diff --git a/src/keycloak/keycloak_admin.py b/src/keycloak/keycloak_admin.py
index 9a60e07..91d2c50 100644
--- a/src/keycloak/keycloak_admin.py
+++ b/src/keycloak/keycloak_admin.py
@@ -1561,6 +1561,142 @@ class KeycloakAdmin:
         )
         return raise_error_from_response(data_raw, KeycloakGetError)
 
+    def get_client_default_client_scopes(self, client_id):
+        """Get all default client scopes from client.
+
+        :param client_id: id of the client in which the new default client scope should be added
+        :type client_id: str
+
+        :return: list of client scopes with id and name
+        :rtype: list
+        """
+        params_path = {"realm-name": self.realm_name, "id": client_id}
+        data_raw = self.raw_get(
+            urls_patterns.URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPES.format(**params_path)
+        )
+        return raise_error_from_response(data_raw, KeycloakGetError)
+
+    def add_client_default_client_scope(self, client_id, client_scope_id, payload):
+        """Add a client scope to the default client scopes from client.
+
+        Payload example::
+
+            payload={
+                "realm":"testrealm",
+                "client":"aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+                "clientScopeId":"bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"
+            }
+
+        :param client_id: id of the client in which the new default client scope should be added
+        :type client_id: str
+        :param client_scope_id: id of the new client scope that should be added
+        :type client_scope_id: str
+        :param payload: dictionary with realm, client and clientScopeId
+        :type payload: dict
+
+        :return: Http response
+        :rtype: bytes
+        """
+        params_path = {
+            "realm-name": self.realm_name,
+            "id": client_id,
+            "client_scope_id": client_scope_id,
+        }
+        data_raw = self.raw_put(
+            urls_patterns.URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPE.format(**params_path),
+            data=json.dumps(payload),
+        )
+        return raise_error_from_response(data_raw, KeycloakPutError)
+
+    def delete_client_default_client_scope(self, client_id, client_scope_id):
+        """Delete a client scope from the default client scopes of the client.
+
+        :param client_id: id of the client in which the default client scope should be deleted
+        :type client_id: str
+        :param client_scope_id: id of the client scope that should be deleted
+        :type client_scope_id: str
+
+        :return: list of client scopes with id and name
+        :rtype: list
+        """
+        params_path = {
+            "realm-name": self.realm_name,
+            "id": client_id,
+            "client_scope_id": client_scope_id,
+        }
+        data_raw = self.raw_delete(
+            urls_patterns.URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPE.format(**params_path)
+        )
+        return raise_error_from_response(data_raw, KeycloakDeleteError)
+
+    def get_client_optional_client_scopes(self, client_id):
+        """Get all optional client scopes from client.
+
+        :param client_id: id of the client in which the new optional client scope should be added
+        :type client_id: str
+
+        :return: list of client scopes with id and name
+        :rtype: list
+        """
+        params_path = {"realm-name": self.realm_name, "id": client_id}
+        data_raw = self.raw_get(
+            urls_patterns.URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPES.format(**params_path)
+        )
+        return raise_error_from_response(data_raw, KeycloakGetError)
+
+    def add_client_optional_client_scope(self, client_id, client_scope_id, payload):
+        """Add a client scope to the optional client scopes from client.
+
+        Payload example::
+
+            payload={
+                "realm":"testrealm",
+                "client":"aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+                "clientScopeId":"bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"
+            }
+
+        :param client_id: id of the client in which the new optional client scope should be added
+        :type client_id: str
+        :param client_scope_id: id of the new client scope that should be added
+        :type client_scope_id: str
+        :param payload: dictionary with realm, client and clientScopeId
+        :type payload: dict
+
+        :return: Http response
+        :rtype: bytes
+        """
+        params_path = {
+            "realm-name": self.realm_name,
+            "id": client_id,
+            "client_scope_id": client_scope_id,
+        }
+        data_raw = self.raw_put(
+            urls_patterns.URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPE.format(**params_path),
+            data=json.dumps(payload),
+        )
+        return raise_error_from_response(data_raw, KeycloakPutError)
+
+    def delete_client_optional_client_scope(self, client_id, client_scope_id):
+        """Delete a client scope from the optional client scopes of the client.
+
+        :param client_id: id of the client in which the optional client scope should be deleted
+        :type client_id: str
+        :param client_scope_id: id of the client scope that should be deleted
+        :type client_scope_id: str
+
+        :return: list of client scopes with id and name
+        :rtype: list
+        """
+        params_path = {
+            "realm-name": self.realm_name,
+            "id": client_id,
+            "client_scope_id": client_scope_id,
+        }
+        data_raw = self.raw_delete(
+            urls_patterns.URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPE.format(**params_path)
+        )
+        return raise_error_from_response(data_raw, KeycloakDeleteError)
+
     def create_client(self, payload, skip_exists=False):
         """Create a client.
 
