diff --git a/README.md b/README.md
index ad7fbce..d380e55 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ REST/HTTP binding (PSM) for the SysML v2 standard API.
 This Python package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
 
 - API version: 1.0.0
-- Package version: 2021-04
+- Package version: 2021-05
 - Build package: org.openapitools.codegen.languages.PythonClientCodegen
 
 ## Requirements.
@@ -120,6 +120,7 @@ Class | Method | HTTP request | Description
  - [Identified](docs/Identified.md)
  - [PrimitiveConstraint](docs/PrimitiveConstraint.md)
  - [Project](docs/Project.md)
+ - [ProjectDefaultBranch](docs/ProjectDefaultBranch.md)
  - [Query](docs/Query.md)
  - [Relationship](docs/Relationship.md)
 
diff --git a/docs/Project.md b/docs/Project.md
index a9cba19..580fc34 100644
--- a/docs/Project.md
+++ b/docs/Project.md
@@ -4,6 +4,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **type** | **str** |  | [optional] 
+**default_branch** | [**ProjectDefaultBranch**](ProjectDefaultBranch.md) |  | [optional] 
 **description** | **str** |  | [optional] 
 **id** | **str** |  | [optional] 
 **name** | **str** |  | [optional] 
diff --git a/docs/ProjectDefaultBranch.md b/docs/ProjectDefaultBranch.md
new file mode 100644
index 0000000..610ff07
--- /dev/null
+++ b/docs/ProjectDefaultBranch.md
@@ -0,0 +1,11 @@
+# ProjectDefaultBranch
+
+Branch
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**id** | **str** |  | [optional] 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/setup.py b/setup.py
index 09d96f7..56f2b47 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
 from setuptools import setup, find_packages  # noqa: H301
 
 NAME = "sysml-v2-api-client"
-VERSION = "2021-04"
+VERSION = "2021-05"
 # To install the library, run the following
 #
 # python setup.py install
diff --git a/sysml_v2_api_client/__init__.py b/sysml_v2_api_client/__init__.py
index 3c739d4..4964bd9 100644
--- a/sysml_v2_api_client/__init__.py
+++ b/sysml_v2_api_client/__init__.py
@@ -14,7 +14,7 @@
 
 from __future__ import absolute_import
 
-__version__ = "2021-04"
+__version__ = "2021-05"
 
 # import apis into sdk package
 from sysml_v2_api_client.api.branch_api import BranchApi
@@ -46,6 +46,7 @@
 from sysml_v2_api_client.models.identified import Identified
 from sysml_v2_api_client.models.primitive_constraint import PrimitiveConstraint
 from sysml_v2_api_client.models.project import Project
+from sysml_v2_api_client.models.project_default_branch import ProjectDefaultBranch
 from sysml_v2_api_client.models.query import Query
 from sysml_v2_api_client.models.relationship import Relationship
 
diff --git a/sysml_v2_api_client/api_client.py b/sysml_v2_api_client/api_client.py
index a729505..9bb340f 100644
--- a/sysml_v2_api_client/api_client.py
+++ b/sysml_v2_api_client/api_client.py
@@ -78,7 +78,7 @@ def __init__(self, configuration=None, header_name=None, header_value=None,
             self.default_headers[header_name] = header_value
         self.cookie = cookie
         # Set default User-Agent.
-        self.user_agent = 'OpenAPI-Generator/2021-04/python'
+        self.user_agent = 'OpenAPI-Generator/2021-05/python'
         self.client_side_validation = configuration.client_side_validation
 
     def __enter__(self):
diff --git a/sysml_v2_api_client/configuration.py b/sysml_v2_api_client/configuration.py
index 09aa984..b4c4c19 100644
--- a/sysml_v2_api_client/configuration.py
+++ b/sysml_v2_api_client/configuration.py
@@ -325,7 +325,7 @@ def to_debug_report(self):
                "OS: {env}\n"\
                "Python Version: {pyversion}\n"\
                "Version of the API: 1.0.0\n"\
-               "SDK Package Version: 2021-04".\
+               "SDK Package Version: 2021-05".\
                format(env=sys.platform, pyversion=sys.version)
 
