diff --git a/Gemfile.devtools b/Gemfile.devtools
index 2cccdc0e..d7e140d5 100644
--- a/Gemfile.devtools
+++ b/Gemfile.devtools
@@ -7,7 +7,7 @@ group :development do
 end
 
 group :yard do
-  gem 'kramdown', '~> 1.1.0'
+  gem 'kramdown', '~> 1.2.0'
 end
 
 group :guard do
@@ -34,7 +34,7 @@ group :metrics do
   gem 'flay',      '~> 2.4.0'
   gem 'flog',      '~> 4.1.1'
   gem 'reek',      '~> 1.3.2'
-  gem 'rubocop',   '~> 0.11.0'
+  gem 'rubocop',   '~> 0.13.0'
   gem 'simplecov', '~> 0.7.1'
   gem 'yardstick', '~> 0.9.7', git: 'https://github.com/dkubb/yardstick.git'
 
diff --git a/mutant.gemspec b/mutant.gemspec
index 123b3966..24c3f238 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -19,8 +19,8 @@ Gem::Specification.new do |gem|
   gem.executables      = %w[mutant]
 
   gem.add_runtime_dependency('parser',              '~> 2.0.0.pre7')
-  gem.add_runtime_dependency('unparser',            '~> 0.1.1')
-  gem.add_runtime_dependency('ice_nine',            '~> 0.8')
+  gem.add_runtime_dependency('unparser',            '~> 0.1.2')
+  gem.add_runtime_dependency('ice_nine',            '~> 0.9')
   gem.add_runtime_dependency('descendants_tracker', '~> 0.0.1')
   gem.add_runtime_dependency('adamantium',          '~> 0.1.0')
   gem.add_runtime_dependency('equalizer',           '~> 0.0.7')