diff --git a/requirements.txt b/requirements.txt
index 7262b5a..d5bd27c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ opencv-python==4.4.0.46
 opt-einsum==3.3.0
 pandas==1.1.5
 Pillow==8.0.1
-protobuf==3.13.0
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycodestyle==2.6.0