diff --git a/cf-uaac.gemspec b/cf-uaac.gemspec
index 540f697..9b37c8e 100644
--- a/cf-uaac.gemspec
+++ b/cf-uaac.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'simplecov-rcov', '~> 0.3.1'
   s.add_development_dependency 'ci_reporter', '~> 2.0'
   s.add_development_dependency 'ci_reporter_rspec', '~> 1.0'
-  s.add_runtime_dependency 'highline', '~> 2.0'
+  s.add_runtime_dependency 'highline', '>= 2', '< 4'
   s.add_runtime_dependency 'eventmachine', '~> 1.2'
   s.add_runtime_dependency 'launchy', '~> 2.5'
   s.add_runtime_dependency 'em-http-request', '~> 1.1', '>= 1.1.2'