diff --git a/app/controllers/admin/email_controller.rb b/app/controllers/admin/email_controller.rb
index 40df9cb304a..8d706b7c033 100644
--- a/app/controllers/admin/email_controller.rb
+++ b/app/controllers/admin/email_controller.rb
@@ -48,7 +48,7 @@ class Admin::EmailController < Admin::AdminController
 
   def delivery_settings
     action_mailer_settings
-      .reject { |k, v| k == :password }
+      .reject { |k, _| k == :password }
       .map    { |k, v| { name: k, value: v }}
   end
 
diff --git a/app/jobs/regular/crawl_topic_link.rb b/app/jobs/regular/crawl_topic_link.rb
index 6501edb03ce..6c0bf6a9172 100644
--- a/app/jobs/regular/crawl_topic_link.rb
+++ b/app/jobs/regular/crawl_topic_link.rb
@@ -9,7 +9,7 @@ module Jobs
 
     # Retrieve a header regardless of case sensitivity
     def self.header_for(head, name)
-      header = head.headers.detect do |k, v|
+      header = head.headers.detect do |k, _|
         name == k.downcase
       end
       header[1] if header
@@ -65,7 +65,7 @@ module Jobs
       return "" unless uri
 
       result = ""
-      streamer = lambda do |chunk, remaining_bytes, total_bytes|
+      streamer = lambda do |chunk, _, _|
         result << chunk
 
         # Using exceptions for flow control is really bad, but there really seems to
diff --git a/app/models/post.rb b/app/models/post.rb
index d7514d36888..e31d611c9b1 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -206,7 +206,7 @@ class Post < ActiveRecord::Base
   def has_host_spam?
     return false if acting_user.present? && acting_user.has_trust_level?(:basic)
 
-    total_hosts_usage.each do |host, count|
+    total_hosts_usage.each do |_, count|
       return true if count >= SiteSetting.newuser_spam_host_threshold
     end
 
diff --git a/app/models/post_analyzer.rb b/app/models/post_analyzer.rb
index 7c38a8e2c97..dabb36733eb 100644
--- a/app/models/post_analyzer.rb
+++ b/app/models/post_analyzer.rb
@@ -11,7 +11,7 @@ class PostAnalyzer
   def cook(*args)
     cooked = PrettyText.cook(*args)
 
-    result = Oneboxer.apply(cooked) do |url, elem|
+    result = Oneboxer.apply(cooked) do |url, _|
       Oneboxer.invalidate(url) if args.last[:invalidate_oneboxes]
       Oneboxer.cached_onebox url
     end
diff --git a/app/models/topic_link.rb b/app/models/topic_link.rb
index a2270f39e9f..8a0c99c95ac 100644
--- a/app/models/topic_link.rb
+++ b/app/models/topic_link.rb
@@ -105,8 +105,8 @@ class TopicLink < ActiveRecord::Base
       PrettyText
         .extract_links(post.cooked)
         .map{|u| [u, URI.parse(u.url)] rescue nil}
-        .reject{|u,p| p.nil?}
-        .uniq{|u,p| p}
+        .reject{|_, p| p.nil?}
+        .uniq{|_, p| p}
         .each do |link, parsed|
         begin
 
diff --git a/app/models/user_action.rb b/app/models/user_action.rb
index 9a3c59a2338..4574a58752a 100644
--- a/app/models/user_action.rb
+++ b/app/models/user_action.rb
@@ -161,7 +161,7 @@ LEFT JOIN categories c on c.id = t.category_id
         # TODO there are conditions when this is called and user_id was already rolled back and is invalid.
 
         # protect against dupes, for some reason this is failing in some cases
-        action = self.find_by(hash.select { |k, v| required_parameters.include?(k) })
+        action = self.find_by(hash.select { |k, _| required_parameters.include?(k) })
         return action if action
 
         action = self.new(hash)
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 9734f9e6da7..e92ffa87a8f 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -38,7 +38,7 @@ Discourse::Application.configure do
 
     settings[:openssl_verify_mode] = GlobalSetting.smtp_openssl_verify_mode if GlobalSetting.smtp_openssl_verify_mode
 
-    config.action_mailer.smtp_settings = settings.reject{|x,y| y.nil?}
+    config.action_mailer.smtp_settings = settings.reject{|_, y| y.nil?}
   else
     config.action_mailer.delivery_method = :sendmail
     config.action_mailer.sendmail_settings = {arguments: '-i'}
diff --git a/lib/admin_user_index_query.rb b/lib/admin_user_index_query.rb
index 2b07fb20960..1568e1ff90a 100644
--- a/lib/admin_user_index_query.rb
+++ b/lib/admin_user_index_query.rb
@@ -18,7 +18,7 @@ class AdminUserIndexQuery
   end
 
   def filter_by_trust
-    levels = trust_levels.map { |key, value| key.to_s }
+    levels = trust_levels.map { |key, _| key.to_s }
     if levels.include?(params[:query])
       @query.where('trust_level = ?', trust_levels[params[:query].to_sym])
     end
diff --git a/lib/autospec/manager.rb b/lib/autospec/manager.rb
index e1052f8dd51..440961e0377 100644
--- a/lib/autospec/manager.rb
+++ b/lib/autospec/manager.rb
@@ -63,7 +63,7 @@ class Autospec::Manager
   def ensure_all_specs_will_run
     puts "@@@@@@@@@@@@ ensure_all_specs_will_run" if @debug
     @runners.each do |runner|
-      @queue << ['spec', 'spec', runner] unless @queue.any? { |f, s, r| s == "spec" && r == runner }
+      @queue << ['spec', 'spec', runner] unless @queue.any? { |_, s, r| s == "spec" && r == runner }
     end
   end
 
