diff --git a/notebooks/Block_5/Jupyter Notebook Block 5 - Object Detection and Segmentation.ipynb b/notebooks/Block_5/Jupyter Notebook Block 5 - Object Detection and Segmentation.ipynb
index 37a8e6f0d523df55c0def26e5eb8557827025c78..31fa8670b296d6285b139776b1fb72970fd7e5bc 100644
--- a/notebooks/Block_5/Jupyter Notebook Block 5 - Object Detection and Segmentation.ipynb	
+++ b/notebooks/Block_5/Jupyter Notebook Block 5 - Object Detection and Segmentation.ipynb	
@@ -656,7 +656,7 @@
     "    \n",
     "# The target image size can be fixed here (quadratic)\n",
     "# The ImageDataGenerator() automatically scales the images accordingly (aspect ratio is changed)\n",
-    "image_size = 180"
+    "image_size = 150"
    ]
   },
   {