diff --git a/tinymce-rails-documentupload.gemspec b/tinymce-rails-documentupload.gemspec
index db43af5..c2eb92e 100644
--- a/tinymce-rails-documentupload.gemspec
+++ b/tinymce-rails-documentupload.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
   s.test_files    = []
   s.require_paths = ["lib"]
 
-  s.add_runtime_dependency     "railties",      ">= 3.2", "< 5"
+  s.add_runtime_dependency     "railties",      ">= 3.2", "< 6"
   s.add_runtime_dependency     "tinymce-rails", "~> 4.0"
   s.add_development_dependency "bundler",       "~> 1.0"
   s.add_development_dependency "rails",         ">= 3.1"