diff --git a/CVC-YOLOv3/requirements.txt b/CVC-YOLOv3/requirements.txt
index 764c988..e903d34 100644
--- a/CVC-YOLOv3/requirements.txt
+++ b/CVC-YOLOv3/requirements.txt
@@ -9,7 +9,7 @@ imgaug==0.3.0
 onnx==1.6.0
 optuna==0.19.0
 Pillow==6.2.1
-protobuf==3.11.0
+protobuf==3.18.3
 pymysql==0.9.3
 retrying==1.3.3
 tensorboardX==1.9