uninitialized constant ActiveJob::Serializers

[Onikoroshi]

I am attempting to update an older Rails app to run on the heroku-20 stack. I'm running Rails 5.1.1 and shopify-money 1.1.2. It works locally, and everything seemed to deploy correctly to heroku, but when I attempt to start up the application, I get the following error:

gems/shopify-money-1.1.2/lib/money/rails/job_argument_serializer.rb:5:in '<module:Rails>': uninitialized constant ActiveJob::Serializers (NameError)

I get a more complete error message when I attempt to reload the database:

heroku run bundle exec rake db:reload -a kiddocloud-staging
Running bundle exec rake db:reload on ⬢ kiddocloud-staging... up, run.3483 (Eco)
W, [2023-05-04T22:55:19.644207 #2]  WARN -- sentry: ** [Raven] You are running on Heroku but haven't enabled Dyno Metadata. For Sentry's release detection to work correctly, please run `heroku labs:enable runtime-dyno-metadata`
D, [2023-05-04T22:55:19.708017 #2] DEBUG -- : uninitialized constant ActiveJob::Serializers excluded from capture: DSN not set
rake aborted!
NameError: uninitialized constant ActiveJob::Serializers
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/rails/job_argument_serializer.rb:5:in `<module:Rails>'
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/rails/job_argument_serializer.rb:4:in `<class:Money>'
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/rails/job_argument_serializer.rb:3:in `<top (required)>'
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/railtie.rb:7:in `require_relative'
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/railtie.rb:7:in `block (2 levels) in <class:Railtie>'
/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.1.1/lib/active_support/lazy_load_hooks.rb:45:in `instance_eval'
/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.1.1/lib/active_support/lazy_load_hooks.rb:45:in `execute_hook'
/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.1.1/lib/active_support/lazy_load_hooks.rb:35:in `block in on_load'
/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.1.1/lib/active_support/lazy_load_hooks.rb:34:in `each'
/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.1.1/lib/active_support/lazy_load_hooks.rb:34:in `on_load'
/app/vendor/bundle/ruby/2.6.0/gems/shopify-money-1.1.2/lib/money/railtie.rb:6:in `block in <class:Railtie>'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/initializable.rb:30:in `instance_exec'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/initializable.rb:30:in `run'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/initializable.rb:59:in `block in run_initializers'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/initializable.rb:58:in `run_initializers'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/application.rb:353:in `initialize!'
/app/config/environment.rb:5:in `<top (required)>'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/application.rb:329:in `require_environment!'
/app/vendor/bundle/ruby/2.6.0/gems/railties-5.1.1/lib/rails/application.rb:445:in `block in run_tasks_blocks'
/app/vendor/bundle/ruby/2.6.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `load'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `kernel_load'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:28:in `run'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:463:in `exec'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:27:in `dispatch'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:18:in `start'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/exe/bundle:30:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/exe/bundle:22:in `<top (required)>'
/app/bin/bundle:3:in `load'
/app/bin/bundle:3:in `<main>'
Tasks: TOP => db:reload => environment
(See full trace by running task with --trace)

I know you guys aren't a Heroku support forum, but I wonder if you might have some ideas? Thank you for your time!