     def get_host_settings(self):
diff --git a/sysml_v2_api_client/models/__init__.py b/sysml_v2_api_client/models/__init__.py
index f742af3..aa04ef4 100644
--- a/sysml_v2_api_client/models/__init__.py
+++ b/sysml_v2_api_client/models/__init__.py
@@ -27,5 +27,6 @@
 from sysml_v2_api_client.models.identified import Identified
 from sysml_v2_api_client.models.primitive_constraint import PrimitiveConstraint
 from sysml_v2_api_client.models.project import Project
+from sysml_v2_api_client.models.project_default_branch import ProjectDefaultBranch
 from sysml_v2_api_client.models.query import Query
 from sysml_v2_api_client.models.relationship import Relationship
diff --git a/sysml_v2_api_client/models/project.py b/sysml_v2_api_client/models/project.py
index aac60da..5487453 100644
--- a/sysml_v2_api_client/models/project.py
+++ b/sysml_v2_api_client/models/project.py
@@ -34,6 +34,7 @@ class Project(object):
     """
     openapi_types = {
         'type': 'str',
+        'default_branch': 'ProjectDefaultBranch',
         'description': 'str',
         'id': 'str',
         'name': 'str'
@@ -41,18 +42,20 @@ class Project(object):
 
     attribute_map = {
         'type': '@type',
+        'default_branch': 'defaultBranch',
         'description': 'description',
         'id': 'id',
         'name': 'name'
     }
 
-    def __init__(self, type=None, description=None, id=None, name=None, local_vars_configuration=None):  # noqa: E501
+    def __init__(self, type=None, default_branch=None, description=None, id=None, name=None, local_vars_configuration=None):  # noqa: E501
         """Project - a model defined in OpenAPI"""  # noqa: E501
         if local_vars_configuration is None:
             local_vars_configuration = Configuration()
         self.local_vars_configuration = local_vars_configuration
 
         self._type = None
+        self._default_branch = None
         self._description = None
         self._id = None
         self._name = None
@@ -60,6 +63,8 @@ def __init__(self, type=None, description=None, id=None, name=None, local_vars_c
 
         if type is not None:
             self.type = type
+        if default_branch is not None:
+            self.default_branch = default_branch
         if description is not None:
             self.description = description
         if id is not None:
@@ -94,6 +99,27 @@ def type(self, type):
 
