diff --git a/gemfiles/rails_6.1.gemfile b/gemfiles/rails_6.1.gemfile
index ee84ef38..b11b8047 100644
--- a/gemfiles/rails_6.1.gemfile
+++ b/gemfiles/rails_6.1.gemfile
@@ -2,6 +2,7 @@ source "https://rubygems.org"
 
 gem "puma", "~> 5.6"
 gem "traces", "~> 0.9.1"
+gem "concurrent-ruby", "1.3.4" # https://github.com/rails/rails/pull/54264
 
 ENV["RAILS_VERSION"] = "6.1"
 
diff --git a/spec/support/example_app_helper.rb b/spec/support/example_app_helper.rb
index 82a0c8dc..0f626a0b 100644
--- a/spec/support/example_app_helper.rb
+++ b/spec/support/example_app_helper.rb
@@ -11,7 +11,12 @@ def setup_example_app
 
     root_path = example_app_path.join('..')
     FileUtils.cd(root_path) do
-      system("rails new #{app_name} -d postgresql --skip-action-text --skip-action-mailer --skip-action-mailbox --skip-action-cable --skip-git --skip-sprockets --skip-listen --skip-javascript --skip-turbolinks --skip-solid --skip-kamal --skip-system-test --skip-test-unit --skip-bootsnap --skip-spring --skip-active-storage")
+      system <<~BASH, exception: true
+        bundle exec rails new #{app_name} -d postgresql \
+        --skip-action-text --skip-action-mailer --skip-action-mailbox --skip-action-cable --skip-git --skip-sprockets \
+        --skip-listen --skip-javascript --skip-turbolinks --skip-solid --skip-kamal --skip-system-test --skip-test-unit \
+        --skip-bootsnap --skip-spring --skip-active-storage
+      BASH
     end
 
     FileUtils.rm_rf("#{example_app_path}/config/initializers/assets.rb")