diff --git a/requirements.txt b/requirements.txt
index 59e19ca..ee332cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ jws==0.1.3
 oauth2client==3.0.0
 pathlib2==2.3.5
 Pillow==7.0.0
-protobuf==3.11.3
+protobuf==3.18.3
 psycopg2==2.8.4
 psycopg2-binary==2.8.4
 pyasn1==0.4.8