diff --git a/Gemfile b/Gemfile
index b60d3acf3..925b34f34 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,7 @@ gem 'rails',                          '~> 6.0'
 
 gem 'sass-rails'
 gem 'uglifier'
+gem 'terser'
 gem 'jquery-rails',                   '~> 4'
 gem 'jquery-ui-rails',                '~> 5'
 gem 'turbolinks',                     '~> 5'
diff --git a/Gemfile.lock b/Gemfile.lock
index 94fa6fdf0..2029a8815 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -459,6 +459,8 @@ GEM
       attr_extras (>= 6.2.4)
       diff-lcs
       patience_diff
+    terser (1.1.16)
+      execjs (>= 0.3.0, < 3)
     thor (1.2.2)
     tilt (2.2.0)
     timecop (0.9.6)
@@ -559,6 +561,7 @@ DEPENDENCIES
   spring (~> 2.1.0)
   spring-commands-rspec
   super_diff
+  terser
   timecop
   tinymce-rails
   turbolinks (~> 5)
diff --git a/config/environments/production.rb b/config/environments/production.rb
index ef2151742..f11b6142d 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -26,7 +26,7 @@
   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
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.