diff --git a/core/server/api/v2/utils/serializers/input/posts.js b/core/server/api/v2/utils/serializers/input/posts.js
index 6a4d271d61..a887c9a211 100644
--- a/core/server/api/v2/utils/serializers/input/posts.js
+++ b/core/server/api/v2/utils/serializers/input/posts.js
@@ -108,30 +108,6 @@ module.exports = {
             delete frame.data.posts[0].author;
         }
 
-        /**
-         * CASE: we don't support updating nested-nested relations e.g. `post.authors[*].roles` yet.
-         *
-         * Bookshelf-relations supports this feature, BUT bookshelf's `hasChanged` fn will currently
-         * clash with this, because `hasChanged` won't be able to tell if relations have changed or not.
-         * It would always return `changed.roles = [....]`. It would always throw a model event that relations
-         * were updated, which is not true.
-         *
-         * Bookshelf-relations can tell us if a relation has changed, it knows that.
-         * But the connection between our model layer, Bookshelf's `hasChanged` fn and Bookshelf-relations
-         * is not present. As long as we don't support this case, we have to ignore this.
-         */
-        if (frame.data.posts[0].authors && frame.data.posts[0].authors.length) {
-            _.each(frame.data.posts[0].authors, (author, index) => {
-                if (author.hasOwnProperty('roles')) {
-                    delete frame.data.posts[0].authors[index].roles;
-                }
-
-                if (author.hasOwnProperty('permissions')) {
-                    delete frame.data.posts[0].authors[index].permissions;
-                }
-            });
-        }
-
         /**
          * Model notation is: `tag.parent_id`.
          * The API notation is `tag.parent`.
diff --git a/core/server/api/v2/utils/validators/input/schemas/posts.json b/core/server/api/v2/utils/validators/input/schemas/posts.json
index a0ebfb4814..2049934c5d 100644
--- a/core/server/api/v2/utils/validators/input/schemas/posts.json
+++ b/core/server/api/v2/utils/validators/input/schemas/posts.json
@@ -142,6 +142,12 @@
                     "email": {
                         "type": "string",
                         "maxLength": 191
+                    },
+                    "roles": {
+                        "strip": true
+                    },
+                    "permissions": {
+                        "strip": true
                     }
                 },
                 "anyOf": [