diff --git a/rackstash.gemspec b/rackstash.gemspec
index 573270e..11ed1ca 100644
--- a/rackstash.gemspec
+++ b/rackstash.gemspec
@@ -38,7 +38,6 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_dependency 'concurrent-ruby', '~> 1.0', '>= 1.0.2'
-  spec.add_dependency 'ref', '~> 2.0'
 
   spec.add_development_dependency 'bundler', '~> 1.12'
   spec.add_development_dependency 'rake', '~> 10.0'