diff --git a/doc/source/examples/trustscore_mnist.ipynb b/doc/source/examples/trustscore_mnist.ipynb
index 8caf4d2d8..bfb027175 100644
--- a/doc/source/examples/trustscore_mnist.ipynb
+++ b/doc/source/examples/trustscore_mnist.ipynb
@@ -546,7 +546,7 @@
    ],
    "source": [
     "plt.figure(figsize=(20, 4))\n",
-    "for i in range(n):\n",
+    "for i in range(min(n, len(idx_low))): # in case fewer than n instances are found\n",
     "    ax = plt.subplot(1, n, i+1)\n",
     "    plt.imshow(imgs_low[i].reshape(28, 28))\n",
     "    plt.title('Model prediction: {} (p={:.2f}) \\n Label: {} \\n Trust score: {:.3f}' \\\n",
@@ -782,7 +782,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
   },
@@ -796,7 +796,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.13"
+   "version": "3.9.13"
   }
  },
  "nbformat": 4,
diff --git a/testing/test_notebooks.py b/testing/test_notebooks.py
index 1cc4f9da4..e0452deba 100644
--- a/testing/test_notebooks.py
+++ b/testing/test_notebooks.py
@@ -39,6 +39,9 @@
 if platform.system() == 'Windows':
    EXCLUDE_NOTEBOOKS.add('protoselect_adult_cifar10.ipynb')  # Exclude <your notebook> on Windows due to the use of wget
    EXCLUDE_NOTEBOOKS.add('similarity_explanations_20ng.ipynb')  # times out, likely due to the EmbeddingModel being slow
+   EXCLUDE_NOTEBOOKS.add('trustscore_mnist.ipynb')  # times out
+if platform.system() == 'Darwin':
+    EXCLUDE_NOTEBOOKS.add('trustscore_mnist.ipynb')  # times out
 EXECUTE_NOTEBOOKS = ALL_NOTEBOOKS - EXCLUDE_NOTEBOOKS
 
 @pytest.mark.timeout(600)