diff --git a/src/answers/Q_72193393/requirements.txt b/src/answers/Q_72193393/requirements.txt
index 0daa28d..87a8509 100644
--- a/src/answers/Q_72193393/requirements.txt
+++ b/src/answers/Q_72193393/requirements.txt
@@ -1,5 +1,5 @@
 numpy
 pandas
 kaleido
-optuna
+optuna==4.2.1
 tqdm