         self._type = type
 
+    @property
+    def default_branch(self):
+        """Gets the default_branch of this Project.  # noqa: E501
+
+
+        :return: The default_branch of this Project.  # noqa: E501
+        :rtype: ProjectDefaultBranch
+        """
+        return self._default_branch
+
+    @default_branch.setter
+    def default_branch(self, default_branch):
+        """Sets the default_branch of this Project.
+
+
+        :param default_branch: The default_branch of this Project.  # noqa: E501
+        :type: ProjectDefaultBranch
+        """
+
+        self._default_branch = default_branch
+
     @property
     def description(self):
         """Gets the description of this Project.  # noqa: E501
diff --git a/sysml_v2_api_client/models/project_default_branch.py b/sysml_v2_api_client/models/project_default_branch.py
new file mode 100644
index 0000000..2c6137b
--- /dev/null
+++ b/sysml_v2_api_client/models/project_default_branch.py
@@ -0,0 +1,120 @@
+# coding: utf-8
+
+"""
+    SysML v2 API and Services
+
+    REST/HTTP binding (PSM) for the SysML v2 standard API.  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import pprint
+import re  # noqa: F401
+
+import six
+
+from sysml_v2_api_client.configuration import Configuration
+
+
+class ProjectDefaultBranch(object):
+    """NOTE: This class is auto generated by OpenAPI Generator.
+    Ref: https://openapi-generator.tech
+
+    Do not edit the class manually.
+    """
+
+    """
+    Attributes:
+      openapi_types (dict): The key is attribute name
+                            and the value is attribute type.
+      attribute_map (dict): The key is attribute name
+                            and the value is json key in definition.
+    """
+    openapi_types = {
+        'id': 'str'
+    }
+
+    attribute_map = {
+        'id': 'id'
+    }
+
+    def __init__(self, id=None, local_vars_configuration=None):  # noqa: E501
+        """ProjectDefaultBranch - a model defined in OpenAPI"""  # noqa: E501
+        if local_vars_configuration is None:
+            local_vars_configuration = Configuration()
+        self.local_vars_configuration = local_vars_configuration
+
+        self._id = None
+        self.discriminator = None
+
+        if id is not None:
+            self.id = id
+
+    @property
+    def id(self):
+        """Gets the id of this ProjectDefaultBranch.  # noqa: E501
+
+
+        :return: The id of this ProjectDefaultBranch.  # noqa: E501
+        :rtype: str
+        """
+        return self._id
+
+    @id.setter
+    def id(self, id):
+        """Sets the id of this ProjectDefaultBranch.
+
+
+        :param id: The id of this ProjectDefaultBranch.  # noqa: E501
+        :type: str
+        """
+
+        self._id = id
+
+    def to_dict(self):
+        """Returns the model properties as a dict"""
+        result = {}
+
+        for attr, _ in six.iteritems(self.openapi_types):
+            value = getattr(self, attr)
+            if isinstance(value, list):
+                result[attr] = list(map(
+                    lambda x: x.to_dict() if hasattr(x, "to_dict") else x,
+                    value
+                ))
+            elif hasattr(value, "to_dict"):
+                result[attr] = value.to_dict()
+            elif isinstance(value, dict):
+                result[attr] = dict(map(
+                    lambda item: (item[0], item[1].to_dict())
+                    if hasattr(item[1], "to_dict") else item,
+                    value.items()
+                ))
+            else:
+                result[attr] = value
+
+        return result
+
+    def to_str(self):
+        """Returns the string representation of the model"""
+        return pprint.pformat(self.to_dict())
+
+    def __repr__(self):
+        """For `print` and `pprint`"""
+        return self.to_str()
+
+    def __eq__(self, other):
+        """Returns true if both objects are equal"""
+        if not isinstance(other, ProjectDefaultBranch):
+            return False
+
+        return self.to_dict() == other.to_dict()
+
+    def __ne__(self, other):
+        """Returns true if both objects are not equal"""
+        if not isinstance(other, ProjectDefaultBranch):
+            return True
+
+        return self.to_dict() != other.to_dict()
diff --git a/test/test_project.py b/test/test_project.py
index bfe91f0..93f500b 100644
--- a/test/test_project.py
+++ b/test/test_project.py
@@ -37,6 +37,8 @@ def make_instance(self, include_optional):
         if include_optional :
             return Project(
                 type = 'Project', 
+                default_branch = sysml_v2_api_client.models.project_default_branch.Project_defaultBranch(
+                    id = '0', ), 
                 description = '0', 
                 id = '0', 
                 name = '0'
diff --git a/test/test_project_default_branch.py b/test/test_project_default_branch.py
new file mode 100644
index 0000000..5ae2bf5
--- /dev/null
+++ b/test/test_project_default_branch.py
@@ -0,0 +1,52 @@
+# coding: utf-8
+
+"""
+    SysML v2 API and Services
+
+    REST/HTTP binding (PSM) for the SysML v2 standard API.  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+from __future__ import absolute_import
+
+import unittest
+import datetime
+
+import sysml_v2_api_client
+from sysml_v2_api_client.models.project_default_branch import ProjectDefaultBranch  # noqa: E501
+from sysml_v2_api_client.rest import ApiException
+
+class TestProjectDefaultBranch(unittest.TestCase):
+    """ProjectDefaultBranch unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def make_instance(self, include_optional):
+        """Test ProjectDefaultBranch
+            include_option is a boolean, when False only required
+            params are included, when True both required and
+            optional params are included """
+        # model = sysml_v2_api_client.models.project_default_branch.ProjectDefaultBranch()  # noqa: E501
+        if include_optional :
+            return ProjectDefaultBranch(
+                id = '0'
+            )
+        else :
+            return ProjectDefaultBranch(
+        )
+
+    def testProjectDefaultBranch(self):
+        """Test ProjectDefaultBranch"""
+        inst_req_only = self.make_instance(include_optional=False)
+        inst_req_and_optional = self.make_instance(include_optional=True)
+
+
+if __name__ == '__main__':
+    unittest.main()