diff --git a/Gemfile.devtools b/Gemfile.devtools
index e9cdcd60..10fc113e 100644
--- a/Gemfile.devtools
+++ b/Gemfile.devtools
@@ -1,7 +1,7 @@
 # encoding: utf-8
 
 group :development do
-  gem 'rake',  '~> 10.0.4'
+  gem 'rake',  '~> 10.1.0'
   gem 'rspec', '~> 2.13.0'
   gem 'yard',  '~> 0.8.6.1'
 end
@@ -11,12 +11,12 @@ group :yard do
 end
 
 group :guard do
-  gem 'guard',         '~> 1.8.0'
+  gem 'guard',         '~> 1.8.1'
   gem 'guard-bundler', '~> 1.0.0'
-  gem 'guard-rspec',   '~> 2.5.4'
+  gem 'guard-rspec',   '~> 3.0.2'
 
   # file system change event handling
-  gem 'listen',     '~> 1.0.2'
+  gem 'listen',     '~> 1.2.2'
   gem 'rb-fchange', '~> 0.0.6', :require => false
   gem 'rb-fsevent', '~> 0.9.3', :require => false
   gem 'rb-inotify', '~> 0.9.0', :require => false
@@ -28,13 +28,13 @@ group :guard do
 end
 
 group :metrics do
-  gem 'backports',       '~> 3.3', '>= 3.3.0'
-  gem 'coveralls',       '~> 0.6.6'
-  gem 'flay',            '~> 2.2.0'
-  gem 'flog',            '~> 4.0.0'
-  gem 'reek',            '~> 1.3.1', :git => 'https://github.com/troessner/reek.git'
-  gem 'simplecov',       '~> 0.7.1'
-  gem 'yardstick',       '~> 0.9.6'
+  gem 'backports', '~> 3.3', '>= 3.3.2'
+  gem 'coveralls', '~> 0.6.7'
+  gem 'flay',      '~> 2.3.0'
+  gem 'flog',      '~> 4.1.0'
+  gem 'reek',      '~> 1.3.1', :git => 'https://github.com/troessner/reek.git'
+  gem 'simplecov', '~> 0.7.1'
+  gem 'yardstick', '~> 0.9.6'
 
   platforms :ruby_19 do
     gem 'yard-spellcheck', '~> 0.1.5'