diff --git a/openapi/components/parameters.yaml b/openapi/components/parameters.yaml
index 170a4bbe..94f6de35 100644
--- a/openapi/components/parameters.yaml
+++ b/openapi/components/parameters.yaml
@@ -23,6 +23,13 @@ sort:
   schema:
     $ref: ./schemas/SortOption.yaml
   description: The sort order of the results.
+groupMemberSort:
+  name: sort
+  in: query
+  required: false
+  schema:
+    $ref: ./schemas/GroupSearchSort.yaml
+  description: The sort order of Group Member results
 order:
   name: order
   in: query
diff --git a/openapi/components/paths/groups.yaml b/openapi/components/paths/groups.yaml
index a71f1d90..8b620633 100644
--- a/openapi/components/paths/groups.yaml
+++ b/openapi/components/paths/groups.yaml
@@ -505,6 +505,7 @@ paths:
       parameters:
         - $ref: ../parameters.yaml#/number
         - $ref: ../parameters.yaml#/offset
+        - $ref: ../parameters.yaml#/groupMemberSort
       responses:
         '200':
           $ref: ../responses/groups/GroupMemberListResponse.yaml
diff --git a/openapi/components/schemas/GroupMember.yaml b/openapi/components/schemas/GroupMember.yaml
index 3bf0f667..d3ef1d1a 100644
--- a/openapi/components/schemas/GroupMember.yaml
+++ b/openapi/components/schemas/GroupMember.yaml
@@ -19,6 +19,10 @@ properties:
     type: array
     items:
       $ref: ./GroupRoleID.yaml
+  mRoleIds:
+    type: array
+    items:
+      $ref: ./GroupRoleID.yaml
   joinedAt:
     type: string
     format: date-time
@@ -44,4 +48,9 @@ properties:
   managerNotes:
     description: "Only visible via the /groups/:groupId/members endpoint, **not** when fetching a specific user."
     type: string
-    nullable: true
\ No newline at end of file
+    nullable: true
+  lastPostReadAt:
+    type: string
+    format: date-time
+  hasJoinedFromPurchase:
+    type: boolean
\ No newline at end of file
diff --git a/openapi/components/schemas/GroupMemberLimitedUser.yaml b/openapi/components/schemas/GroupMemberLimitedUser.yaml
index 15da7b86..aaacd788 100644
--- a/openapi/components/schemas/GroupMemberLimitedUser.yaml
+++ b/openapi/components/schemas/GroupMemberLimitedUser.yaml
@@ -9,4 +9,12 @@ properties:
   thumbnailUrl:
     type: string
   iconUrl:
-    type: string
\ No newline at end of file
+    type: string
+  profilePicOverride:
+    type: string
+  currentAvatarThumbnailImageUrl:
+    type: string
+  currentAvatarTags:
+    type: array
+    items:
+      $ref: ./Tag.yaml
\ No newline at end of file
diff --git a/openapi/components/schemas/GroupSearchSort.yaml b/openapi/components/schemas/GroupSearchSort.yaml
new file mode 100644
index 00000000..59f31742
--- /dev/null
+++ b/openapi/components/schemas/GroupSearchSort.yaml
@@ -0,0 +1,6 @@
+title: GroupSearchSort
+type: string
+enum:
+  - joinedAt:asc
+  - joinedAt:desc
+example: joinedAt:asc
\ No newline at end of file