diff --git a/devise.gemspec b/devise.gemspec
index f1e1ec51..d958b4a2 100644
--- a/devise.gemspec
+++ b/devise.gemspec
@@ -23,6 +23,6 @@ Gem::Specification.new do |s|
   s.add_dependency("warden", "~> 1.2.3")
   s.add_dependency("orm_adapter", "~> 0.1")
   s.add_dependency("bcrypt", "~> 3.0")
-  s.add_dependency("railties", ">= 4.1.0", "< 5.2")
+  s.add_dependency("railties", ">= 4.1.0", "< 6.1")
   s.add_dependency("responders")
 end