diff --git a/requirements.txt b/requirements.txt
index 557ed45..d0baeb7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ msgpack==0.5.6
 networkx==2.2
 numpy==1.14.3
 Pillow==5.0.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyasn1==0.4.4
 pyasn1-modules==0.2.2
 pycodestyle==2.4.0