diff --git a/Gemfile.lock b/Gemfile.lock
index 76571f7..bcc6c7a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ PATH
     gtfs (0.4.1)
       multi_json
       rake
-      rubyzip (~> 1.1)
+      rubyzip (~> 2.3)
 
 GEM
   remote: https://rubygems.org/
@@ -38,7 +38,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    rubyzip (1.3.0)
+    rubyzip (2.3.2)
     simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
diff --git a/gtfs.gemspec b/gtfs.gemspec
index 77d1ce2..39a27c0 100644
--- a/gtfs.gemspec
+++ b/gtfs.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |gem|
 
   gem.add_dependency 'rake'
   gem.add_dependency 'multi_json'
-  gem.add_dependency 'rubyzip', ['~> 1.1']
+  gem.add_dependency 'rubyzip', ['~> 2.3']
 
   gem.add_development_dependency 'rspec', ['>= 2.0.0']
   gem.add_development_dependency 'simplecov'