coach.gemspec in coach-1.0.0 vs coach.gemspec in coach-2.0.0

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require "coach/version"
 
 Gem::Specification.new do |spec|
@@ -8,19 +10,20 @@
   spec.summary       = "Alternative controllers built with middleware"
   spec.authors       = %w[GoCardless]
   spec.homepage      = "https://github.com/gocardless/coach"
   spec.email         = %w[[e-mail]]
   spec.license       = "MIT"
-  spec.required_ruby_version = ">= 2.2"
+  spec.required_ruby_version = ">= 2.4"
 
   spec.files         = `git ls-files -z`.split("\x0")
   spec.test_files    = spec.files.grep(%r{^spec/})
   spec.require_paths = ["lib"]
 
   spec.add_dependency "actionpack", ">= 4.2"
   spec.add_dependency "activesupport", ">= 4.2"
 
+  spec.add_development_dependency "gc_ruboconfig", "= 2.4.0"
   spec.add_development_dependency "pry", "~> 0.10"
   spec.add_development_dependency "rspec", "~> 3.2"
   spec.add_development_dependency "rspec-its", "~> 1.2"
-  spec.add_development_dependency "rspec_junit_formatter", "~> 0.3.0"
+  spec.add_development_dependency "rspec_junit_formatter", "~> 0.4.0"
 end