diff --git a/rswag-specs/lib/rswag/specs/example_group_helpers.rb b/rswag-specs/lib/rswag/specs/example_group_helpers.rb
index 0cf89d9..591a7e9 100644
--- a/rswag-specs/lib/rswag/specs/example_group_helpers.rb
+++ b/rswag-specs/lib/rswag/specs/example_group_helpers.rb
@@ -75,46 +75,6 @@ module Rswag
         metadata[:response][:examples] = example
       end
 
-      ## OA3
-      # # checks the examples in the parameters should be able to add $ref and externalValue examples.
-      # # This syntax would look something like this in the integration _spec.rb file
-      # #
-      # # request_body_json schema: { '$ref' => '#/components/schemas/blog' },
-      # #   examples: [:blog, {name: :external_blog,
-      # #                       externalValue: 'http://api.sample.org/myjson_example'},
-      # #                     {name: :another_example,
-      # #                       '$ref' => '#/components/examples/flexible_blog_example'}]
-      # # The first value :blog, points to a let param of the same name, and is used to make the request in the
-      # # integration test (it is used to build the request payload)
-      # #
-      # # The second item in the array shows how to add an externalValue for the examples in the requestBody section
-      # # The third item shows how to add a $ref item that points to the components/examples section of the swagger spec.
-      # #
-      # # NOTE: that the externalValue will produce valid example syntax in the swagger output, but swagger-ui
-      # # will not show it yet
-      # def merge_other_examples!(example_metadata)
-      #   # example.metadata[:operation][:requestBody][:content]['application/json'][:examples]
-      #   content_node = example_metadata[:operation][:requestBody][:content]['application/json']
-      #   return unless content_node
-
-      #   external_example = example_metadata[:operation]&.dig(:parameters)&.detect { |p| p[:in] == :body && p[:name].is_a?(Hash) && p[:name][:externalValue] } || {}
-      #   ref_example = example_metadata[:operation]&.dig(:parameters)&.detect { |p| p[:in] == :body && p[:name].is_a?(Hash) && p[:name]['$ref'] } || {}
-      #   examples_node = content_node[:examples] ||= {}
-
-      #   nodes_to_add = []
-      #   nodes_to_add << external_example unless external_example.empty?
-      #   nodes_to_add << ref_example unless ref_example.empty?
-
-      #   nodes_to_add.each do |node|
-      #     json_request_examples = examples_node ||= {}
-      #     other_name = node[:name][:name]
-      #     other_key = node[:name][:externalValue] ? :externalValue : '$ref'
-      #     if other_name
-      #       json_request_examples.merge!(other_name => {other_key => node[:param_value]})
-      #     end
-      #   end
-      # end
-
       def run_test!(&block)
         # NOTE: rspec 2.x support
         if RSPEC_VERSION < 3
@@ -135,30 +95,6 @@ module Rswag
             assert_response_matches_metadata(example.metadata, &block)
             example.instance_exec(response, &block) if block_given?
           end
-
-          ## OA3
-          # after do |example|
-          #   body_parameter = example.metadata[:operation]&.dig(:parameters)&.detect { |p| p[:in] == :body && p[:required] }
-
-          #   if body_parameter && respond_to?(body_parameter[:name]) && example.metadata[:operation][:requestBody][:content]['application/json']
-          #     # save response examples by default
-          #     if example.metadata[:response][:examples].nil? || example.metadata[:response][:examples].empty?
-          #       example.metadata[:response][:examples] = { 'application/json' => JSON.parse(response.body, symbolize_names: true) } unless response.body.to_s.empty?
