diff --git a/Gemfile b/Gemfile
index e5ebad5a0..a8c50228a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,8 +15,8 @@ gem 'open_uri_redirections'
 # for stylesheets
 gem 'sassc-rails'
 
-# as compressor for JavaScript assets
-gem 'uglifier'
+# as javascript asset compressor
+gem 'terser'
 
 # for translations
 gem 'fast_gettext', '>= 0.7.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5c7790692..4d93a3dbe 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -90,7 +90,7 @@ GEM
     dalli (3.2.1)
     digest (3.1.0)
     erubi (1.10.0)
-    execjs (2.7.0)
+    execjs (2.8.1)
     faker (2.20.0)
       i18n (>= 1.8.11, < 2)
     faraday (1.10.0)
@@ -278,14 +278,14 @@ GEM
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
     strscan (3.0.1)
+    terser (1.1.8)
+      execjs (>= 0.3.0, < 3)
     text (1.3.1)
     thor (1.2.1)
     tilt (2.0.10)
     timeout (0.2.0)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
-    uglifier (4.2.0)
-      execjs (>= 0.3.0, < 3)
     unicode-display_width (2.1.0)
     vcr (6.1.0)
     webmock (3.14.0)
@@ -338,7 +338,7 @@ DEPENDENCIES
   sassc-rails
   selenium-webdriver
   sprockets-rails
-  uglifier
+  terser
   vcr
   webmock
   xmlhash (>= 1.2.2)
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 5a2c5a9df..84bde36da 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -24,8 +24,9 @@
   # Apache or NGINX already handles this.
   config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
-  # Compress CSS using a preprocessor.
-  config.assets.css_compressor = :uglifier
+  # Compress assets using a preprocessor
+  config.assets.css_compressor = :sass
+  config.assets.js_compressor = :terser
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.
   config.assets.compile = false
diff --git a/vendor/cache/execjs-2.7.0.gem b/vendor/cache/execjs-2.7.0.gem
deleted file mode 100644
index 1247cce45..000000000
Binary files a/vendor/cache/execjs-2.7.0.gem and /dev/null differ
diff --git a/vendor/cache/execjs-2.8.1.gem b/vendor/cache/execjs-2.8.1.gem
new file mode 100644
index 000000000..b8c2d2fc4
Binary files /dev/null and b/vendor/cache/execjs-2.8.1.gem differ
diff --git a/vendor/cache/terser-1.1.8.gem b/vendor/cache/terser-1.1.8.gem
new file mode 100644
index 000000000..726ebfbc6
Binary files /dev/null and b/vendor/cache/terser-1.1.8.gem differ
diff --git a/vendor/cache/uglifier-4.2.0.gem b/vendor/cache/uglifier-4.2.0.gem
deleted file mode 100644
index 9b97e3c83..000000000
Binary files a/vendor/cache/uglifier-4.2.0.gem and /dev/null differ