diff --git a/apex.gemspec b/apex.gemspec
index 663f559f5e2bbaca010733a9725d376cc08b631f..b2e0cc4462007d83ff62631d5a9c0b08d3a5aa01 100644
--- a/apex.gemspec
+++ b/apex.gemspec
@@ -36,4 +36,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'json'
   spec.add_dependency 'serialport'
   spec.add_dependency 'methadone'
+  spec.add_dependency 'colorize'
 end