-          #     end
-
-          #     # save request examples using the let(:param_name) { REQUEST_BODY_HASH } syntax in the test
-          #     if response.code.to_s =~ /^2\d{2}$/
-          #       example.metadata[:operation][:requestBody][:content]['application/json'] = { examples: {} } unless example.metadata[:operation][:requestBody][:content]['application/json'][:examples]
-          #       json_request_examples = example.metadata[:operation][:requestBody][:content]['application/json'][:examples]
-          #       json_request_examples[body_parameter[:name]] = { value: send(body_parameter[:name]) }
-
-          #       example.metadata[:operation][:requestBody][:content]['application/json'][:examples] = json_request_examples
-          #     end
-          #   end
-
-          #   self.class.merge_other_examples!(example.metadata) if example.metadata[:operation][:requestBody]
-
-          # end
         end
       end
     end
diff --git a/rswag-specs/lib/rswag/specs/extended_schema.rb b/rswag-specs/lib/rswag/specs/extended_schema.rb
index 9923bda..3af8efc 100644
--- a/rswag-specs/lib/rswag/specs/extended_schema.rb
+++ b/rswag-specs/lib/rswag/specs/extended_schema.rb
@@ -15,9 +15,7 @@ module Rswag
 
     class ExtendedTypeAttribute < JSON::Schema::TypeV4Attribute
       def self.validate(current_schema, data, fragments, processor, validator, options = {})
-        ## OA3
-        # return if data.nil? && (current_schema.schema['nullable'] == true || current_schema.schema['x-nullable'] == true)
-        return if data.nil? && current_schema.schema['x-nullable'] == true
+        return if data.nil? && (current_schema.schema['nullable'] == true || current_schema.schema['x-nullable'] == true)
 
         super
       end
diff --git a/rswag-specs/lib/rswag/specs/request_factory.rb b/rswag-specs/lib/rswag/specs/request_factory.rb
index 5af3649..e5dff39 100644
--- a/rswag-specs/lib/rswag/specs/request_factory.rb
+++ b/rswag-specs/lib/rswag/specs/request_factory.rb
@@ -196,15 +196,6 @@ module Rswag
         body_param = parameters.select { |p| p[:in] == :body }.first
         body_param ? example.send(body_param[:name]).to_json : nil
       end
-      ## OA3
-      # def build_json_payload(parameters, example)
-      #   body_param = parameters.select { |p| p[:in] == :body &&  p[:name].is_a?(Symbol) }.first
-      #   return nil unless body_param
-
-      #   source_body_param = example.send(body_param[:name]) if body_param[:name] && example.respond_to?(body_param[:name])
-      #   source_body_param ||= body_param[:param_value]
-      #   source_body_param ? source_body_param.to_json : nil
-      # end
 
       def doc_version(doc)
         doc[:openapi] || doc[:swagger] || '3'
diff --git a/rswag-specs/lib/rswag/specs/swagger_formatter.rb b/rswag-specs/lib/rswag/specs/swagger_formatter.rb
index 7cda583..0b15f12 100644
--- a/rswag-specs/lib/rswag/specs/swagger_formatter.rb
+++ b/rswag-specs/lib/rswag/specs/swagger_formatter.rb
@@ -102,17 +102,6 @@ module Rswag
       def metadata_to_swagger(metadata)
         response_code = metadata[:response][:code]
         response = metadata[:response].reject { |k, _v| k == :code }
-        ## OA3
-        # content_type = metadata[:response][:content].present? ? metadata[:response][:content].keys.first : 'application/json'
-        # # need to merge in to response
-        # if response[:examples]&.dig(content_type)
-        #   example = response[:examples].dig(content_type).dup
-        #   schema = response.dig(:content, content_type, :schema)
-        #   new_hash = {example: example}
-        #   new_hash[:schema] = schema if schema
-        #   response.merge!(content: { content_type => new_hash })
-        #   response.delete(:examples)
-        # end
 
         verb = metadata[:operation][:verb]
         operation = metadata[:operation]
diff --git a/rswag-specs/spec/rswag/specs/example_group_helpers_spec.rb b/rswag-specs/spec/rswag/specs/example_group_helpers_spec.rb
index b3d6d33..2922523 100644
--- a/rswag-specs/spec/rswag/specs/example_group_helpers_spec.rb
+++ b/rswag-specs/spec/rswag/specs/example_group_helpers_spec.rb
@@ -62,40 +62,6 @@ module Rswag
         end
       end
 
-      ## OA3
-      # describe '#request_body_json(schema)' do
-      #   let(:api_metadata) { { path_item: {}, operation: {} } } # i.e. operation defined
-      #   context 'when required is not supplied' do
-      #     before { subject.request_body_json(schema: { type: 'object' }) }
-
-      #     it 'adds required true by default' do
-      #       expect(api_metadata[:operation][:requestBody]).to match(
-      #                                                             required: true, content: { 'application/json' => { schema: { type: 'object' } } }
-      #                                                         )
-      #     end
-      #   end
-
-      #   context 'when required is supplied' do
-      #     before { subject.request_body_json(schema: { type: 'object' }, required: false) }
-
-      #     it 'adds required false' do
-      #       expect(api_metadata[:operation][:requestBody]).to match(
-      #                                                             required: false, content: { 'application/json' => { schema: { type: 'object' } } }
