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-rw-r--r--activesupport/activesupport.gemspec3
1 files changed, 2 insertions, 1 deletions
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index 12c6a4d449..93878518d7 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -24,5 +24,6 @@ Gem::Specification.new do |s|
s.add_dependency 'json', '~> 1.7', '>= 1.7.7'
s.add_dependency 'tzinfo', '~> 1.1'
s.add_dependency 'minitest', '~> 5.1'
- s.add_dependency 'thread_safe','~> 0.3', '>= 0.3.4'
+ s.add_dependency 'concurrent-ruby', '~> 1.0.0.pre3', '< 2.0.0'
+ s.add_dependency 'method_source'
end