standby.gemspec in standby-4.0.0 vs standby.gemspec in standby-5.0.0

@@ -14,11 +14,13 @@
 
   gem.files         = `git ls-files`.split($/)
   gem.executables   = gem.files.grep(%r{^exe/}).map{ |f| File.basename(f) }
   gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
   gem.require_paths = ['lib']
+  gem.required_ruby_version = '>= 2.0'
 
-  gem.add_runtime_dependency 'activerecord', '>= 3.0.0'
+  gem.add_runtime_dependency 'activerecord', '>= 3.0.0', '< 8.0'
 
+  gem.add_development_dependency 'rake'
   gem.add_development_dependency 'rspec'
   gem.add_development_dependency 'sqlite3'
 end