-      #                                                         )
-      #     end
-      #   end
-
-      #   context 'when required is supplied' do
-      #     before { subject.request_body_json(schema: { type: 'object' }, description: 'my description') }
-
-      #     it 'adds description' do
-      #       expect(api_metadata[:operation][:requestBody]).to match(
-      #                                                             description: 'my description', required: true, content: { 'application/json' => { schema: { type: 'object' } } }
-      #                                                         )
-      #     end
-      #   end
-      # end
-
       describe '#parameter(attributes)' do
         context "when called at the 'path' level" do
           before { subject.parameter(name: :blog, in: :body, schema: { type: 'object' }) }
diff --git a/rswag-specs/spec/rswag/specs/example_helpers_spec.rb b/rswag-specs/spec/rswag/specs/example_helpers_spec.rb
index 52394b4..0f3e1ba 100644
--- a/rswag-specs/spec/rswag/specs/example_helpers_spec.rb
+++ b/rswag-specs/spec/rswag/specs/example_helpers_spec.rb
@@ -63,8 +63,6 @@ module Rswag
             '/blogs/1/comments/2?q1=foo&api_key=fookey',
             '{"text":"Some comment"}',
             { 'CONTENT_TYPE' => 'application/json' }
-            ## OA3
-            # 'CONTENT_TYPE' => 'application/json'
           )
         end
       end
diff --git a/rswag-specs/spec/rswag/specs/request_factory_spec.rb b/rswag-specs/spec/rswag/specs/request_factory_spec.rb
index 2f2e5ff..aff5fb4 100644
--- a/rswag-specs/spec/rswag/specs/request_factory_spec.rb
+++ b/rswag-specs/spec/rswag/specs/request_factory_spec.rb
@@ -249,10 +249,6 @@ module Rswag
         context 'apiKey' do
           before do
             swagger_doc[:securityDefinitions] = { apiKey: { type: :apiKey, name: 'api_key', in: key_location } }
-            ## OA3
-            # swagger_doc[:components] = { securitySchemes: {
-            #   apiKey: { type: :apiKey, name: 'api_key', in: key_location }
-            # } }
             metadata[:operation][:security] = [apiKey: []]
             allow(example).to receive(:api_key).and_return('foobar')
           end
@@ -294,10 +290,6 @@ module Rswag
         context 'oauth2' do
           before do
             swagger_doc[:securityDefinitions] = { oauth2: { type: :oauth2, scopes: ['read:blogs'] } }
-            ## OA3
-            # swagger_doc[:components] = { securitySchemes: {
-            #     oauth2: { type: :oauth2, scopes: ['read:blogs'] }
-            # } }
             metadata[:operation][:security] = [oauth2: ['read:blogs']]
             allow(example).to receive(:Authorization).and_return('Bearer foobar')
           end
@@ -313,11 +305,6 @@ module Rswag
               basic: { type: :basic },
               api_key: { type: :apiKey, name: 'api_key', in: :query }
             }
-            ## OA3
-            # swagger_doc[:components] = { securitySchemes: {
-            #     basic: { type: :basic },
-            #     api_key: { type: :apiKey, name: 'api_key', in: :query }
-            # } }
             metadata[:operation][:security] = [{ basic: [], api_key: [] }]
             allow(example).to receive(:Authorization).and_return('Basic foobar')
             allow(example).to receive(:api_key).and_return('foobar')
@@ -406,8 +393,6 @@ module Rswag
         context 'global security requirements' do
           before do
             swagger_doc[:securityDefinitions] = { apiKey: { type: :apiKey, name: 'api_key', in: :query } }
-            ## OA3
-            # swagger_doc[:components] = { securitySchemes: { apiKey: { type: :apiKey, name: 'api_key', in: :query } } }
             swagger_doc[:security] = [apiKey: []]
             allow(example).to receive(:api_key).and_return('foobar')
           end
diff --git a/rswag-specs/spec/rswag/specs/response_validator_spec.rb b/rswag-specs/spec/rswag/specs/response_validator_spec.rb
index a4c2bc6..e4c8e9c 100644
--- a/rswag-specs/spec/rswag/specs/response_validator_spec.rb
+++ b/rswag-specs/spec/rswag/specs/response_validator_spec.rb
@@ -24,16 +24,6 @@ module Rswag
               properties: { text: { type: :string } },
               required: ['text']
             }
-            ## OA3
-            # content: {
-            #   'application/json' => {
-            #     schema: {
-            #       type: :object,
-            #       properties: { text: { type: :string } },
-            #       required: ['text']
-            #     }
-            #   }
-            # }
           }
         }
       end
diff --git a/test-app/db/schema.rb b/test-app/db/schema.rb
index e01f8f3..440d919 100644
--- a/test-app/db/schema.rb
+++ b/test-app/db/schema.rb
@@ -2,11 +2,11 @@
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
 #
-# This file is the source Rails uses to define your schema when running `rails
-# db:schema:load`. When creating a new database, `rails db:schema:load` tends to
-# be faster and is potentially less error prone than running all of your
-# migrations from scratch. Old migrations may fail to apply correctly if those
-# migrations use external dependencies or application code.
