diff --git a/Gemfile b/Gemfile
index de93719e..9fb37224 100644
--- a/Gemfile
+++ b/Gemfile
@@ -151,3 +151,38 @@ else
   end
 end
 # END ENGINE_CART BLOCK
+# BEGIN ENGINE_CART BLOCK
+# engine_cart: 2.6.0
+# 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)
+  begin
+    eval_gemfile file
+  rescue Bundler::GemfileError => e
+    Bundler.ui.warn '[EngineCart] Skipping Rails application dependencies:'
+    Bundler.ui.warn e.message
+  end
+else
+  Bundler.ui.warn "[EngineCart] Unable to find test application dependencies in #{file}, using placeholder dependencies"
+
+  if ENV['RAILS_VERSION']
+    if ENV['RAILS_VERSION'] == 'edge'
+      gem 'rails', github: 'rails/rails'
+      ENV['ENGINE_CART_RAILS_OPTIONS'] = '--edge --skip-turbolinks'
+    else
+      gem 'rails', ENV['RAILS_VERSION']
+    end
+
+    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/trln_argon.gemspec b/trln_argon.gemspec
index 1cf0bfda..cbb864f8 100644
--- a/trln_argon.gemspec
+++ b/trln_argon.gemspec
@@ -29,11 +29,11 @@ Gem::Specification.new do |s|
   s.add_dependency 'library_stdnums', '~> 1.6'
   s.add_dependency 'openurl', '~>1.0'
   s.add_dependency 'font-awesome-rails', '~> 4.7'
-  s.add_dependency 'chosen-rails', '~> 1.10'
   s.add_dependency 'coffee-rails', '~> 4.2'
   s.add_dependency 'rsolr', '>= 1.0', '< 3'
   s.add_dependency 'addressable', '~> 2.5'
   s.add_dependency 'sprockets', '~> 4.0'
+  s.add_dependency 'trln-chosen-rails', '~> 1.20'
 
   # no version specified for sqlite3 because engine_cart 2.2
   # will otherwise use an incompatible version when generating