diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index 4fdc697a154ff..0427022dc6a35 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -23,6 +23,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'i18n',       '~> 0.6', '>= 0.6.4'
   s.add_dependency 'json',       '~> 1.7', '>= 1.7.7'
   s.add_dependency 'tzinfo',     '~> 1.1'
-  s.add_dependency 'minitest',   '~> 5.0'
+  s.add_dependency 'minitest',   '~> 5.1'
   s.add_dependency 'thread_safe','~> 0.1'
 end