diff --git a/prome.gemspec b/prome.gemspec
index ad19e67..3b1cce1 100644
--- a/prome.gemspec
+++ b/prome.gemspec
@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
 
-  spec.add_dependency "rails", "> 5.0.0"
+  spec.add_dependency "rails", "> 4.1.0"
   spec.add_dependency "prometheus-client", "0.6.0"
 end