louis.gemspec in louis-2.1.9 vs louis.gemspec in louis-2.2.0

@@ -17,10 +17,10 @@
 
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
     `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
   end
 
-  spec.required_ruby_version = '>= 2.1'
+  spec.required_ruby_version = '>= 2.4'
 
   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']