diff --git a/magnum_ui/api/magnum.py b/magnum_ui/api/magnum.py
index 839c96de..6d406be8 100644
--- a/magnum_ui/api/magnum.py
+++ b/magnum_ui/api/magnum.py
@@ -35,6 +35,7 @@ CLUSTER_TEMPLATE_CREATE_ATTRS = cluster_templates.CREATION_ATTRIBUTES
 CLUSTER_CREATE_ATTRS = clusters.CREATION_ATTRIBUTES
 CERTIFICATE_CREATE_ATTRS = certificates.CREATION_ATTRIBUTES
 QUOTA_CREATION_ATTRIBUTES = quotas.CREATION_ATTRIBUTES
+CLUSTER_UPDATE_ALLOWED_PROPERTIES = set(['/node_count'])
 
 
 def _cleanup_params(attrs, create, **params):
@@ -138,6 +139,11 @@ def cluster_template_update(request, id, **kwargs):
     old = magnumclient(request).cluster_templates.get(id).to_dict()
     old = _cleanup_params(CLUSTER_TEMPLATE_CREATE_ATTRS, False, **old)
     patch = _create_patches(old, new)
+    # NOTE(flwang): Now Magnum only support updating the node count for
+    # cluster upddate action. So let's simplify it by only passing the
+    # /node_count dict which can avoid many potential bugs.
+    patch = [d for d in patch if d['path']
+             in CLUSTER_UPDATE_ALLOWED_PROPERTIES]
     return magnumclient(request).cluster_templates.update(id, patch)