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
 #
 # It's strongly recommended that you check this file into your version control system.
 
diff --git a/test-app/spec/integration/new_blogs_spec.rb b/test-app/spec/integration/new_blogs_spec.rb
deleted file mode 100644
index 9706648..0000000
--- a/test-app/spec/integration/new_blogs_spec.rb
+++ /dev/null
@@ -1,170 +0,0 @@
-# # frozen_string_literal: true
-
-# require 'swagger_helper'
-
-# RSpec.describe 'Blogs API', type: :request, swagger_doc: 'v1/swagger.json' do
-#   let(:api_key) { 'fake_key' }
-
-#   path '/blogs' do
-#     post 'Creates a blog' do
-#       tags 'Blogs'
-#       description 'Creates a new blog from provided data'
-#       operationId 'createBlog'
-#       consumes 'application/json'
-#       produces 'application/json'
-
-#       request_body_json schema: { '$ref' => '#/components/schemas/blog' },
-#                         examples: :blog
-
-#       request_body_text_plain
-#       request_body_xml schema: { '$ref' => '#/components/schemas/blog' }
-
-#       let(:blog) { { blog: { title: 'foo', content: 'bar' } } }
-
-#       response '201', 'blog created' do
-#         schema '$ref' => '#/components/schemas/blog'
-#         run_test!
-#       end
-
-#       response '422', 'invalid request' do
-#         schema '$ref' => '#/components/schemas/errors_object'
-#         let(:blog) { { blog: { title: 'foo' } } }
-
-#         run_test! do |response|
-#           expect(response.body).to include("can't be blank")
-#         end
-#       end
-#     end
-
-#     get 'Searches blogs' do
-#       tags 'Blogs'
-#       description 'Searches blogs by keywords'
-#       operationId 'searchBlogs'
-#       produces 'application/json'
-#       parameter name: :keywords, in: :query, type: 'string'
-
-#       let(:keywords) { 'foo bar' }
-
-#       response '200', 'success' do
-#         schema type: 'array', items: { '$ref' => '#/components/schemas/blog' }
-#         run_test!
-#       end
-
-#       response '406', 'unsupported accept header' do
-#         let(:Accept) { 'application/foo' }
-#         run_test!
-#       end
-#     end
-#   end
-
-#   path '/blogs/flexible' do
-#     post 'Creates a blog flexible body' do
-#       tags 'Blogs'
-#       description 'Creates a flexible blog from provided data'
-#       operationId 'createFlexibleBlog'
-#       consumes 'application/json'
-#       produces 'application/json'
-
-#       request_body_json schema: {
-#                                   :oneOf => [{'$ref' => '#/components/schemas/blog'},
-#                                              {'$ref' => '#/components/schemas/flexible_blog'}]
-#                                 },
-#                         examples: :flexible_blog
-
-#       let(:flexible_blog) { { blog: { headline: 'my headline', text: 'my text' } } }
-
-#       response '201', 'flexible blog created' do
-#         schema :oneOf => [{'$ref' => '#/components/schemas/blog'},{'$ref' => '#/components/schemas/flexible_blog'}]
-#         run_test!
-#       end
-#     end
-#   end
-
-#   path '/blogs/alternate' do
-#     post 'Creates a blog - different :examples in requestBody' do
-#       tags 'Blogs'
-#       description 'Creates a new blog from provided data'
-#       operationId 'createAlternateBlog'
-#       consumes 'application/json'
-#       produces 'application/json'
-
-#       # NOTE: the externalValue: http://... is valid 3.0 spec, but swagger-UI does NOT support it yet
-#       # https://github.com/swagger-api/swagger-ui/issues/5433
-#       request_body_json schema: { '$ref' => '#/components/schemas/blog' },
-#                         examples: [:blog, {name: :external_blog,
-#                                            externalValue: 'http://api.sample.org/myjson_example'},
-#                                           {name: :another_example,
-#                                            '$ref' => '#/components/examples/flexible_blog_example'}]
-
-#       let(:blog) { { blog: { title: 'alt title', content: 'alt bar' } } }
-
-#       response '201', 'blog created' do
-#         schema '$ref' => '#/components/schemas/blog'
-#         run_test!
