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-rw-r--r--actionpack/actionpack.gemspec1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index 1bba9df969..7830242af5 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -26,6 +26,7 @@ Gem::Specification.new do |s|
s.add_dependency 'rails-html-sanitizer', '~> 1.0', '>= 1.0.2'
s.add_dependency 'rails-dom-testing', '~> 1.0', '>= 1.0.5'
s.add_dependency 'actionview', version
+ s.add_dependency 'concurrent-ruby', '~> 0.9.0'
s.add_development_dependency 'activemodel', version
end