diff --git a/examples/request_body.py b/examples/request_body.py
new file mode 100644
index 00000000..12a04e8c
--- /dev/null
+++ b/examples/request_body.py
@@ -0,0 +1,78 @@
+"""
+In this example `openapi` version is used instead of `swagger` version.
+"""
+from flask import Flask, jsonify, request
+from flasgger import Swagger, swag_from
+
+app = Flask(__name__)
+swag = Swagger(app, config={
+    'headers': [],
+    'specs': [
+        {
+            'endpoint': 'apispec',
+            'route': '/apispec.json'
+        }
+    ],
+    'openapi': '3.0.1'
+})
+
+
+@swag.definition('Pet')
+class Pet(object):
+    """
+    Pet Object
+    ---
+    properties:
+        name:
+            type: string
+    """
+    def __init__(self, name):
+        self.name = str(name)
+
+    def dump(self):
+        return dict(vars(self).items())
+
+
+@app.route('/requestBody', methods=['POST'])
+@swag_from()
+def request_body_endpoint():
+    """
+    An endpoint for testing requestBody documentation.
+    ---
+    description: Post a request body
+    requestBody:
+        content:
+            application/json:
+                schema:
+                    $ref: '#/definitions/Pet'
+        required: true
+    responses:
+        200:
+            description: The posted request body
+            content:
+                application/json:
+                    schema:
+                        $ref: '#/definitions/Pet'
+    """
+    return jsonify(request.json)
+
+
+def test_swag(client, specs_data):
+    """
+    This test is runs automatically in Travis CI
+
+    :param client: Flask app test client
+    :param specs_data: {'url': {swag_specs}} for every spec in app
+    """
+    for url, spec in specs_data.items():
+        assert 'Pet' in spec['definitions']
+
+        assert 'paths' in spec
+        paths = spec['paths']
+        for path_def in paths.values():
+            for method_def in path_def.values():
+                assert 'requestBody' in method_def
+
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/examples/use_openapi.py b/examples/use_openapi.py
new file mode 100644
index 00000000..abfdd637
--- /dev/null
+++ b/examples/use_openapi.py
@@ -0,0 +1,34 @@
+"""
+In this example `openapi` version is used instead of `swagger` version.
+"""
+from flask import Flask
+from flasgger import Swagger
+
+app = Flask(__name__)
+swag = Swagger(app, config={
+    'headers': [],
+    'specs': [
+        {
+            'endpoint': 'apispec',
+            'route': '/apispec.json'
+        }
+    ],
+    'openapi': '3.0.1'
+})
+
+
+def test_swag(client, specs_data):
+    """
+    This test is runs automatically in Travis CI
+
+    :param client: Flask app test client
+    :param specs_data: {'url': {swag_specs}} for every spec in app
+    """
+    for spec in specs_data.values():
+        assert 'openapi' in spec
+        assert '3.0.1' == spec['openapi']
+        assert 'swagger' not in spec
+
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/flasgger/base.py b/flasgger/base.py
index b6f07952..d36fef52 100644
--- a/flasgger/base.py
+++ b/flasgger/base.py
@@ -118,9 +118,6 @@ def get(self):
         The Swagger view get method outputs to /apispecs_1.json
         """
         data = {
-            "swagger": self.config.get('swagger') or self.config.get(
-                'swagger_version', "2.0"
-            ),
             # try to get from config['SWAGGER']['info']
             # then config['SWAGGER']['specs'][x]
             # then config['SWAGGER']
@@ -145,6 +142,14 @@ def get(self):
             "definitions": self.config.get('definitions') or defaultdict(dict)
         }
 
+        openapi_version = self.config.get('openapi')
+        if openapi_version:
+            data["openapi"] = openapi_version
+        else:
+            data["swagger"] = self.config.get('swagger') or self.config.get(
+                'swagger_version', "2.0"
+            )
+
         # Support extension properties in the top level config
         top_level_extension_options = get_vendor_extension_fields(self.config)
         if top_level_extension_options:
@@ -210,6 +215,16 @@ def get(self):
                                             verb=verb,
                                             prefix_ids=prefix_ids)
 
+                request_body = swag.get('requestBody')
+                if request_body:
+                    content = request_body.get("content", {})
+                    extract_definitions(
+                        list(content.values()),
+                        endpoint=rule.endpoint,
+                        verb=verb,
+                        prefix_ids=prefix_ids
+                    )
+
                 responses = None
                 if 'responses' in swag:
                     responses = swag.get('responses', {})
@@ -237,6 +252,8 @@ def get(self):
                     operation['summary'] = swag.get('summary')
                 if swag.get('description'):
                     operation['description'] = swag.get('description')
+                if request_body:
+                    operation['requestBody'] = request_body
                 if responses:
                     operation['responses'] = responses
                 # parameters - swagger ui dislikes empty parameter lists