diff --git a/.rubocop.yml b/.rubocop.yml
index 6f17481..91f8916 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -25,9 +25,6 @@ Naming/FileName:
     - 'blacklight-access_controls.gemspec'
     - 'lib/blacklight-access_controls.rb'
 
-Rails:
-  Enabled: true
-
 RSpec/MessageSpies:
   Enabled: false
 
diff --git a/Gemfile b/Gemfile
index d2b760d..be408df 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,8 +4,8 @@ source 'https://rubygems.org'
 gemspec
 
 # BEGIN ENGINE_CART BLOCK
-# engine_cart: 0.10.0
-# engine_cart stanza: 0.10.0
+# engine_cart: 2.4.0
+# engine_cart stanza: 2.5.0
 # the below comes from engine_cart, a gem used to test this Rails engine gem in the context of a Rails app.
 file = File.expand_path('Gemfile', ENV['ENGINE_CART_DESTINATION'] || ENV['RAILS_ROOT'] || File.expand_path('.internal_test_app', File.dirname(__FILE__)))
 if File.exist?(file)
@@ -25,15 +25,16 @@ else
     else
       gem 'rails', ENV['RAILS_VERSION']
     end
-  end
 
-  case ENV['RAILS_VERSION']
-  when /^4.2/
-    gem 'coffee-rails', '~> 4.1.0'
-    gem 'responders', '~> 2.0'
-    gem 'sass-rails', '>= 5.0'
-  when /^4.[01]/
-    gem 'sass-rails', '< 5.0'
+    case ENV['RAILS_VERSION']
+    when /^6.0/
+      gem 'sass-rails', '>= 6'
+      gem 'webpacker', '~> 4.0'
+    when /^5.[12]/
+      gem 'sass-rails', '~> 5.0'
+      gem 'sprockets', '~> 3.7'
+      gem 'thor', '~> 0.20'
+    end
   end
 end
 # END ENGINE_CART BLOCK
diff --git a/Rakefile b/Rakefile
index 6fb4efc..dcc619d 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 begin
   require 'bundler/setup'
 rescue LoadError
diff --git a/blacklight-access_controls.gemspec b/blacklight-access_controls.gemspec
index 897d993..5ea9ce9 100644
--- a/blacklight-access_controls.gemspec
+++ b/blacklight-access_controls.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'factory_bot_rails', '~> 4.8'
   gem.add_development_dependency 'rake', '~> 12.3'
   gem.add_development_dependency 'rspec', '~> 3.1'
-  gem.add_development_dependency 'rubocop', '~> 0.52.1'
+  gem.add_development_dependency 'rubocop', '~> 1.29'
   gem.add_development_dependency 'rubocop-rspec'
   gem.add_development_dependency 'solr_wrapper'
 end