@@ -152,7 +152,7 @@ class Autospec::Manager
     end
 
     Thread.start do
-      Listen.to('.', options) do |modified, added, removed|
+      Listen.to('.', options) do |modified, added, _|
         process_change([modified, added].flatten.compact)
       end
     end
@@ -187,7 +187,7 @@ class Autospec::Manager
         end
       end
       # special watcher for styles/templates
-      Autospec::ReloadCss::WATCHERS.each do |k,v|
+      Autospec::ReloadCss::WATCHERS.each do |k, _|
         matches = []
         matches << file if k.match(file)
         Autospec::ReloadCss.run_on_change(matches) if matches.present?
@@ -220,7 +220,7 @@ class Autospec::Manager
       puts "@@@@@@@@@@@@ #{@queue}" if @debug
       specs.each do |file, spec, runner|
         # make sure there's no other instance of this spec in the queue
-        @queue.delete_if { |f, s, r| s.strip == spec.strip && r == runner }
+        @queue.delete_if { |_, s, r| s.strip == spec.strip && r == runner }
         # deal with focused specs
         if @queue.first && @queue.first[0] == "focus"
           focus = @queue.shift
diff --git a/lib/export/exporter.rb b/lib/export/exporter.rb
index 8a6debca15f..4de3e17b2ee 100644
--- a/lib/export/exporter.rb
+++ b/lib/export/exporter.rb
@@ -121,7 +121,7 @@ module Export
     end
 
     def sidekiq_has_running_jobs?
-      Sidekiq::Workers.new.each do |process_id, thread_id, worker|
+      Sidekiq::Workers.new.each do |_, _, worker|
         payload = worker.try(:payload)
         return true if payload.try(:all_sites)
         return true if payload.try(:current_site_id) == @current_db
diff --git a/lib/import/importer.rb b/lib/import/importer.rb
index 00ef164dd34..36e98718144 100644
--- a/lib/import/importer.rb
+++ b/lib/import/importer.rb
@@ -142,7 +142,7 @@ module Import
     end
 
     def sidekiq_has_running_jobs?
-      Sidekiq::Workers.new.each do |process_id, thread_id, worker|
+      Sidekiq::Workers.new.each do |_, _, worker|
         payload = worker.try(:payload)
         return true if payload.try(:all_sites)
         return true if payload.try(:current_site_id) == @current_db
diff --git a/lib/middleware/anonymous_cache.rb b/lib/middleware/anonymous_cache.rb
index 13c62adee3f..f80507ee510 100644
--- a/lib/middleware/anonymous_cache.rb
+++ b/lib/middleware/anonymous_cache.rb
@@ -84,7 +84,7 @@ module Middleware
         status,headers,response = result
 
         if status == 200 && cache_duration
-          headers_stripped = headers.dup.delete_if{|k,v| ["Set-Cookie","X-MiniProfiler-Ids"].include? k}
+          headers_stripped = headers.dup.delete_if{|k, _| ["Set-Cookie","X-MiniProfiler-Ids"].include? k}
           parts = []
           response.each do |part|
             parts << part
diff --git a/lib/post_destroyer.rb b/lib/post_destroyer.rb
index 56056925998..990bb114f1d 100644
--- a/lib/post_destroyer.rb
+++ b/lib/post_destroyer.rb
@@ -139,7 +139,7 @@ class PostDestroyer
     public_post_actions = PostAction.publics.where(post_id: @post.id)
     public_post_actions.each { |pa| pa.trash!(@user) }
 
-    f = PostActionType.public_types.map { |k,v| ["#{k}_count", 0] }
+    f = PostActionType.public_types.map { |k, _| ["#{k}_count", 0] }
     Post.with_deleted.where(id: @post.id).update_all(Hash[*f.flatten])
   end
 
diff --git a/lib/site_setting_extension.rb b/lib/site_setting_extension.rb
index 31a18c97c04..4e7aacfde6a 100644
--- a/lib/site_setting_extension.rb
+++ b/lib/site_setting_extension.rb
@@ -105,7 +105,7 @@ module SiteSettingExtension
 
   def settings_hash
     result = {}
-    @defaults.each do |s, v|
+    @defaults.each do |s, _|
       result[s] = send(s).to_s
     end
     result
@@ -124,7 +124,7 @@ module SiteSettingExtension
   # Retrieve all settings
   def all_settings(include_hidden=false)
     @defaults
-      .reject{|s, v| hidden_settings.include?(s) || include_hidden}
+      .reject{|s, _| hidden_settings.include?(s) || include_hidden}
       .map do |s, v|
         value = send(s)
         type = types[get_data_type(s, value)]
diff --git a/script/measure.rb b/script/measure.rb
index c4af5b96d16..d643625fb69 100644
--- a/script/measure.rb
+++ b/script/measure.rb
@@ -23,7 +23,7 @@ def profile_allocations(name)
   initial_size = ObjectSpace.count_objects
   yield
   changes = ObjectSpace.count_objects
-  changes.each do |k,v|
+  changes.each do |k, _|
     changes[k] -= initial_size[k]
   end
   puts "#{name} changes"