diff --git a/.rubocop.yml b/.rubocop.yml
index d7a8c488..cdfb67d2 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -59,8 +59,6 @@ Style/MethodMissingSuper:
   Enabled: false
 Style/FrozenStringLiteralComment:
   Enabled: false
-Style/FormatStringToken:
-  Enabled: false
 Style/EvalWithLocation:
   Enabled: false
 Style/Lambda:
diff --git a/middleman-core/lib/middleman-core/preview_server.rb b/middleman-core/lib/middleman-core/preview_server.rb
index 22ff0c23..93331642 100644
--- a/middleman-core/lib/middleman-core/preview_server.rb
+++ b/middleman-core/lib/middleman-core/preview_server.rb
@@ -42,9 +42,9 @@ module Middleman
 
         app.logger.debug %(== Server information is provided by #{server_information.handler})
         app.logger.debug %(== The Middleman is running in "#{environment}" environment)
-        app.logger.debug format('== The Middleman preview server is bound to %s', ServerUrl.new(hosts: server_information.listeners, port: server_information.port, https: server_information.https?).to_bind_addresses.join(', '))
-        app.logger.info format('== View your site at %s', ServerUrl.new(hosts: server_information.site_addresses, port: server_information.port, https: server_information.https?).to_urls.join(', '))
-        app.logger.info format('== Inspect your site configuration at %s', ServerUrl.new(hosts: server_information.site_addresses, port: server_information.port, https: server_information.https?).to_config_urls.join(', '))
+        app.logger.debug format('== The Middleman preview server is bound to %<url>s', url: ServerUrl.new(hosts: server_information.listeners, port: server_information.port, https: server_information.https?).to_bind_addresses.join(', '))
+        app.logger.info format('== View your site at %<url>s', url: ServerUrl.new(hosts: server_information.site_addresses, port: server_information.port, https: server_information.https?).to_urls.join(', '))
+        app.logger.info format('== Inspect your site configuration at %<url>s', url: ServerUrl.new(hosts: server_information.site_addresses, port: server_information.port, https: server_information.https?).to_config_urls.join(', '))
 
         @initialized ||= false
         return if @initialized
@@ -187,7 +187,13 @@ module Middleman
                                server_name: possible_from_cli(:server_name, app.config),
                                https: possible_from_cli(:https, app.config))
 
-        app.logger.warn format('== The Middleman uses a different port "%s" then the configured one "%s" because some other server is listening on that port.', server_information.port, configured_port) unless server_information.port == configured_port
+        unless server_information.port == configured_port
+          app.logger.warn format(
+            '== The Middleman uses a different port "%<new_port>s" then the configured one "%<old_port>s" because some other server is listening on that port.',
+            new_port: server_information.port,
+            old_port: configured_port
+          )
+        end
 
         @environment = possible_from_cli(:environment, app.config)
 
diff --git a/middleman-core/lib/middleman-core/preview_server/checks.rb b/middleman-core/lib/middleman-core/preview_server/checks.rb
index a8f1a9f4..6f36b79b 100644
--- a/middleman-core/lib/middleman-core/preview_server/checks.rb
+++ b/middleman-core/lib/middleman-core/preview_server/checks.rb
@@ -34,7 +34,11 @@ module Middleman
           return if resolver.ips_for(information.server_name).include? information.bind_address
 
           information.valid = false
-          information.reason = format('Server name "%s" does not resolve to bind address "%s"', information.server_name, information.bind_address)
+          information.reason = format(
+            'Server name "%<name>s" does not resolve to bind address "%<addr>s"',
+            name: information.server_name,
+            addr: information.bind_address
+          )
         end
       end
 
