diff --git a/requirements.txt b/requirements.txt
index f1389cc..1631780 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ Markdown==3.1.1
 numpy==1.17.2
 opencv-contrib-python==4.1.1.26
 Pillow==6.2.0
-protobuf==3.9.2
+protobuf==3.18.3
 scikit-learn==0.21.3
 scipy==1.3.1
 six==1.12.0