diff --git a/Gemfile b/Gemfile
index cc7f13e..edd6cf2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,6 @@ gem 'rake'
 gem 'rspec'
 gem 'multi_json', '1.0.4'
 gem 'simplecov', :require => false
-gem 'rubyzip'
+gem 'rubyzip', '~> 1.1'
 gem 'vcr'
 gem 'fakeweb'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0df9f4b..636ef0d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,6 +28,6 @@ DEPENDENCIES
   multi_json (= 1.0.4)
   rake
   rspec
-  rubyzip
+  rubyzip (~> 1.1)
   simplecov
   vcr
diff --git a/gtfs.gemspec b/gtfs.gemspec
index 25e6c6e..d6d4941 100644
--- a/gtfs.gemspec
+++ b/gtfs.gemspec
@@ -15,9 +15,11 @@ Gem::Specification.new do |gem|
   gem.email       = ['ed@nerded.net']
   gem.homepage    = 'https://github.com/nerdEd/gtfs'
 
+  gem.required_ruby_version = '>= 1.9.2'
+
   gem.add_dependency 'rake'
   gem.add_dependency 'multi_json'
-  gem.add_dependency 'rubyzip'
+  gem.add_dependency 'rubyzip', ['~> 1.1']
 
   gem.add_development_dependency 'rspec', ['>= 2.0.0']
   gem.add_development_dependency 'simplecov'
diff --git a/lib/gtfs/version.rb b/lib/gtfs/version.rb
index 2eae749..ac3b412 100644
--- a/lib/gtfs/version.rb
+++ b/lib/gtfs/version.rb
@@ -1,4 +1,3 @@
 module GTFS
-  VERSION = '0.2.3'
+  VERSION = '0.2.4'
 end
-