diff --git a/activerecord/lib/active_record/aggregations.rb b/activerecord/lib/active_record/aggregations.rb
index 51ffc7542c2e52c41722c22f7fb7211c69c7c42f..c45400d3d941eebe9fbeeb568be38f948561da1f 100644
--- a/activerecord/lib/active_record/aggregations.rb
+++ b/activerecord/lib/active_record/aggregations.rb
@@ -190,7 +190,7 @@ module ClassMethods
       #               :constructor => Proc.new { |ip| IPAddr.new(ip, Socket::AF_INET) },
       #               :converter => Proc.new { |ip| ip.is_a?(Integer) ? IPAddr.new(ip, Socket::AF_INET) : IPAddr.new(ip.to_s) }
       #
-      def composed_of(part_id, options = {}, &block)
+      def composed_of(part_id, options = {})
         options.assert_valid_keys(:class_name, :mapping, :allow_nil, :constructor, :converter)
 
         name        = part_id.id2name
@@ -199,9 +199,7 @@ def composed_of(part_id, options = {}, &block)
         mapping     = [ mapping ] unless mapping.first.is_a?(Array)
         allow_nil   = options[:allow_nil]   || false
         constructor = options[:constructor] || :new
-        converter   = options[:converter]   || block
-
-        ActiveSupport::Deprecation.warn('The conversion block has been deprecated, use the :converter option instead.', caller) if block_given?
+        converter   = options[:converter]
 
         reader_method(name, class_name, mapping, allow_nil, constructor)
         writer_method(name, class_name, mapping, allow_nil, converter)
diff --git a/activerecord/test/cases/aggregations_test.rb b/activerecord/test/cases/aggregations_test.rb
index e5fc1a204620cfc99d20c1b8680344972c6a5c66..74588b4f47ae03d92a41b4e1ccd318f4f5b4b0b6 100644
--- a/activerecord/test/cases/aggregations_test.rb
+++ b/activerecord/test/cases/aggregations_test.rb
@@ -121,34 +121,6 @@ def test_custom_converter
   end
 end
 
-class DeprecatedAggregationsTest < ActiveRecord::TestCase
-  class Person < ActiveRecord::Base; end
-
-  def test_conversion_block_is_deprecated
-    assert_deprecated 'conversion block has been deprecated' do
-      Person.composed_of(:balance, :class_name => "Money", :mapping => %w(balance amount)) { |balance| balance.to_money }
-    end
-  end
-
-  def test_conversion_block_used_when_converter_option_is_nil
-    assert_deprecated 'conversion block has been deprecated' do
-      Person.composed_of(:balance, :class_name => "Money", :mapping => %w(balance amount)) { |balance| balance.to_money }
-    end
-    assert_raise(NoMethodError) { Person.new.balance = 5 }
-  end
-
-  def test_converter_option_overrides_conversion_block
-    assert_deprecated 'conversion block has been deprecated' do
-      Person.composed_of(:balance, :class_name => "Money", :mapping => %w(balance amount), :converter => Proc.new { |balance| Money.new(balance) }) { |balance| balance.to_money }
-    end
-
-    person = Person.new
-    assert_nothing_raised { person.balance = 5 }
-    assert_equal 5, person.balance.amount
-    assert_kind_of Money, person.balance
-  end
-end
-
 class OverridingAggregationsTest < ActiveRecord::TestCase
   class Name; end
   class DifferentName; end