diff --git a/Gemfile.devtools b/Gemfile.devtools
index 16f7a10c..46d73064 100644
--- a/Gemfile.devtools
+++ b/Gemfile.devtools
@@ -30,7 +30,6 @@ group :guard do
 end
 
 group :metrics do
-  gem 'backports', '~> 2.7.0'
   gem 'flay',      '~> 1.4.3'
   gem 'flog',      '~> 2.5.3'
   gem 'reek',      '~> 1.2.13', :git => 'https://github.com/troessner/reek.git', :ref => 'ef77fcecaa21c9ebcbe4d9a79d41b0e70196bf18'
diff --git a/mutant.gemspec b/mutant.gemspec
index 9b2361a3..bc5de5c8 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -15,13 +15,13 @@ Gem::Specification.new do |gem|
   gem.extra_rdoc_files = %w[TODO LICENSE]
   gem.executables       = [ 'mutant' ]
 
+  gem.add_runtime_dependency('backports',           '~> 2.8.2')
   gem.add_runtime_dependency('to_source',           '~> 0.2.14')
-  gem.add_runtime_dependency('ice_nine',            '~> 0.6.0')
+  gem.add_runtime_dependency('ice_nine',            '~> 0.7.0')
   gem.add_runtime_dependency('descendants_tracker', '~> 0.0.1')
-  gem.add_runtime_dependency('backports',           '~> 2.7.0')
-  gem.add_runtime_dependency('adamantium',          '~> 0.0.5')
+  gem.add_runtime_dependency('adamantium',          '~> 0.0.6')
+  gem.add_runtime_dependency('equalizer',           '~> 0.0.4')
   gem.add_runtime_dependency('inflecto',            '~> 0.0.2')
-  gem.add_runtime_dependency('equalizer',           '~> 0.0.1')
-  gem.add_runtime_dependency('abstract_type',       '~> 0.0.2')
+  gem.add_runtime_dependency('abstract_type',       '~> 0.0.3')
   gem.add_runtime_dependency('diff-lcs',            '~> 1.1.3')
 end