diff --git a/openvpn-status-web.gemspec b/openvpn-status-web.gemspec
index 214c48f..d5aaa98 100644
--- a/openvpn-status-web.gemspec
+++ b/openvpn-status-web.gemspec
@@ -1,5 +1,5 @@
 
-$:.push File.expand_path("../lib", __FILE__)
+$LOAD_PATH.push File.expand_path('lib', __dir__)
 
 require 'openvpn-status-web/version'
 
@@ -8,22 +8,22 @@ Gem::Specification.new do |s|
   s.version = OpenVPNStatusWeb::VERSION
   s.summary = 'openvpn-status-web'
   s.description = 'Small Rack (Ruby) application serving OpenVPN status file.'
-  s.author  = 'Christian Nicolai'
+  s.author = 'Christian Nicolai'
   s.email = 'chrnicolai@gmail.com'
-  s.license = 'Apache License Version 2.0'
-  s.homepage  = 'https://github.com/cmur2/openvpn-status-web'
+  s.homepage = 'https://github.com/cmur2/dyndnsd'
+  s.license = 'Apache-2.0'
 
-  s.files = `git ls-files`.split($/)
+  s.files = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   s.test_files = s.files.grep(%r{^(test|spec|features)/})
-
   s.require_paths = ['lib']
-
   s.executables = ['openvpn-status-web']
 
-  s.add_runtime_dependency 'rack'
+  s.required_ruby_version = '>= 2.3'
+
+  s.add_runtime_dependency 'rack', '~> 2.0'
   s.add_runtime_dependency 'metriks'
 
-  s.add_development_dependency 'bundler', '~> 1.3'
+  s.add_development_dependency 'bundler'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'rack-test'