0'
+  gem 'guard-rspec',   '~> 4.2.8'
+  gem 'guard-rubocop', '~> 1.0.2'
 
   # file system change event handling
-  gem 'listen',     '~> 2.4.0'
+  gem 'listen',     '~> 2.7.1'
   gem 'rb-fchange', '~> 0.0.6', require: false
-  gem 'rb-fsevent', '~> 0.9.3', require: false
-  gem 'rb-inotify', '~> 0.9.0', require: false
+  gem 'rb-fsevent', '~> 0.9.4', require: false
+  gem 'rb-inotify', '~> 0.9.3', require: false
 
   # notification handling
-  gem 'libnotify',               '~> 0.8.0', require: false
+  gem 'libnotify',               '~> 0.8.2', require: false
   gem 'rb-notifu',               '~> 0.0.4', require: false
   gem 'terminal-notifier-guard', '~> 1.5.3', require: false
 end
@@ -36,13 +37,14 @@ group :metrics do
   gem 'coveralls', '~> 0.7.0'
   gem 'flay',      '~> 2.4.0'
   gem 'flog',      '~> 4.2.0'
-  gem 'reek',      '~> 1.3.2'
-  gem 'rubocop',   '~> 0.16.0'
+  gem 'reek',      '~> 1.3.7'
+  gem 'rubocop',   '~> 0.19.1'
   gem 'simplecov', '~> 0.8.2'
   gem 'yardstick', '~> 0.9.9'
 
   platforms :mri do
-    gem 'mutant', '~> 0.3.4'
+    gem 'mutant',       '~> 0.5.8'
+    gem 'mutant-rspec', '~> 0.5.3'
   end
 
   platforms :ruby_19, :ruby_20 do
@@ -51,10 +53,10 @@ group :metrics do
 
   platform :rbx do
     gem 'json',               '~> 1.8.1'
-    gem 'racc',               '~> 1.4'
+    gem 'racc',               '~> 1.4.11'
     gem 'rubysl-logger',      '~> 2.0.0'
     gem 'rubysl-open-uri',    '~> 2.0.0'
-    gem 'rubysl-prettyprint', '~> 2.0.2'
+    gem 'rubysl-prettyprint', '~> 2.0.3'
   end
 end
 

descendants_tracker.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.test_files       = `git ls-files -- spec/unit`.split($/)
   gem.extra_rdoc_files = %w[LICENSE README.md CONTRIBUTING.md TODO]
 
-  gem.add_runtime_dependency('thread_safe', '~> 0.1.3')
+  gem.add_runtime_dependency('thread_safe', '~> 0.3', '>= 0.3.1')
 
-  gem.add_development_dependency('bundler', '~> 1.5', '>= 1.5.2')
+  gem.add_development_dependency('bundler', '~> 1.5', '>= 1.5.3')
 end