diff --git a/lib/openvpn-status-web.rb b/lib/openvpn-status-web.rb
index 589145e..a02ec90 100755
--- a/lib/openvpn-status-web.rb
+++ b/lib/openvpn-status-web.rb
@@ -107,7 +107,7 @@ module OpenVPNStatusWeb
       if config['logfile']
         OpenVPNStatusWeb.logger = Logger.new(config['logfile'])
       else
-        OpenVPNStatusWeb.logger = Logger.new(STDOUT)
+        OpenVPNStatusWeb.logger = Logger.new($stdout)
       end
 
       OpenVPNStatusWeb.logger.progname = 'openvpn-status-web'
diff --git a/openvpn-status-web.gemspec b/openvpn-status-web.gemspec
index 989aeb7..1b16bb8 100644
--- a/openvpn-status-web.gemspec
+++ b/openvpn-status-web.gemspec
@@ -36,6 +36,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
-  s.add_development_dependency 'rubocop', '~> 0.88.0'
+  s.add_development_dependency 'rubocop', '~> 0.89.0'
   s.add_development_dependency 'solargraph'
 end