diff --git a/multi_user/handlers.py b/multi_user/handlers.py
index 90f1bed..d6f936e 100644
--- a/multi_user/handlers.py
+++ b/multi_user/handlers.py
@@ -79,8 +79,6 @@ def on_scene_update(scene):
             logging.debug(f"Ignoring distant update of {dependency_updates[0].id.name}")
             return
 
-        update_external_dependencies()
-
         # NOTE: maybe we don't need to check each update but only the first
         for update in reversed(dependency_updates):
             update_uuid = getattr(update.id, 'uuid', None)
@@ -109,6 +107,11 @@ def on_scene_update(scene):
                 porcelain.commit(session.repository, scn_uuid)
                 porcelain.push(session.repository, 'origin', scn_uuid)
 
+        scene_graph_changed = [u for u in reversed(dependency_updates) if getattr(u.id, 'uuid', None) and isinstance(u.id,(bpy.types.Scene,bpy.types.Collection))] 
+        if scene_graph_changed:
+            porcelain.purge_orphan_nodes(session.repository)
+
+        update_external_dependencies()
 
 @persistent
 def resolve_deps_graph(dummy):
diff --git a/multi_user/libs/replication b/multi_user/libs/replication
index a44313e..15dc5c6 160000
--- a/multi_user/libs/replication
+++ b/multi_user/libs/replication
@@ -1 +1 @@
-Subproject commit a44313e6473bfb514bb2fb79fce5e1abf172dc87
+Subproject commit 15dc5c62c07a3e0025a82d87022f5073c019e7e9
diff --git a/multi_user/operators.py b/multi_user/operators.py
index 47b9778..43148ed 100644
--- a/multi_user/operators.py
+++ b/multi_user/operators.py
@@ -689,7 +689,6 @@ class SessionPurgeOperator(bpy.types.Operator):
 
     def execute(self, context):
         try:
-            sanitize_deps_graph(remove_nodes=True)
             porcelain.purge_orphan_nodes(session.repository)
         except Exception as e:
             self.report({'ERROR'}, repr(e))