diff --git a/src/keycloak/urls_patterns.py b/src/keycloak/urls_patterns.py
index 4ea0449..d8c5f0f 100644
--- a/src/keycloak/urls_patterns.py
+++ b/src/keycloak/urls_patterns.py
@@ -95,6 +95,14 @@ URL_ADMIN_CLIENT_SCOPE_MAPPINGS_REALM_ROLES = URL_ADMIN_CLIENT + "/scope-mapping
 URL_ADMIN_CLIENT_SCOPE_MAPPINGS_CLIENT_ROLES = (
     URL_ADMIN_CLIENT + "/scope-mappings/clients/{client}"
 )
+URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPES = URL_ADMIN_CLIENT + "/optional-client-scopes"
+URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPE = (
+    URL_ADMIN_CLIENT_OPTIONAL_CLIENT_SCOPES + "/{client_scope_id}"
+)
+URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPES = URL_ADMIN_CLIENT + "/default-client-scopes"
+URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPE = (
+    URL_ADMIN_CLIENT_DEFAULT_CLIENT_SCOPES + "/{client_scope_id}"
+)
 
 URL_ADMIN_CLIENT_AUTHZ_SETTINGS = URL_ADMIN_CLIENT + "/authz/resource-server/settings"
 URL_ADMIN_CLIENT_AUTHZ_RESOURCES = URL_ADMIN_CLIENT + "/authz/resource-server/resource?max=-1"
diff --git a/tests/test_keycloak_admin.py b/tests/test_keycloak_admin.py
index 2ec7f8b..5b1cf06 100644
--- a/tests/test_keycloak_admin.py
+++ b/tests/test_keycloak_admin.py
@@ -1327,6 +1327,98 @@ def test_client_scope_client_roles(admin: KeycloakAdmin, realm: str, client: str
     assert len(roles) == 0
 
 
+def test_client_default_client_scopes(admin: KeycloakAdmin, realm: str, client: str):
+    """Test client assignment of default client scopes.
+
+    :param admin: Keycloak admin
+    :type admin: KeycloakAdmin
+    :param realm: Keycloak realm
+    :type realm: str
+    :param client: Keycloak client
+    :type client: str
+    """
+    admin.realm_name = realm
+
+    client_id = admin.create_client(
+        payload={"name": "role-testing-client", "clientId": "role-testing-client"}
+    )
+    # Test get client default scopes
+    # keycloak default roles: web-origins, acr, profile, roles, email
+    default_client_scopes = admin.get_client_default_client_scopes(client_id)
+    assert len(default_client_scopes) == 5, default_client_scopes
+
+    # Test add a client scope to client default scopes
+    default_client_scope = "test-client-default-scope"
+    new_client_scope = {
+        "name": default_client_scope,
+        "description": f"Test Client Scope: {default_client_scope}",
+        "protocol": "openid-connect",
+        "attributes": {},
+    }
+    new_client_scope_id = admin.create_client_scope(new_client_scope, skip_exists=False)
+    new_default_client_scope_data = {
+        "realm": realm,
+        "client": client_id,
+        "clientScopeId": new_client_scope_id,
+    }
+    admin.add_client_default_client_scope(
+        client_id, new_client_scope_id, new_default_client_scope_data
+    )
+    default_client_scopes = admin.get_client_default_client_scopes(client_id)
+    assert len(default_client_scopes) == 6, default_client_scopes
+
+    # Test remove a client default scope
+    admin.delete_client_default_client_scope(client_id, new_client_scope_id)
+    default_client_scopes = admin.get_client_default_client_scopes(client_id)
+    assert len(default_client_scopes) == 5, default_client_scopes
+
+
+def test_client_optional_client_scopes(admin: KeycloakAdmin, realm: str, client: str):
+    """Test client assignment of optional client scopes.
+
+    :param admin: Keycloak admin
+    :type admin: KeycloakAdmin
+    :param realm: Keycloak realm
+    :type realm: str
+    :param client: Keycloak client
+    :type client: str
+    """
+    admin.realm_name = realm
+
+    client_id = admin.create_client(
+        payload={"name": "role-testing-client", "clientId": "role-testing-client"}
+    )
+    # Test get client optional scopes
+    # keycloak optional roles: microprofile-jwt, offline_access, address, phone
+    optional_client_scopes = admin.get_client_optional_client_scopes(client_id)
+    assert len(optional_client_scopes) == 4, optional_client_scopes
+
+    # Test add a client scope to client optional scopes
+    optional_client_scope = "test-client-optional-scope"
+    new_client_scope = {
+        "name": optional_client_scope,
+        "description": f"Test Client Scope: {optional_client_scope}",
+        "protocol": "openid-connect",
+        "attributes": {},
+    }
+    new_client_scope_id = admin.create_client_scope(new_client_scope, skip_exists=False)
+    new_optional_client_scope_data = {
+        "realm": realm,
+        "client": client_id,
+        "clientScopeId": new_client_scope_id,
+    }
+    admin.add_client_optional_client_scope(
+        client_id, new_client_scope_id, new_optional_client_scope_data
+    )
+    optional_client_scopes = admin.get_client_optional_client_scopes(client_id)
+    assert len(optional_client_scopes) == 5, optional_client_scopes
+
+    # Test remove a client optional scope
+    admin.delete_client_optional_client_scope(client_id, new_client_scope_id)
+    optional_client_scopes = admin.get_client_optional_client_scopes(client_id)
+    assert len(optional_client_scopes) == 4, optional_client_scopes
+
+
 def test_client_roles(admin: KeycloakAdmin, client: str):
     """Test client roles.