diff --git a/Gemfile b/Gemfile
index 01c2cfd7..4d71513f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,7 @@ gem 'mail', '~> 2.7.1' # bug with mail 2.8.0 https://github.com/mikel/mail/issue
 
 gem 'sassc-rails'
 gem 'less-rails'
+gem 'uglifier'
 # See https://github.com/sstephenson/execjs#readme for more supported runtimes
 gem 'therubyracer', platforms: :ruby
 
@@ -127,5 +128,3 @@ group :test do
 end
 
 gem "importmap-rails", "~> 1.1"
-
-gem "terser", "~> 1.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index 5b1a9fe7..88fa2944 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -547,8 +547,6 @@ GEM
       sqlite3 (>= 1.3.3)
     table_print (1.5.7)
     temple (0.9.1)
-    terser (1.1.13)
-      execjs (>= 0.3.0, < 3)
     therubyracer (0.12.3)
       libv8 (~> 3.16.14.15)
       ref
@@ -569,6 +567,8 @@ GEM
       unf (~> 0.1.0)
     tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
+    uglifier (4.2.0)
+      execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
@@ -683,9 +683,9 @@ DEPENDENCIES
   sprockets (< 4)
   sqlite3 (~> 1.3.6)
   table_print
-  terser (~> 1.1)
   therubyracer
   twitter-bootstrap-rails (~> 2.2.8)
+  uglifier
   web-console
   whenever
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index d08234e5..266c31af 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -29,7 +29,7 @@ Rails.application.configure do
   config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
 
   # Compress JavaScripts and CSS.
-  config.assets.js_compressor = :terser
+  config.assets.js_compressor = Uglifier.new(harmony: true)
   config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.