diff --git a/.travis.yml b/.travis.yml
index 74c23ef..8c598d7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: ruby
 before_install:
   - gem update bundler
-  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.1.1.deb && sudo dpkg -i --force-confnew elasticsearch-5.1.1.deb && sudo service elasticsearch restart
+  - curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.6.1.deb && sudo dpkg -i --force-confnew elasticsearch-6.6.1.deb && sudo service elasticsearch restart
 rvm:
   - 2.2.2
   - 2.2.3
diff --git a/CHANGELOG b/CHANGELOG
index be50c88..2ab0d6f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+v0.13.0
+  - update test to run against 6.6.1
 v0.12.0
   - warn when configuring a index with subclasses if using ES version that does support them
   - raise exception when creating or adding document to an index configured with subclasses if using
diff --git a/README.md b/README.md
index ccb45ff..013d0e1 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Or install it yourself as:
 ### Version Support
 This gem has [elasticsearch-ruby](https://github.com/elastic/elasticsearch-ruby) as a dependency.  In order to use different versions of elasticsearch you will need to match your version of elasticsearch-ruby to the version of elasticsearch you want to use ([see here](https://github.com/elastic/elasticsearch-ruby#compatibility).  Elasticity should work across all versions of elastisearch-ruby, although they have not all been tested so there are likely edge cases.
 
-Currently tests are run on travis ci against elasticsearch 5.1.1 with elasticsearch-ruby 5.0.3.
+Currently tests are run on travis ci against elasticsearch 6.6.1 with elasticsearch-ruby 5.0.3.
 
 ### Configuration
 
diff --git a/es-elasticity-0.12.0.pre.rc1.gem b/es-elasticity-0.12.0.pre.rc1.gem
deleted file mode 100644
index ceb2c18..0000000
Binary files a/es-elasticity-0.12.0.pre.rc1.gem and /dev/null differ
diff --git a/lib/elasticity/version.rb b/lib/elasticity/version.rb
index 4bb86e3..45117ad 100644
--- a/lib/elasticity/version.rb
+++ b/lib/elasticity/version.rb
@@ -1,3 +1,3 @@
 module Elasticity
-  VERSION = "0.12.0"
+  VERSION = "0.13.0"
 end
diff --git a/spec/functional/persistence_spec.rb b/spec/functional/persistence_spec.rb
index 6721ddf..6490859 100644
--- a/spec/functional/persistence_spec.rb
+++ b/spec/functional/persistence_spec.rb
@@ -71,88 +71,6 @@ def to_document
     end
   end
 
-  describe 'multi mapping index' do
-    class Animal < Elasticity::Document
-      configure do |c|
-        c.index_base_name = "cats_and_dogs"
-        c.strategy = Elasticity::Strategies::SingleIndex
-        c.subclasses = { cat: "Cat", dog: "Dog" }
-      end
-    end
-
-    class Cat < Animal
-      configure do |c|
-        c.index_base_name = "cats_and_dogs"
-        c.strategy = Elasticity::Strategies::SingleIndex
-        c.document_type  = "cat"
-
-        c.mapping = { "properties" => {
-          name: { type: "text", index: true },
-          age: { type: "integer" }
-        } }
-      end
-
-      attr_accessor :name, :age
-
-      def to_document
-        { name: name, age: age }
-      end
-    end
-
-    class Dog < Animal
-      configure do |c|
-        c.index_base_name = "cats_and_dogs"
-        c.strategy = Elasticity::Strategies::SingleIndex
-        c.document_type = "dog"
-        c.mapping = { "properties" => {
-          name: { type: "text", index: true },
-          age: { type: "integer" },
-          hungry: { type: "boolean" }
-        } }
-      end
-      attr_accessor :name, :age, :hungry
-
-      def to_document
-        { name: name, age: age, hungry: hungry }
-      end
-    end
-
-    before do
-      Animal.recreate_index
-      @elastic_search_client.cluster.health wait_for_status: 'yellow'
-    end
-
-    it "successful index, update, search, count and deletes" do
-      cat = Cat.new(name: "felix", age: 10)
-      dog = Dog.new(name: "fido", age: 4, hungry: true)
-
-      cat.update
-      dog.update
-
-      Animal.flush_index
-
-      results = Animal.search({})
-      expect(results.total).to eq 2
-      expect(results.map(&:class)).to include(Cat, Dog)
-
-      results = Cat.search({})
-      expect(results.total).to eq 1
-      expect(results.first.class).to eq Cat
-
-      results = Dog.search({})
-      expect(results.total).to eq 1
-      expect(results.first.class).to eq Dog
-
-      cat.delete
-      Animal.flush_index
-
-      results = Animal.search({})
-      expect(results.total).to eq 1
-      expect(results.map(&:class)).to include(Dog)
-      expect(results.scan_documents.count).to eq(1)
-    end
-  end
-
   describe "alias index strategy" do
     subject do
       Class.new(Elasticity::Document) do
diff --git a/spec/units/strategies/single_index_spec.rb b/spec/units/strategies/single_index_spec.rb
index 860602c..3c0d822 100644
--- a/spec/units/strategies/single_index_spec.rb
+++ b/spec/units/strategies/single_index_spec.rb
@@ -66,7 +66,7 @@
       subject.flush
 
       expect { subject.get_document("document", 1) }.to raise_error(Elasticsearch::Transport::Transport::Errors::NotFound)
-      expect(subject.get_document("document", 2)).to eq({"_index"=>"test_index_name", "_type"=>"document", "_id"=>"2", "_version"=>1, "found"=>true, "_source"=>{"name"=>"bar"}})
+      expect(subject.get_document("document", 2)).to include({"_index"=>"test_index_name", "_type"=>"document", "_id"=>"2", "_version"=>1, "found"=>true, "_source"=>{"name"=>"bar"}})
     end
 
     it "allows deleting by query" do