diff --git a/Gemfile b/Gemfile
index 7909cb17..6cf60e0e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -55,6 +55,7 @@ gem 'chinese_pinyin'
 # gem 'sunspot'
 # gem 'progress_bar'
 gem  'ansi'
+gem 'diff-lcs', '~> 1.3'
 
 gem 'kaminari'
 gem 'elasticsearch-model'