diff --git a/g3w-admin/qdjango/views/projects.py b/g3w-admin/qdjango/views/projects.py
index 4a55cf6bb..27bd6fec7 100644
--- a/g3w-admin/qdjango/views/projects.py
+++ b/g3w-admin/qdjango/views/projects.py
@@ -615,6 +615,13 @@ def post(self, request, *args, **kwargs):
         if 'external' in request.POST:
             layer.external = int(request.POST['external'])
         layer.save()
+
+        # Invalidate project cache
+        layer.project.invalidate_cache()
+        logging.getLogger("g3wadmin.debug").debug(
+            f"Qdjango project /api/config invalidate cache after update layer data: {layer.project}"
+        )
+
         return JsonResponse({'Saved': 'ok'})