diff --git a/docs/Group.md b/docs/Group.md
index 2d93040..7f2859b 100644
--- a/docs/Group.md
+++ b/docs/Group.md
@@ -22,9 +22,9 @@ Name | Type | Description | Notes
 **member_count_synced_at** | Option<**String**> |  | [optional]
 **is_verified** | Option<**bool**> |  | [optional][default to false]
 **join_state** | Option<[**models::GroupJoinState**](GroupJoinState.md)> |  | [optional]
-**tags** | Option<**Vec<String>**> |   | [optional]
+**tags** | Option<**Vec<String>**> |  | [optional]
 **transfer_target_id** | Option<**String**> | A users unique ID, usually in the form of `usr_c1644b5b-3ca4-45b4-97c6-a2a0de70d469`. Legacy players can have old IDs in the form of `8JoV9XEdpo`. The ID can never be changed. | [optional]
-**galleries** | Option<[**Vec<models::GroupGallery>**](GroupGallery.md)> |   | [optional]
+**galleries** | Option<[**Vec<models::GroupGallery>**](GroupGallery.md)> |  | [optional]
 **created_at** | Option<**String**> |  | [optional]
 **updated_at** | Option<**String**> |  | [optional]
 **last_post_created_at** | Option<**String**> |  | [optional]
diff --git a/docs/UserExists.md b/docs/UserExists.md
index 17b947c..62fd89f 100644
--- a/docs/UserExists.md
+++ b/docs/UserExists.md
@@ -5,6 +5,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **user_exists** | **bool** | Status if a user exist with that username or userId. | [default to false]
+**name_ok** | **bool** | Is the username valid? | [default to false]
 
 [[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/src/models/group.rs b/src/models/group.rs
index 3b94caa..54b7d78 100644
--- a/src/models/group.rs
+++ b/src/models/group.rs
@@ -59,8 +59,8 @@ pub struct Group {
     pub created_at: Option<String>,
     #[serde(rename = "updatedAt", skip_serializing_if = "Option::is_none")]
     pub updated_at: Option<String>,
-    #[serde(rename = "lastPostCreatedAt", skip_serializing_if = "Option::is_none")]
-    pub last_post_created_at: Option<String>,
+    #[serde(rename = "lastPostCreatedAt", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub last_post_created_at: Option<Option<String>>,
     #[serde(rename = "onlineMemberCount", skip_serializing_if = "Option::is_none")]
     pub online_member_count: Option<i32>,
     #[serde(rename = "membershipStatus", skip_serializing_if = "Option::is_none")]
diff --git a/src/models/group_my_member.rs b/src/models/group_my_member.rs
index 33ae2af..ab3a3c7 100644
--- a/src/models/group_my_member.rs
+++ b/src/models/group_my_member.rs
@@ -20,8 +20,8 @@ pub struct GroupMyMember {
     pub user_id: Option<String>,
     #[serde(rename = "roleIds", skip_serializing_if = "Option::is_none")]
     pub role_ids: Option<Vec<String>>,
-    #[serde(rename = "acceptedByDisplayName", skip_serializing_if = "Option::is_none")]
-    pub accepted_by_display_name: Option<String>,
+    #[serde(rename = "acceptedByDisplayName", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub accepted_by_display_name: Option<Option<String>>,
     /// A users unique ID, usually in the form of `usr_c1644b5b-3ca4-45b4-97c6-a2a0de70d469`. Legacy players can have old IDs in the form of `8JoV9XEdpo`. The ID can never be changed.
     #[serde(rename = "acceptedById", skip_serializing_if = "Option::is_none")]
     pub accepted_by_id: Option<String>,
@@ -45,8 +45,8 @@ pub struct GroupMyMember {
     pub has2_fa: Option<bool>,
     #[serde(rename = "hasJoinedFromPurchase", skip_serializing_if = "Option::is_none")]
     pub has_joined_from_purchase: Option<bool>,
-    #[serde(rename = "lastPostReadAt", skip_serializing_if = "Option::is_none")]
-    pub last_post_read_at: Option<String>,
+    #[serde(rename = "lastPostReadAt", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub last_post_read_at: Option<Option<String>>,
     #[serde(rename = "mRoleIds", skip_serializing_if = "Option::is_none")]
     pub m_role_ids: Option<Vec<String>>,
     #[serde(rename = "permissions", skip_serializing_if = "Option::is_none")]
diff --git a/src/models/user_exists.rs b/src/models/user_exists.rs
index b1675a9..017b7e7 100644
--- a/src/models/user_exists.rs
+++ b/src/models/user_exists.rs
@@ -15,13 +15,17 @@ pub struct UserExists {
     /// Status if a user exist with that username or userId.
     #[serde(rename = "userExists")]
     pub user_exists: bool,
+    /// Is the username valid?
+    #[serde(rename = "nameOk")]
+    pub name_ok: bool,
 }
 
 impl UserExists {
     /// Status object representing if a queried user by username or userId exists or not. This model is primarily used by the `/auth/exists` endpoint, which in turn is used during registration. Please see the documentation on that endpoint for more information on usage.
-    pub fn new(user_exists: bool) -> UserExists {
+    pub fn new(user_exists: bool, name_ok: bool) -> UserExists {
         UserExists {
             user_exists,
+            name_ok,
         }
     }
 }