diff --git a/ad_banner.gemspec b/ad_banner.gemspec
index 562dce7..8ca17f1 100644
--- a/ad_banner.gemspec
+++ b/ad_banner.gemspec
@@ -65,6 +65,7 @@ Gem::Specification.new do |s|
   s.summary     = "Ad Banner management"
   s.description = "Create Banners for Orbit"
   s.license     = "MIT"
+  s.add_dependency('rubyzip', ["~> 1.3"])
 
   s.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.rdoc"]
   s.test_files = Dir["test/**/*"]