diff --git a/i18n.gemspec b/i18n.gemspec
index a320dbc6..e70edbb2 100644
--- a/i18n.gemspec
+++ b/i18n.gemspec
@@ -20,5 +20,5 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = '>= 1.3.5'
   s.required_ruby_version = '>= 1.9.3'
 
-  s.add_dependency 'concurrent-ruby', '1.0.2'
+  s.add_dependency 'concurrent-ruby', '~> 1.0'
 end