diff --git a/examples/hyperparameter/LightGBM/requirements.txt b/examples/hyperparameter/LightGBM/requirements.txt
index c8b16cefe..83d96011d 100644
--- a/examples/hyperparameter/LightGBM/requirements.txt
+++ b/examples/hyperparameter/LightGBM/requirements.txt
@@ -1,5 +1,5 @@
 pandas==1.1.2
-numpy==1.17.4
+numpy==1.21.0
 lightgbm==3.1.0
 optuna==2.7.0
 optuna-dashboard==0.4.1