diff --git a/requirements.txt b/requirements.txt
index 34e30eb..72101e3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ opencv-python==4.2.0.34
 opt-einsum==3.2.1
 Pillow==7.1.2
 pkg-resources==0.0.0
-protobuf==3.12.2
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==2.4.7