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-rw-r--r--actionpack/lib/action_dispatch/http/content_security_policy.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/content_security_policy.rb b/actionpack/lib/action_dispatch/http/content_security_policy.rb
index c888a27720..4883e23d24 100644
--- a/actionpack/lib/action_dispatch/http/content_security_policy.rb
+++ b/actionpack/lib/action_dispatch/http/content_security_policy.rb
@@ -1,5 +1,7 @@
# frozen_string_literal: true
+require "active_support/core_ext/object/deep_dup"
+
module ActionDispatch #:nodoc:
class ContentSecurityPolicy
class Middleware