jekyll-toc.gemspec in jekyll-toc-0.12.2 vs jekyll-toc.gemspec in jekyll-toc-0.13.0

@@ -13,15 +13,15 @@
   spec.homepage      = 'https://github.com/toshimaru/jekyll-toc'
   spec.license       = 'MIT'
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.3'
+  spec.required_ruby_version = '>= 2.4'
 
   spec.add_runtime_dependency 'nokogiri', '~> 1.9'
 
   spec.add_development_dependency 'appraisal'
-  spec.add_development_dependency 'jekyll', '>= 3.5'
+  spec.add_development_dependency 'jekyll', '>= 3.7'
   spec.add_development_dependency 'minitest', '~> 5.11'
   spec.add_development_dependency 'minitest-reporters'
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rubocop'