diff --git a/.rubocop.yml b/.rubocop.yml
index 13df3f99613..80eb4a5c19e 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -292,7 +292,8 @@ Style/MultilineMethodDefinitionBraceLayout:
 
 # Checks indentation of binary operations that span more than one line.
 Style/MultilineOperationIndentation:
-  Enabled: false
+  Enabled: true
+  EnforcedStyle: indented
 
 # Avoid multi-line `? :` (the ternary operator), use if/unless instead.
 Style/MultilineTernaryOperator:
diff --git a/app/controllers/jwt_controller.rb b/app/controllers/jwt_controller.rb
index c736200a104..c2e4d62b50b 100644
--- a/app/controllers/jwt_controller.rb
+++ b/app/controllers/jwt_controller.rb
@@ -26,7 +26,7 @@ class JwtController < ApplicationController
       @authentication_result = Gitlab::Auth.find_for_git_client(login, password, project: nil, ip: request.ip)
 
       render_unauthorized unless @authentication_result.success? &&
-        (@authentication_result.actor.nil? || @authentication_result.actor.is_a?(User))
+          (@authentication_result.actor.nil? || @authentication_result.actor.is_a?(User))
     end
   rescue Gitlab::Auth::MissingPersonalTokenError
     render_missing_personal_token
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 8c698695202..93a180b9036 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -114,7 +114,7 @@ class SessionsController < Devise::SessionsController
 
   def valid_otp_attempt?(user)
     user.validate_and_consume_otp!(user_params[:otp_attempt]) ||
-    user.invalidate_otp_backup_code!(user_params[:otp_attempt])
+      user.invalidate_otp_backup_code!(user_params[:otp_attempt])
   end
 
   def log_audit_event(user, options = {})
diff --git a/app/helpers/form_helper.rb b/app/helpers/form_helper.rb
index 6a43be2cf3e..1182939f656 100644
--- a/app/helpers/form_helper.rb
+++ b/app/helpers/form_helper.rb
@@ -7,12 +7,12 @@ module FormHelper
 
     content_tag(:div, class: 'alert alert-danger', id: 'error_explanation') do
       content_tag(:h4, headline) <<
-      content_tag(:ul) do
-        model.errors.full_messages.
-          map { |msg| content_tag(:li, msg) }.
-          join.
-          html_safe
-      end
+        content_tag(:ul) do
+          model.errors.full_messages.
+            map { |msg| content_tag(:li, msg) }.
+            join.
+            html_safe
+        end
     end
   end
 end
diff --git a/app/helpers/nav_helper.rb b/app/helpers/nav_helper.rb
index a3331dc80cb..e21178c7377 100644
--- a/app/helpers/nav_helper.rb
+++ b/app/helpers/nav_helper.rb
@@ -7,12 +7,12 @@ module NavHelper
 
   def page_gutter_class
     if current_path?('merge_requests#show') ||
-      current_path?('merge_requests#diffs') ||
-      current_path?('merge_requests#commits') ||
-      current_path?('merge_requests#builds') ||
-      current_path?('merge_requests#conflicts') ||
-      current_path?('merge_requests#pipelines') ||
-      current_path?('issues#show')
+        current_path?('merge_requests#diffs') ||
+        current_path?('merge_requests#commits') ||
+        current_path?('merge_requests#builds') ||
+        current_path?('merge_requests#conflicts') ||
+        current_path?('merge_requests#pipelines') ||
+        current_path?('issues#show')
       if cookies[:collapsed_gutter] == 'true'
         "page-gutter right-sidebar-collapsed"
       else
@@ -21,9 +21,9 @@ module NavHelper
     elsif current_path?('builds#show')
       "page-gutter build-sidebar right-sidebar-expanded"
     elsif current_path?('wikis#show') ||
-      current_path?('wikis#edit') ||
-      current_path?('wikis#history') ||
-      current_path?('wikis#git_access')
+        current_path?('wikis#edit') ||
+        current_path?('wikis#history') ||
+        current_path?('wikis#git_access')
       "page-gutter wiki-sidebar right-sidebar-expanded"
     end
   end
diff --git a/app/helpers/tab_helper.rb b/app/helpers/tab_helper.rb
index 563ddd2a511..547f6258909 100644
--- a/app/helpers/tab_helper.rb
+++ b/app/helpers/tab_helper.rb
@@ -106,9 +106,9 @@ module TabHelper
 
