diff --git a/routing_report.gemspec b/routing_report.gemspec
index f25be5f..a8ee93a 100644
--- a/routing_report.gemspec
+++ b/routing_report.gemspec
@@ -22,6 +22,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'terminal-table', '~> 1.8'
   spec.add_dependency 'activesupport', '~> 4'
+  spec.add_dependency 'unicode'
 
   spec.add_development_dependency "bundler", "~> 1.14"
   spec.add_development_dependency "rake", "~> 10.0"