diff --git a/railties/railties.gemspec b/railties/railties.gemspec
index 207739c4bc..6d28947e83 100644
--- a/railties/railties.gemspec
+++ b/railties/railties.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.rdoc_options << '--exclude' << '.'
 
   s.add_dependency('rake',          '>= 0.8.7')
-  s.add_dependency('thor',          '>= 0.15.3', '< 2.0')
+  s.add_dependency('thor',          '>= 0.15.4', '< 2.0')
   s.add_dependency('rdoc',          '~> 3.4')
   s.add_dependency('activesupport', version)
   s.add_dependency('actionpack',    version)