diff --git a/source/examples/xgboost-randomforest-gpu-hpo-dask/notebook.ipynb b/source/examples/xgboost-randomforest-gpu-hpo-dask/notebook.ipynb
index d89889df..cd49a4c9 100644
--- a/source/examples/xgboost-randomforest-gpu-hpo-dask/notebook.ipynb
+++ b/source/examples/xgboost-randomforest-gpu-hpo-dask/notebook.ipynb
@@ -781,7 +781,6 @@
     "\n",
     "#### Further Reading\n",
     "\n",
-    "- [The 5 Classification Evaluation Metrics You Must Know](https://towardsdatascience.com/the-5-classification-evaluation-metrics-you-must-know-aa97784ff226)\n",
     "- [11 Important Model Evaluation Metrics for Machine Learning Everyone should know](https://www.analyticsvidhya.com/blog/2019/08/11-important-model-evaluation-error-metrics/)\n",
     "- [Algorithms for Hyper-Parameter Optimisation](http://papers.nips.cc/paper/4443-algorithms-for-hyper-parameter-optimization.pdf)\n",
     "- [Forward and Reverse Gradient-Based Hyperparameter Optimization](http://proceedings.mlr.press/v70/franceschi17a/franceschi17a-supp.pdf)\n",