-#       end
-#     end
-#   end
-
-
-
-#   path '/blogs/{id}' do
-
-
-#     let(:id) { blog.id }
-#     let(:blog) { Blog.create(title: 'foo', content: 'bar', thumbnail: 'thumbnail.png') }
-
-#     get 'Retrieves a blog' do
-#       tags 'Blogs'
-#       description 'Retrieves a specific blog by id'
-#       operationId 'getBlog'
-#       produces 'application/json'
-
-#       parameter name: :id, in: :path, type: :string
-
-#       response '200', 'blog found' do
-#         header 'ETag', type: :string
-#         header 'Last-Modified', type: :string
-#         header 'Cache-Control', type: :string
-
-#         schema '$ref' => '#/components/schemas/blog'
-
-#         examples 'application/json' => {
-#           id: 1,
-#           title: 'Hello world!',
-#           content: 'Hello world and hello universe. Thank you all very much!!!',
-#           thumbnail: 'thumbnail.png'
-#         }
-
-#         let(:id) { blog.id }
-#         run_test!
-#       end
-
-#       response '404', 'blog not found' do
-#         let(:id) { 'invalid' }
-#         run_test!
-#       end
-#     end
-#   end
-
-
-#   path '/blogs/{id}/upload' do
-#     let(:id) { blog.id }
-#     let(:blog) { Blog.create(title: 'foo', content: 'bar') }
-
-#     put 'Uploads a blog thumbnail' do
-#       parameter name: :id, in: :path, type: :string
-
-#       tags 'Blogs'
-#       description 'Upload a thumbnail for specific blog by id'
-#       operationId 'uploadThumbnailBlog'
-#       consumes 'multipart/form-data'
-
-#       request_body_multipart schema: {properties: {:orderId => { type: :integer }, file: { type: :string, format: :binary }} }
-
-#       response '200', 'blog updated' do
-#         let(:file) { Rack::Test::UploadedFile.new(Rails.root.join('spec/fixtures/thumbnail.png')) }
-#         run_test!
-#       end
-#     end
-#   end
-# end
diff --git a/test-app/swagger/v1/swagger.json b/test-app/swagger/v1/swagger.json
index df8d4ba..aa193be 100644
--- a/test-app/swagger/v1/swagger.json
+++ b/test-app/swagger/v1/swagger.json
@@ -100,20 +100,8 @@
         ],
         "description": "Creates a new blog from provided data",
         "operationId": "createBlog",
-        "consumes": [
-          "application/json"
-        ],
-        "produces": [
-          "application/json"
-        ],
         "parameters": [
-          {
-            "name": "blog",
-            "in": "body",
-            "schema": {
-              "$ref": "#/definitions/blog"
-            }
-          }
+
         ],
         "responses": {
           "201": {
@@ -131,6 +119,15 @@
               }
             }
           }
+        },
+        "requestBody": {
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/definitions/blog"
+              }
+            }
+          }
         }
       },
       "get": {
@@ -140,9 +137,6 @@
         ],
         "description": "Searches blogs by keywords",
         "operationId": "searchBlogs",
-        "produces": [
-          "application/json"
-        ],
         "parameters": [
           {
             "name": "keywords",
@@ -179,9 +173,6 @@
         ],
         "description": "Retrieves a specific blog by id",
         "operationId": "getBlog",
-        "produces": [
-          "application/json"
-        ],
         "responses": {
           "200": {
             "description": "blog found",
@@ -238,18 +229,8 @@
         ],
         "description": "Upload a thumbnail for specific blog by id",
         "operationId": "uploadThumbnailBlog",
-        "consumes": [
-          "multipart/form-data"
-        ],
         "parameters": [
-          {
-            "name": "file",
-            "in": "formData",
-            "required": true,
-            "schema": {
-              "type": "file"
-            }
-          }
+
         ],
         "responses": {
           "200": {
@@ -257,6 +238,15 @@
             "content": {
             }
           }
+        },
+        "requestBody": {
+          "content": {
+            "multipart/form-data": {
+              "schema": {
+                "type": "file"
+              }
+            }
+          }
         }
       }
     }