@@ -49,7 +53,11 @@ module Middleman
           return if information.bind_address.blank? || information.local_network_interfaces.include?(information.bind_address.to_s) || %w[0.0.0.0 ::].any? { |b| information.bind_address == b } || IPAddr.new('127.0.0.0/8').include?(information.bind_address.to_s)
 
           information.valid = false
-          information.reason = format('Bind address "%s" is not available on your system. Please use one of %s', information.bind_address, information.local_network_interfaces.map { |i| %("#{i}") }.join(', '))
+          information.reason = format(
+            'Bind address "%<bad_addr>s" is not available on your system. Please use one of %<good_addrs>s',
+            bad_addr: information.bind_address,
+            good_addrs: information.local_network_interfaces.map { |i| %("#{i}") }.join(', ')
+          )
         end
       end
 
@@ -61,7 +69,10 @@ module Middleman
           return unless information.bind_address.blank?
 
           information.valid = false
-          information.reason = format('Server name "%s" does not resolve to an ip address', information.server_name)
+          information.reason = format(
+            'Server name "%<name>s" does not resolve to an ip address',
+            name: information.server_name
+          )
         end
       end
 
diff --git a/middleman-core/lib/middleman-core/preview_server/server_ip_address.rb b/middleman-core/lib/middleman-core/preview_server/server_ip_address.rb
index 55a83db5..7d3c290c 100644
--- a/middleman-core/lib/middleman-core/preview_server/server_ip_address.rb
+++ b/middleman-core/lib/middleman-core/preview_server/server_ip_address.rb
@@ -32,7 +32,7 @@ module Middleman
       end
 
       def to_browser
-        format('[%s]', to_s)
+        format('[%<addr>s]', addr: to_s)
       end
 
       if RUBY_VERSION < '2'
diff --git a/middleman-core/lib/middleman-core/preview_server/server_url.rb b/middleman-core/lib/middleman-core/preview_server/server_url.rb
index a3bd7757..f77adc7c 100644
--- a/middleman-core/lib/middleman-core/preview_server/server_url.rb
+++ b/middleman-core/lib/middleman-core/preview_server/server_url.rb
@@ -23,9 +23,9 @@ module Middleman
       #   List of bind addresses of format host:port
       def to_bind_addresses
         if format_output
-          hosts.map { |l| format('"%s:%s"', l.to_s, port) }
+          hosts.map { |l| format('"%<host>s:%<port>s"', host: l.to_s, port: port) }
         else
-          hosts.map { |l| format('%s:%s', l.to_s, port) }
+          hosts.map { |l| format('%<host>s:%<port>s', host: l.to_s, port: port) }
         end
       end
 
@@ -35,9 +35,23 @@ module Middleman
       #   List of urls of format http://host:port
       def to_urls
         if format_output
-          hosts.map { |l| format('"%s://%s:%s"', https? ? 'https' : 'http', l.to_browser, port) }
+          hosts.map do |l|
+            format(
+              '"%<protocol>s://%<host>s:%<port>s"',
+              protocol: https? ? 'https' : 'http',
+              host: l.to_browser,
+              port: port
+            )
+          end
         else
-          hosts.map { |l| format('%s://%s:%s', https? ? 'https' : 'http', l.to_browser, port) }
+          hosts.map do |l|
+            format(
+              '%<protocol>s://%<host>s:%<port>s',
+              protocol: https? ? 'https' : 'http',
+              host: l.to_browser,
+              port: port
+            )
+          end
         end
       end
 
@@ -47,9 +61,23 @@ module Middleman
       #   List of urls of format http://host:port/__middleman
       def to_config_urls
         if format_output
-          hosts.map { |l| format('"%s://%s:%s/__middleman"', https? ? 'https' : 'http', l.to_browser, port) }
+          hosts.map do |l|
+            format(
+              '"%<protocol>s://%<host>s:%<port>s/__middleman"',
+              protocol: https? ? 'https' : 'http',
+              host: l.to_browser,
+              port: port
+            )
+          end
         else
-          hosts.map { |l| format('%s://%s:%s/__middleman', https? ? 'https' : 'http', l.to_browser, port) }
+          hosts.map do |l|
+            format(
+              '%<protocol>s://%<host>s:%<port>s/__middleman',
+              protocol: https? ? 'https' : 'http',
+              host: l.to_browser,
+              port: port
+            )
+          end
         end
       end