diff --git a/activerecord/Rakefile b/activerecord/Rakefile
index 8b502a9b1a..1df3faf31d 100644
--- a/activerecord/Rakefile
+++ b/activerecord/Rakefile
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "shellwords"
 require "rake/testtask"
 
 require_relative "test/config"
diff --git a/activestorage/lib/active_storage/previewer/video_previewer.rb b/activestorage/lib/active_storage/previewer/video_previewer.rb
index bdb2fecde8..ad9054412c 100644
--- a/activestorage/lib/active_storage/previewer/video_previewer.rb
+++ b/activestorage/lib/active_storage/previewer/video_previewer.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "shellwords"
+
 module ActiveStorage
   class Previewer::VideoPreviewer < Previewer
     class << self
diff --git a/railties/Rakefile b/railties/Rakefile
index d013f7fc17..19a0e7b9e3 100644
--- a/railties/Rakefile
+++ b/railties/Rakefile
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "shellwords"
 require "rake/testtask"
 
 task default: :test
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index fe05e10878..61c287976a 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -9,6 +9,7 @@
 # It is also good to know what is the bare minimum to get
 # Rails booted up.
 require "fileutils"
+require "shellwords"
 
 require "bundler/setup" unless defined?(Bundler)
 require "active_support"