diff --git a/bioblend/_tests/TestGalaxyQuotas.py b/bioblend/_tests/TestGalaxyQuotas.py
index 4d523f273..701465735 100644
--- a/bioblend/_tests/TestGalaxyQuotas.py
+++ b/bioblend/_tests/TestGalaxyQuotas.py
@@ -1,6 +1,9 @@
 import uuid
 
-from . import GalaxyTestBase
+from . import (
+    GalaxyTestBase,
+    test_util,
+)
 
 
 class TestGalaxyQuotas(GalaxyTestBase.GalaxyTestBase):
@@ -52,3 +55,29 @@ def test_delete_undelete_quota(self):
         assert response == "Deleted 1 quotas: " + self.quota_name
         response = self.gi.quotas.undelete_quota(self.quota["id"])
         assert response == "Undeleted 1 quotas: " + self.quota_name
+
+    @test_util.skip_unless_galaxy("release_19.09")  # for user purging
+    def test_update_non_default_quota(self):
+        """
+        Test updating a non default quota.
+        Needs to use `default=None` (which is the default), `default="no"` will fail.
+        """
+        if self.gi.config.get_config()["use_remote_user"]:
+            self.skipTest("This Galaxy instance is not configured to use local users")
+        new_username = test_util.random_string()
+        new_user_email = f"{new_username}@example.org"
+        password = test_util.random_string(20)
+        new_user = self.gi.users.create_local_user(new_username, new_user_email, password)
+
+        quota = self.gi.quotas.create_quota(
+            name="non_default_quota",
+            description="testing",
+            amount="100 GB",
+            operation="+",
+            in_users=[new_user["id"]],
+        )
+        self.gi.quotas.update_quota(quota["id"], amount="200 GB")
+
+        if self.gi.config.get_config()["allow_user_deletion"]:
+            self.gi.users.delete_user(new_user["id"])
+            self.gi.users.delete_user(new_user["id"], purge=True)
diff --git a/bioblend/galaxy/quotas/__init__.py b/bioblend/galaxy/quotas/__init__.py
index c0659e785..74d6fd69a 100644
--- a/bioblend/galaxy/quotas/__init__.py
+++ b/bioblend/galaxy/quotas/__init__.py
@@ -17,6 +17,7 @@
     from bioblend.galaxy import GalaxyInstance
 
 QuotaOperations = Literal["+", "-", "="]
+DefaultQuotaValues = Literal["no", "registered", "unregistered"]
 
 
 class QuotaClient(Client):
@@ -80,7 +81,7 @@ def create_quota(
         description: str,
         amount: str,
         operation: QuotaOperations,
-        default: Optional[Literal["no", "registered", "unregistered"]] = "no",
+        default: Optional[DefaultQuotaValues] = "no",
         in_users: Optional[List[str]] = None,
         in_groups: Optional[List[str]] = None,
     ) -> Dict[str, Any]:
@@ -101,8 +102,8 @@ def create_quota(
 
         :type default: str
         :param default: Whether or not this is a default quota. Valid values
-                        are ``no``, ``unregistered``, ``registered``. None is
-                        equivalent to ``no``.
+                        are "no", "unregistered", "registered" and None. None is
+                        equivalent to "no".
 
         :type in_users: list of str
         :param in_users: A list of user IDs or user emails.
@@ -141,8 +142,8 @@ def update_quota(
         name: Optional[str] = None,
         description: Optional[str] = None,
         amount: Optional[str] = None,
-        operation: Optional[QuotaOperations] = None,
-        default: str = "no",
+        operation: Optional[QuotaOperations] = "=",
+        default: Optional[DefaultQuotaValues] = None,
         in_users: Optional[List[str]] = None,
         in_groups: Optional[List[str]] = None,
     ) -> str:
@@ -169,10 +170,10 @@ def update_quota(
 
         :type default: str
         :param default: Whether or not this is a default quota. Valid values
-                        are ``no``, ``unregistered``, ``registered``.
+                        are "no", "unregistered", "registered" and None.
                         Calling this method with ``default="no"`` on a
-                        non-default quota will throw an error. Not
-                        passing this parameter is equivalent to passing ``no``.
+                        non-default quota will throw an error. Passing None is
+                        equivalent to not changing the current status.
 
         :type in_users: list of str
         :param in_users: A list of user IDs or user emails.