diff --git a/requirements.txt b/requirements.txt
index d5e5762..316a43e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ pyOpenSSL==19.1.0
 brotli==1.0.7
 flask_pymongo==2.3.0
 flask_recaptcha==0.4.2
-protobuf==3.11.1
+protobuf==3.18.3
 importlib_metadata==1.3.0
 ipaddr==2.2.0
 keyring==20.0.0