diff --git a/requirements.txt b/requirements.txt
index ac60a84..aa5633d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ opencv-python-headless==4.1.1.26
 optuna==0.17.1
 pandas==0.25.1
 Pillow==6.2.0
-protobuf==3.10.0
+protobuf==3.18.3
 scikit-learn==0.21.3
 scipy==1.3.1
 six==1.12.0