diff --git a/requirements.txt b/requirements.txt
index bdf9ec4..562af5b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ msgpack==1.0.0
 numpy==1.18.2
 oauth2client==4.1.2
 Pillow==7.1.1
-protobuf==3.9.1
+protobuf==3.18.3
 pyasn1==0.4.7
 pyasn1-modules==0.2.6
 pycryptodome==3.9.7