   def branches_tab_class
     if current_controller?(:protected_branches) ||
-      current_controller?(:branches) ||
-      current_page?(namespace_project_repository_path(@project.namespace,
-                                                      @project))
+        current_controller?(:branches) ||
+        current_page?(namespace_project_repository_path(@project.namespace,
+                                                        @project))
       'active'
     end
   end
diff --git a/app/models/member.rb b/app/models/member.rb
index 3b65587c66b..d29b3c68cf6 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -89,8 +89,8 @@ class Member < ActiveRecord::Base
       member =
         if user.is_a?(User)
           source.members.find_by(user_id: user.id) ||
-          source.requesters.find_by(user_id: user.id) ||
-          source.members.build(user_id: user.id)
+            source.requesters.find_by(user_id: user.id) ||
+            source.members.build(user_id: user.id)
         else
           source.members.build(invite_email: user)
         end
diff --git a/app/models/network/graph.rb b/app/models/network/graph.rb
index 345041a6ad1..b524ca50ee8 100644
--- a/app/models/network/graph.rb
+++ b/app/models/network/graph.rb
@@ -161,8 +161,8 @@ module Network
     def is_overlap?(range, overlap_space)
       range.each do |i|
         if i != range.first &&
-          i != range.last &&
-          @commits[i].spaces.include?(overlap_space)
+            i != range.last &&
+            @commits[i].spaces.include?(overlap_space)
 
           return true
         end
diff --git a/app/models/project_services/issue_tracker_service.rb b/app/models/project_services/issue_tracker_service.rb
index 207bb816ad1..bce2cdd5516 100644
--- a/app/models/project_services/issue_tracker_service.rb
+++ b/app/models/project_services/issue_tracker_service.rb
@@ -85,8 +85,8 @@ class IssueTrackerService < Service
 
   def enabled_in_gitlab_config
     Gitlab.config.issues_tracker &&
-    Gitlab.config.issues_tracker.values.any? &&
-    issues_tracker
+      Gitlab.config.issues_tracker.values.any? &&
+      issues_tracker
   end
 
   def issues_tracker
diff --git a/app/models/user.rb b/app/models/user.rb
index 1bd28203523..3f8bbbc425d 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -390,7 +390,7 @@ class User < ActiveRecord::Base
   def namespace_uniq
     # Return early if username already failed the first uniqueness validation
     return if errors.key?(:username) &&
-      errors[:username].include?('has already been taken')
+        errors[:username].include?('has already been taken')
 
     existing_namespace = Namespace.by_path(username)
     if existing_namespace && existing_namespace != namespace
diff --git a/app/policies/note_policy.rb b/app/policies/note_policy.rb
index 83847466ee2..5326061bd07 100644
--- a/app/policies/note_policy.rb
+++ b/app/policies/note_policy.rb
@@ -12,7 +12,7 @@ class NotePolicy < BasePolicy
     end
 
     if @subject.for_merge_request? &&
-       @subject.noteable.author == @user
+        @subject.noteable.author == @user
       can! :resolve_note
     end
   end
diff --git a/app/policies/project_policy.rb b/app/policies/project_policy.rb
index d5aadfce76a..b5db9c12622 100644
--- a/app/policies/project_policy.rb
+++ b/app/policies/project_policy.rb
@@ -3,7 +3,7 @@ class ProjectPolicy < BasePolicy
     team_access!(user)
 
     owner = project.owner == user ||
-            (project.group && project.group.has_owner?(user))
+      (project.group && project.group.has_owner?(user))
 
     owner_access! if user.admin? || owner
     team_member_owner_access! if owner
@@ -13,7 +13,7 @@ class ProjectPolicy < BasePolicy
       public_access!
 
       if project.request_access_enabled &&
-         !(owner || user.admin? || project.team.member?(user) || project_group_member?(user))
+          !(owner || user.admin? || project.team.member?(user) || project_group_member?(user))
         can! :request_access
       end
     end
@@ -244,10 +244,10 @@ class ProjectPolicy < BasePolicy
 
   def project_group_member?(user)
     project.group &&
-    (
-      project.group.members.exists?(user_id: user.id) ||
-      project.group.requesters.exists?(user_id: user.id)
-    )
+      (
+        project.group.members.exists?(user_id: user.id) ||
+        project.group.requesters.exists?(user_id: user.id)
+      )
   end
 
   def named_abilities(name)
diff --git a/app/services/groups/update_service.rb b/app/services/groups/update_service.rb
index 99ad12b1003..fff2273f402 100644
--- a/app/services/groups/update_service.rb
+++ b/app/services/groups/update_service.rb
@@ -5,7 +5,7 @@ module Groups
       new_visibility = params[:visibility_level]
       if new_visibility && new_visibility.to_i != group.visibility_level
         unless can?(current_user, :change_visibility_level, group) &&
-          Gitlab::VisibilityLevel.allowed_for?(current_user, new_visibility)
+            Gitlab::VisibilityLevel.allowed_for?(current_user, new_visibility)
 
           deny_visibility_level(group, new_visibility)
           return group
diff --git a/app/services/issues/update_service.rb b/app/services/issues/update_service.rb
index a2111b3806b..78cbf94ec69 100644
--- a/app/services/issues/update_service.rb
+++ b/app/services/issues/update_service.rb
@@ -10,7 +10,7 @@ module Issues
       end
 
       if issue.previous_changes.include?('title') ||
-         issue.previous_changes.include?('description')
+          issue.previous_changes.include?('description')
         todo_service.update_issue(issue, current_user)
       end
 
