diff --git a/Gemfile.devtools b/Gemfile.devtools
index 8096b9ca..cd400235 100644
--- a/Gemfile.devtools
+++ b/Gemfile.devtools
@@ -1,5 +1,5 @@
-group :development do 
-  gem 'rake',    '~> 0.9.2'
+group :development do
+  gem 'rake',    '~> 10.0'
   gem 'rspec',   '~> 2.12.0'
   gem 'yard',    '~> 0.8.3'
 end
@@ -26,22 +26,15 @@ group :metrics do
   gem 'flog',      '~> 2.5.1'
   gem 'reek',      '~> 1.2.8', :git => 'https://github.com/dkubb/reek.git'
   gem 'roodi',     '~> 2.1.0'
-  gem 'yardstick', '~> 0.7.0'
-  gem 'simplecov'
+  gem 'yardstick', '~> 0.8.0'
 
   platforms :ruby_18, :ruby_19 do
     # this indirectly depends on ffi which does not build on ruby-head
     gem 'yard-spellcheck', '~> 0.1.5'
   end
 
-  platforms :mri_18 do
-    gem 'arrayfields', '~> 4.7.4'  # for metric_fu
-    gem 'fattr',       '~> 2.2.0'  # for metric_fu
-    gem 'json',        '~> 1.7.3'  # for metric_fu rake task
-    gem 'map',         '~> 6.0.1'  # for metric_fu
-    gem 'metric_fu',   '~> 2.1.1'
-    gem 'mspec',       '~> 1.5.17'
-    gem 'rcov',        '~> 1.0.0'
+  platforms :mri_19 do
+    gem 'simplecov',   '~> 0.7'
   end
 
   platforms :rbx do