diff --git a/linguist.gemspec b/linguist.gemspec
index a350bdfc..d313ff4c 100644
--- a/linguist.gemspec
+++ b/linguist.gemspec
@@ -9,4 +9,5 @@ Gem::Specification.new do |s|
   s.add_dependency 'albino',       '1.3.2'
   s.add_dependency 'escape_utils', '0.2.3'
   s.add_dependency 'mime-types',   '1.15'
+  s.add_development_dependency 'rake'
 end