diff --git a/.rubocop.yml b/.rubocop.yml
index 12793ef90..a89826970 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -3,6 +3,9 @@ AllCops:
     - 'db/migrate/20151210035820_init_schema.rb'
     - 'db/schema.rb'
 
+Bundler/OrderedGems:
+  Enabled: false
+
 Lint/BlockAlignment:
   Exclude:
     - 'lib/tasks/db.rake'
@@ -29,6 +32,9 @@ Lint/Void:
 Metrics/AbcSize:
   Max: 160
 
+Metrics/BlockLength:
+  Enabled: false
+
 Metrics/ClassLength:
   Max: 500
   Exclude:
@@ -134,6 +140,9 @@ Style/EmptyLinesAroundMethodBody:
 Style/EmptyLinesAroundModuleBody:
   Enabled: false
 
+Style/EmptyMethod:
+  Enabled: false
+
 Style/ExtraSpacing:
   Exclude:
     - 'bin/setup'
diff --git a/bin/setup b/bin/setup
index da92a1ec1..8abb67303 100755
--- a/bin/setup
+++ b/bin/setup
@@ -58,7 +58,7 @@ Dir.chdir APP_ROOT do
 
   require 'yaml'
   require 'erb'
-  db_config = YAML.load(ERB.new(File.read("config/database.yml")).result)
+  db_config = YAML.safe_load(ERB.new(File.read("config/database.yml")).result)
   if File.exist?(db_config['development']['database'])
     puts "Database already exists, running migrations..."
     system "bin/rake db:migrate"
diff --git a/config/application.rb b/config/application.rb
index 3da7b4b16..f7ef4ebbc 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -37,7 +37,7 @@ class Application < Rails::Application
     config.middleware.insert_before 0, "Rack::Cors" do
       allow do
         origins 'bridgefoundry.org'
-        resource '/events.json', :headers => :any, :methods => [:get]
+        resource '/events.json', headers: :any, methods: [:get]
       end
     end
   end
diff --git a/spec/models/event_spec.rb b/spec/models/event_spec.rb
index 9a3a3125b..fc9a9dbe3 100644
--- a/spec/models/event_spec.rb
+++ b/spec/models/event_spec.rb
@@ -477,10 +477,6 @@
       @session1 = @event.event_sessions.first
       @session2 = create(:event_session, event: @event)
 
-      def deep_copy(o)
-        Marshal.load(Marshal.dump(o))
-      end
-
       expectation = {
         Role::VOLUNTEER.id => {
           @session1.id => [],
@@ -491,8 +487,8 @@ def deep_copy(o)
           @session2.id => []
         }
       }
-      @rsvps = deep_copy(expectation)
-      @checkins = deep_copy(expectation)
+      @rsvps = expectation.deep_dup
+      @checkins = expectation.deep_dup
 
       def add_rsvp(factory, session_checkins, additional_rsvp_options = {})
         rsvp_options = {