diff --git a/airborne.gemspec b/airborne.gemspec
index d89b5bb..c9b3332 100644
--- a/airborne.gemspec
+++ b/airborne.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'rspec', '~> 3.8'
   s.add_runtime_dependency 'rest-client', '< 3.0', '>= 2.0.2'
   s.add_runtime_dependency 'rack-test', '< 2.0', '>= 1.1.0'
-  s.add_runtime_dependency 'rack'
+  s.add_runtime_dependency 'rack', '< 3.0', '>= 2.0.8'
   s.add_runtime_dependency 'activesupport'
   s.add_development_dependency 'webmock', '~> 3'
 end