diff --git a/pillarsdk/nodes.py b/pillarsdk/nodes.py
index 6902ee9..735a80e 100755
--- a/pillarsdk/nodes.py
+++ b/pillarsdk/nodes.py
@@ -54,6 +54,17 @@ class Node(List, Find, Create, Post, Update, Delete, Replace):
             raise ResourceNotFound(response)
 
     def update(self, attributes=None, api=None):
+        def pop_none_attributes(attributes):
+            """Return a new dict with all None values removed"""
+            out = {}
+            for k, v in attributes.iteritems():
+                if v:
+                    if type(v) is dict:
+                        attributes[k] = pop_none_attributes(v)
+                    else:
+                        out[k] = v
+            return out
+
         api = api or self.api
         attributes = attributes or self.to_dict()
         etag = attributes['_etag']
@@ -63,9 +74,11 @@ class Node(List, Find, Create, Post, Update, Delete, Replace):
         attributes.pop('_updated')
         attributes.pop('_links', None)
         attributes.pop('allowed_methods')
-        for attr in ['parent', 'picture']:
-            if attr in attributes and attributes[attr] is None:
-                attributes.pop(attr, None)
+        # for attr in ['parent', 'picture']:
+        #     if attr in attributes and attributes[attr] is None:
+        #         attributes.pop(attr, None)
+        pop_none_attributes(attributes)
+
         url = utils.join_url(self.path, str(self['_id']))
         headers = utils.merge_dict(
             self.http_headers(),