diff --git a/linguist.gemspec b/linguist.gemspec
index b9a8b174..275dd0ec 100644
--- a/linguist.gemspec
+++ b/linguist.gemspec
@@ -6,8 +6,9 @@ Gem::Specification.new do |s|
   s.files = Dir['lib/**/*']
   s.executables << 'linguist'
 
-  s.add_dependency 'escape_utils', '~> 0.2.3'
-  s.add_dependency 'mime-types',   '~> 1.16'
-  s.add_dependency 'pygments.rb',  '~> 0.2.1'
+  s.add_dependency 'charlock_holmes', '~> 0.6.6'
+  s.add_dependency 'escape_utils',    '~> 0.2.3'
+  s.add_dependency 'mime-types',      '~> 1.16'
+  s.add_dependency 'pygments.rb',     '~> 0.2.1'
   s.add_development_dependency 'rake'
 end