diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index e987a0e279..e515d062fe 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,7 +1,11 @@
-*   Set polymorphic type column to NULL on `dependent: :nullify` strategy. 
-    
+*   Remove deprecated `expand_hash_conditions_for_aggregates`.
+
+    *Rafael Mendonça França*
+
+*   Set polymorphic type column to NULL on `dependent: :nullify` strategy.
+
     On polymorphic associations both the foreign key and the foreign type columns will be set to NULL.
-    
+
     *Laerti Papa*
 
 *   Allow `ActionController::Params` as argument of `ActiveRecord::Base#exists?`.
diff --git a/activerecord/lib/active_record/sanitization.rb b/activerecord/lib/active_record/sanitization.rb
index 3485d9e557..e6197752bc 100644
--- a/activerecord/lib/active_record/sanitization.rb
+++ b/activerecord/lib/active_record/sanitization.rb
@@ -134,43 +134,6 @@ module ActiveRecord
       end
 
       private
-        # Accepts a hash of SQL conditions and replaces those attributes
-        # that correspond to a {#composed_of}[rdoc-ref:Aggregations::ClassMethods#composed_of]
-        # relationship with their expanded aggregate attribute values.
-        #
-        # Given:
-        #
-        #   class Person < ActiveRecord::Base
-        #     composed_of :address, class_name: "Address",
-        #       mapping: [%w(address_street street), %w(address_city city)]
-        #   end
-        #
-        # Then:
-        #
-        #   { address: Address.new("813 abc st.", "chicago") }
-        #   # => { address_street: "813 abc st.", address_city: "chicago" }
-        def expand_hash_conditions_for_aggregates(attrs) # :doc:
-          expanded_attrs = {}
-          attrs.each do |attr, value|
-            if aggregation = reflect_on_aggregation(attr.to_sym)
-              mapping = aggregation.mapping
-              mapping.each do |field_attr, aggregate_attr|
-                expanded_attrs[field_attr] = if value.is_a?(Array)
-                  value.map { |it| it.send(aggregate_attr) }
-                elsif mapping.size == 1 && !value.respond_to?(aggregate_attr)
-                  value
-                else
-                  value.send(aggregate_attr)
-                end
-              end
-            else
-              expanded_attrs[attr] = value
-            end
-          end
-          expanded_attrs
-        end
-        deprecate :expand_hash_conditions_for_aggregates
-
         def replace_bind_variables(statement, values)
           raise_if_bind_arity_mismatch(statement, statement.count("?"), values.size)
           bound = values.dup
diff --git a/activerecord/test/cases/sanitize_test.rb b/activerecord/test/cases/sanitize_test.rb
index 778cf86ac3..18b27bd6d1 100644
--- a/activerecord/test/cases/sanitize_test.rb
+++ b/activerecord/test/cases/sanitize_test.rb
@@ -168,12 +168,6 @@ class SanitizeTest < ActiveRecord::TestCase
     assert_equal "#{ActiveRecord::Base.connection.quote('10')}::integer '2009-01-01'::date", l.call
   end
 
-  def test_deprecated_expand_hash_conditions_for_aggregates
-    assert_deprecated do
-      assert_equal({ "balance" => 50 }, Customer.send(:expand_hash_conditions_for_aggregates, balance: Money.new(50)))
-    end
-  end
-
   private
     def bind(statement, *vars)
       if vars.first.is_a?(Hash)