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-rw-r--r--actioncable/actioncable.gemspec1
1 files changed, 0 insertions, 1 deletions
diff --git a/actioncable/actioncable.gemspec b/actioncable/actioncable.gemspec
index b6e529e879..a04fc932aa 100644
--- a/actioncable/actioncable.gemspec
+++ b/actioncable/actioncable.gemspec
@@ -23,7 +23,6 @@ Gem::Specification.new do |s|
s.add_dependency 'coffee-rails', '~> 4.1.0'
s.add_dependency 'faye-websocket', '~> 0.10.0'
s.add_dependency 'websocket-driver', '~> 0.6.1'
- s.add_dependency 'concurrent-ruby', '~> 1.0.0'
s.add_dependency 'em-hiredis', '~> 0.3.0'
s.add_dependency 'redis', '~> 3.0'