diff --git a/mutant.gemspec b/mutant.gemspec
index 01cf983d..512b01ae 100644
--- a/mutant.gemspec
+++ b/mutant.gemspec
@@ -26,6 +26,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency('parser',        '~> 2.1')
   gem.add_runtime_dependency('ast',           '~> 2.0')
   gem.add_runtime_dependency('diff-lcs',      '~> 1.2')
+  gem.add_runtime_dependency('parallel',      '~> 1.3')
   gem.add_runtime_dependency('morpher',       '~> 0.2.3')
   gem.add_runtime_dependency('procto',        '~> 0.0.2')
   gem.add_runtime_dependency('abstract_type', '~> 0.0.7')
@@ -37,7 +38,6 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency('inflecto',      '~> 0.0.2')
   gem.add_runtime_dependency('anima',         '~> 0.2.0')
   gem.add_runtime_dependency('concord',       '~> 0.1.5')
-  gem.add_runtime_dependency('parallel',      '~> 1.2.0')
 
   gem.add_development_dependency('bundler', '~> 1.3', '>= 1.3.5')
 end