grape-app.gemspec in grape-app-0.6.3 vs grape-app.gemspec in grape-app-0.6.4

@@ -1,8 +1,8 @@
 Gem::Specification.new do |s| # rubocop:disable Metrics/BlockLength
   s.name          = 'grape-app'
-  s.version       = '0.6.3'
+  s.version       = '0.6.4'
   s.authors       = ['Black Square Media Ltd']
   s.email         = ['[e-mail]']
   s.summary       = %(Stanalone Grape API apps)
   s.description   = %()
   s.homepage      = 'https://github.com/bsm/grape-app'
@@ -10,10 +10,10 @@
 
   s.files         = `git ls-files -z`.split("\x0").reject {|f| f.match(%r{^spec/}) }
   s.test_files    = `git ls-files -z -- spec/*`.split("\x0")
   s.executables   = ['grape-app']
   s.require_paths = ['lib']
-  s.required_ruby_version = '>= 2.3'
+  s.required_ruby_version = '>= 2.4'
 
   s.add_dependency 'activesupport'
   s.add_dependency 'grape', '>= 1.2.0'
   s.add_dependency 'grape-entity'
   s.add_dependency 'rack-cors'