diff --git a/lectures/4_segmentation.ipynb b/lectures/4_segmentation.ipynb
index 4eefa4a..54f3150 100644
--- a/lectures/4_segmentation.ipynb
+++ b/lectures/4_segmentation.ipynb
@@ -338,7 +338,7 @@
     "indices = draw.circle_perimeter(100, 220, 25)\n",
     "\n",
     "astronaut_labels[indices] = 1\n",
-    "astronaut_labels[points[:, 1].astype(np.int), points[:, 0].astype(np.int)] = 2\n",
+    "astronaut_labels[points[:, 1].astype(int), points[:, 0].astype(int)] = 2\n",
     "\n",
     "image_show(astronaut_labels);"
    ]