diff --git a/Gemfile b/Gemfile
index b2385655..407ae6ac 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,11 +4,14 @@ ruby "~> 3.2"
 # Server core
 gem 'rails', '~> 6.1'
 gem 'puma', '~> 5.6'
-gem 'puma-heroku'
 # gem 'bootsnap', require: false
 gem 'sprockets', '~> 4.2.0'
 gem 'terser'
 
+group :production do
+  gem 'puma-heroku'
+end
+
 # Storage
 gem 'aws-sdk', '~> 3.1'
 gem 'aws-sdk-s3'
diff --git a/config/environments/production.rb b/config/environments/production.rb
index d935372b..1d50c10f 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -23,7 +23,6 @@ Rails.application.configure do
   config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
 
   # Compress JavaScripts and CSS.
-  # config.assets.js_compressor = Uglifier.new(harmony: true)
   config.assets.js_compressor = :terser # (alternative for ES6)
   # config.assets.css_compressor = :sass