diff --git a/examples/IOC_data.ipynb b/examples/IOC_data.ipynb
index 678c290..65d096e 100644
--- a/examples/IOC_data.ipynb
+++ b/examples/IOC_data.ipynb
@@ -119,7 +119,7 @@
    },
    "outputs": [],
    "source": [
-    "east_stations[~east_stations.contacts.str.contains(\"NOAA\")]"
+    "east_stations[~east_stations.contacts.str.contains(\"NOAA\", na=False)]"
    ]
   },
   {
@@ -253,7 +253,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "python3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -267,7 +267,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.16"
+   "version": "3.10.9"
   }
  },
  "nbformat": 4,