diff --git a/CHANGELOG.md b/CHANGELOG.md
index 975defb4..ca168f75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@
 * bug fixes
   * Do not modify `:except` option given to `#serializable_hash`. (by @dpep)
 
+* deprecations
+  * `Devise::Models::Authenticatable::BLACKLIST_FOR_SERIALIZATION` is deprecated in favor of `Devise::Models::Authenticatable::UNSAFE_ATTRIBUTES_FOR_SERIALIZATION` (@hanachin)
+
 ### 4.7.2 - 2020-06-10
 
 * enhancements
diff --git a/lib/devise/models/authenticatable.rb b/lib/devise/models/authenticatable.rb
index 9d456fa3..3df93112 100644
--- a/lib/devise/models/authenticatable.rb
+++ b/lib/devise/models/authenticatable.rb
@@ -2,6 +2,7 @@
 
 require 'devise/hooks/activatable'
 require 'devise/hooks/csrf_cleaner'
+require 'devise/rails/deprecated_constant_accessor'
 
 module Devise
   module Models
@@ -55,11 +56,14 @@ module Devise
     module Authenticatable
       extend ActiveSupport::Concern
 
-      BLACKLIST_FOR_SERIALIZATION = [:encrypted_password, :reset_password_token, :reset_password_sent_at,
+      UNSAFE_ATTRIBUTES_FOR_SERIALIZATION = [:encrypted_password, :reset_password_token, :reset_password_sent_at,
         :remember_created_at, :sign_in_count, :current_sign_in_at, :last_sign_in_at, :current_sign_in_ip,
         :last_sign_in_ip, :password_salt, :confirmation_token, :confirmed_at, :confirmation_sent_at,
         :remember_token, :unconfirmed_email, :failed_attempts, :unlock_token, :locked_at]
 
+      include Devise::DeprecatedConstantAccessor
+      deprecate_constant "BLACKLIST_FOR_SERIALIZATION", "Devise::Models::Authenticatable::UNSAFE_ATTRIBUTES_FOR_SERIALIZATION"
+
       included do
         class_attribute :devise_modules, instance_writer: false
         self.devise_modules ||= []
@@ -109,7 +113,7 @@ module Devise
         if options[:force_except]
           options[:except].concat Array(options[:force_except])
         else
-          options[:except].concat BLACKLIST_FOR_SERIALIZATION
+          options[:except].concat UNSAFE_ATTRIBUTES_FOR_SERIALIZATION
         end
 
         super(options)
diff --git a/lib/devise/rails/deprecated_constant_accessor.rb b/lib/devise/rails/deprecated_constant_accessor.rb
new file mode 100644
index 00000000..d1eff92f
--- /dev/null
+++ b/lib/devise/rails/deprecated_constant_accessor.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+begin
+  require 'active_support/deprecation/constant_accessor'
+
+  module Devise
+    DeprecatedConstantAccessor = ActiveSupport::Deprecation::DeprecatedConstantAccessor #:nodoc:
+  end
+rescue LoadError
+
+  # Copy of constant deprecation module from Rails / Active Support version 6, so we can use it
+  # with Rails <= 5.0 versions. This can be removed once we support only Rails 5.1 or greater.
+  module Devise
+    module DeprecatedConstantAccessor #:nodoc:
+      def self.included(base)
+        require "active_support/inflector/methods"
+
+        extension = Module.new do
+          def const_missing(missing_const_name)
+            if class_variable_defined?(:@@_deprecated_constants)
+              if (replacement = class_variable_get(:@@_deprecated_constants)[missing_const_name.to_s])
+                replacement[:deprecator].warn(replacement[:message] || "#{name}::#{missing_const_name} is deprecated! Use #{replacement[:new]} instead.", Rails::VERSION::MAJOR == 4 ? caller : caller_locations)
+                return ActiveSupport::Inflector.constantize(replacement[:new].to_s)
+              end
+            end
+            super
+          end
+
+          def deprecate_constant(const_name, new_constant, message: nil, deprecator: ActiveSupport::Deprecation.instance)
+            class_variable_set(:@@_deprecated_constants, {}) unless class_variable_defined?(:@@_deprecated_constants)
+            class_variable_get(:@@_deprecated_constants)[const_name.to_s] = { new: new_constant, message: message, deprecator: deprecator }
+          end
+        end
+        base.singleton_class.prepend extension
+      end
+    end
+  end
+
+end
diff --git a/test/models/serializable_test.rb b/test/models/serializable_test.rb
index 245da05a..52a19813 100644
--- a/test/models/serializable_test.rb
+++ b/test/models/serializable_test.rb
@@ -46,6 +46,10 @@ class SerializableTest < ActiveSupport::TestCase
     assert_key "username", @user.as_json({ only: :username, except: [:email].freeze }.freeze)["user"]
   end
 
+  test 'constant `BLACKLIST_FOR_SERIALIZATION` is deprecated' do
+    assert_deprecated { Devise::Models::Authenticatable::BLACKLIST_FOR_SERIALIZATION }
+  end
+
   def assert_key(key, subject)
     assert subject.key?(key), "Expected #{subject.inspect} to have key #{key.inspect}"
   end