diff --git a/backend/requirements.txt b/backend/requirements.txt
index 58dd84e..7070d4e 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -30,7 +30,7 @@ google-cloud-pubsub==1.1.0
 google-resumable-media==0.4.1
 googleapis-common-protos==1.6.0
 idna==2.8
-protobuf==3.10.0
+protobuf==3.18.3
 pyasn1==0.4.7
 pyasn1-modules==0.2.7
 pytz==2019.3