diff --git a/app/services/merge_requests/build_service.rb b/app/services/merge_requests/build_service.rb
index bebfca7537b..6a7393a9921 100644
--- a/app/services/merge_requests/build_service.rb
+++ b/app/services/merge_requests/build_service.rb
@@ -42,7 +42,7 @@ module MergeRequests
       end
 
       if merge_request.source_project == merge_request.target_project &&
-         merge_request.target_branch == merge_request.source_branch
+          merge_request.target_branch == merge_request.source_branch
 
         messages << 'You must select different branches'
       end
diff --git a/app/services/merge_requests/update_service.rb b/app/services/merge_requests/update_service.rb
index fda0da19d87..ad16ef8c70f 100644
--- a/app/services/merge_requests/update_service.rb
+++ b/app/services/merge_requests/update_service.rb
@@ -25,7 +25,7 @@ module MergeRequests
       end
 
       if merge_request.previous_changes.include?('title') ||
-         merge_request.previous_changes.include?('description')
+          merge_request.previous_changes.include?('description')
         todo_service.update_merge_request(merge_request, current_user)
       end
 
diff --git a/app/services/projects/update_service.rb b/app/services/projects/update_service.rb
index 921ca6748d3..8a6af8d8ada 100644
--- a/app/services/projects/update_service.rb
+++ b/app/services/projects/update_service.rb
@@ -6,7 +6,7 @@ module Projects
 
       if new_visibility && new_visibility.to_i != project.visibility_level
         unless can?(current_user, :change_visibility_level, project) &&
-          Gitlab::VisibilityLevel.allowed_for?(current_user, new_visibility)
+            Gitlab::VisibilityLevel.allowed_for?(current_user, new_visibility)
 
           deny_visibility_level(project, new_visibility)
           return project
diff --git a/config/initializers/sidekiq.rb b/config/initializers/sidekiq.rb
index 1d7a3f03ace..5a7365bb0f6 100644
--- a/config/initializers/sidekiq.rb
+++ b/config/initializers/sidekiq.rb
@@ -34,7 +34,7 @@ Sidekiq.configure_server do |config|
   # Database pool should be at least `sidekiq_concurrency` + 2
   # For more info, see: https://github.com/mperham/sidekiq/blob/master/4.0-Upgrade.md
   config = ActiveRecord::Base.configurations[Rails.env] ||
-                Rails.application.config.database_configuration[Rails.env]
+    Rails.application.config.database_configuration[Rails.env]
   config['pool'] = Sidekiq.options[:concurrency] + 2
   ActiveRecord::Base.establish_connection(config)
   Rails.logger.debug("Connection Pool size for Sidekiq Server is now: #{ActiveRecord::Base.connection.pool.instance_variable_get('@size')}")
diff --git a/lib/gitlab/email/reply_parser.rb b/lib/gitlab/email/reply_parser.rb
index 85402c2a278..f586c5ab062 100644
--- a/lib/gitlab/email/reply_parser.rb
+++ b/lib/gitlab/email/reply_parser.rb
@@ -69,7 +69,7 @@ module Gitlab
           # This one might be controversial but so many reply lines have years, times and end with a colon.
           # Let's try it and see how well it works.
           break if (l =~ /\d{4}/ && l =~ /\d:\d\d/ && l =~ /\:$/) ||
-                   (l =~ /On \w+ \d+,? \d+,?.*wrote:/)
+              (l =~ /On \w+ \d+,? \d+,?.*wrote:/)
 
           # Headers on subsequent lines
           break if (0..2).all? { |off| lines[idx + off] =~ REPLYING_HEADER_REGEX }
diff --git a/spec/lib/gitlab/gfm/reference_rewriter_spec.rb b/spec/lib/gitlab/gfm/reference_rewriter_spec.rb
index d619e401897..f4703dc704f 100644
--- a/spec/lib/gitlab/gfm/reference_rewriter_spec.rb
+++ b/spec/lib/gitlab/gfm/reference_rewriter_spec.rb
@@ -29,7 +29,7 @@ describe Gitlab::Gfm::ReferenceRewriter do
       context 'description with ignored elements' do
         let(:text) do
           "Hi. This references #1, but not `#2`\n" +
-          '<pre>and not !1</pre>'
+            '<pre>and not !1</pre>'
         end
 
         it { is_expected.to include issue_first.to_reference(new_project) }
diff --git a/spec/requests/api/projects_spec.rb b/spec/requests/api/projects_spec.rb
index c5d67a90abc..8304c408064 100644
--- a/spec/requests/api/projects_spec.rb
+++ b/spec/requests/api/projects_spec.rb
@@ -167,7 +167,7 @@ describe API::Projects, api: true  do
         expect(json_response).to satisfy do |response|
           response.one? do |entry|
             entry.has_key?('permissions') &&
-            entry['name'] == project.name &&
+              entry['name'] == project.name &&
               entry['owner']['username'] == user.username
           end
         end