rekkyo.gemspec in rekkyo-1.0.0 vs rekkyo.gemspec in rekkyo-1.1.0

@@ -17,21 +17,26 @@
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
   spec.metadata["changelog_uri"] = "https://github.com/yujideveloper/rekkyo/tree/master/CHANGELOG.md"
 
+  spec.metadata["rubygems_mfa_required"] = "true"
+
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files = Dir.chdir(File.expand_path(__dir__)) do
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   end
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.required_ruby_version = ">= 2.5"
+
+  spec.add_development_dependency "appraisal", ">= 2.4.1"
   spec.add_development_dependency "bundler", ">= 1.16"
   spec.add_development_dependency "pry", ">= 0.12.2"
   spec.add_development_dependency "pry-doc", ">= 0.13.5"
   spec.add_development_dependency "rake", "~> 12.3"
   spec.add_development_dependency "rspec", "~> 3.8"
-  spec.add_development_dependency "rubocop", ">= 0.61.1"
+  spec.add_development_dependency "rubocop", ">= 1.25.0"
 end