diff --git a/activesupport/lib/active_support/security_utils.rb b/activesupport/lib/active_support/security_utils.rb
index 2693f3440c..acd598cf50 100644
--- a/activesupport/lib/active_support/security_utils.rb
+++ b/activesupport/lib/active_support/security_utils.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "digest/sha2"
-
 module ActiveSupport
   module SecurityUtils
     # Constant time string comparison, for fixed length strings.