diff --git a/notebooks/demonstration-pymatgen-for-optimade-queries.ipynb b/notebooks/demonstration-pymatgen-for-optimade-queries.ipynb
index 482ec23..cb31a16 100644
--- a/notebooks/demonstration-pymatgen-for-optimade-queries.ipynb
+++ b/notebooks/demonstration-pymatgen-for-optimade-queries.ipynb
@@ -92,7 +92,7 @@
         "outputId": "b756287e-3d19-444d-f91c-c4aea6c440a6"
       },
       "source": [
-        "!pip install pymatgen pybtex"
+        "!pip install pymatgen pybtex retrying"
       ],
       "execution_count": 103,
       "outputs": [