diff --git a/examples/Parallel_computing.ipynb b/examples/Parallel_computing.ipynb
index caf86417d..9bc92d801 100644
--- a/examples/Parallel_computing.ipynb
+++ b/examples/Parallel_computing.ipynb
@@ -115,13 +115,13 @@
     "    simulator_data=SimulatorData(\n",
     "        contact_parameters=SoftContactsParams(K=1e6, D=2e3, mu=0.5),\n",
     "    ),\n",
-    ").mutable(validate=False)\n",
+    ")\n",
     "\n",
     "\n",
     "# Add model to simulator\n",
     "model = simulator.insert_model_from_description(\n",
     "    model_description=model_sdf_string\n",
-    ").mutable(validate=True)"
+    ")"
    ]
   },
   {