diff --git a/wayback_machine_downloader.gemspec b/wayback_machine_downloader.gemspec
index af7c662..aefe102 100644
--- a/wayback_machine_downloader.gemspec
+++ b/wayback_machine_downloader.gemspec
@@ -14,5 +14,6 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 1.9.2'
   s.add_development_dependency 'pry-rescue', '~> 1.4'
   s.add_development_dependency 'pry-stack_explorer', '~> 0.4'
-  s.add_development_dependency 'rake', '~> 10.0'
+  s.add_development_dependency 'rake', '~> 10.2'
+  s.add_development_dependency 'minitest', '~> 5.2'
 end