From f509ad3c72ed55d9fb35848664a771815aa4599b Mon Sep 17 00:00:00 2001
From: Matthew Draper <matthew@trebex.net>
Date: Mon, 5 Jun 2017 06:25:46 +0930
Subject: Test concurrency of visitor superclass fallback

---
 arel.gemspec | 1 +
 1 file changed, 1 insertion(+)

(limited to 'arel.gemspec')

diff --git a/arel.gemspec b/arel.gemspec
index 9cbf991ab7..1e3fbfd49a 100644
--- a/arel.gemspec
+++ b/arel.gemspec
@@ -23,4 +23,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency('minitest', '~> 5.4')
   s.add_development_dependency('rdoc', '~> 4.0')
   s.add_development_dependency('rake')
+  s.add_development_dependency('concurrent-ruby', '~> 1.0')
 end
-- 
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