diff --git a/lib/invisible_ink.rb b/lib/invisible_ink.rb
index 52ba13d..9ade89f 100644
--- a/lib/invisible_ink.rb
+++ b/lib/invisible_ink.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "invisible_ink/version"
+require "active_support"
 require "active_support/encrypted_file"
 require "securerandom"
 require "shellwords"