diff --git a/Gemfile b/Gemfile
index f19ac8b..d94e7f4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,5 @@ gemspec
 
 if RUBY_VERSION < '2.2'
   gem 'rack', '< 2'
+  gem 'rails', '< 5'
 end
diff --git a/sir_trevor_rails.gemspec b/sir_trevor_rails.gemspec
index 6a96bb5..eb634cb 100644
--- a/sir_trevor_rails.gemspec
+++ b/sir_trevor_rails.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "capybara"
   spec.add_development_dependency "launchy"
 
-  spec.add_dependency "rails", ">= 3", "< 5"
+  spec.add_dependency "rails", ">= 3", "< 6"
   spec.add_dependency "redcarpet", ">= 2.0.1", "< 4"
   spec.add_dependency "twitter-text", "~> 1.4"
   spec.add_dependency 'multi_json', '~> 1.0'