sparrow.gemspec in cp-sparrow-0.0.14 vs sparrow.gemspec in cp-sparrow-0.0.15

@@ -1,8 +1,9 @@
 # coding: utf-8
 lib = File.expand_path('../lib', __FILE__)
-rails_version = ENV["RAILS_VERSION"] || "3.2.21"
+rails_version = ENV["RAILS_VERSION"] || "4.2.6"
+ruby_version = File.open(File.join(__dir__, '.ruby-version')).read.chomp
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'sparrow/version'
 
 Gem::Specification.new do |spec|
   spec.name        = "cp-sparrow"
@@ -15,21 +16,22 @@
 such as camelCase and snake_case. Both converting responses and requests are
 supported.
   }
   spec.homepage    = "https://github.com/GateprotectGmbH/sparrow"
   spec.license     = "MIT"
+  spec.required_ruby_version = ">= #{ruby_version}"
 
   spec.files         = `git ls-files -z`.split("\x0")
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency "activesupport", ">= 3.2.17"
+  spec.add_runtime_dependency "activesupport", "<= 4.2.6"
+
   spec.add_development_dependency "pry"
   spec.add_development_dependency "bundler", "~> 1.5"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec", '~> 3'
   spec.add_development_dependency "rspec-its"
   spec.add_development_dependency "rack-test"
-  spec.add_development_dependency "multi_json"
   spec.add_development_dependency "rails", rails_version
 end