Appraisals in routemaster-drain-2.3.0 vs Appraisals in routemaster-drain-2.4.0

@@ -1,11 +1,11 @@
 appraise "rails-3" do
-  gem "rails", "3.2.14"
+  gem "rails", "~> 3.2"
 end
 
 appraise "rails-4" do
-  gem "rails", "4.0.0"
+  gem "rails", "~> 4.2"
 end
 
 appraise "rails-5" do
-  gem "rails", "5.0.0"
+  gem "rails", "~> 5.0"
 end