diff --git a/03_classification.ipynb b/03_classification.ipynb
index 7c66716..284d0a6 100644
--- a/03_classification.ipynb
+++ b/03_classification.ipynb
@@ -948,7 +948,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "y_train_knn_pred = cross_val_predict(knn_clf, X_train, y_multilabel, cv=3)\n",
+    "y_train_knn_pred = cross_val_predict(knn_clf, X_train, y_multilabel, cv=3, n_jobs=-1)\n",
     "f1_score(y_multilabel, y_train_knn_pred, average=\"macro\")"
    ]
   },