diff --git a/functions/fetch-closed/requirements.txt b/functions/fetch-closed/requirements.txt
index 026e5ba..330dbb1 100644
--- a/functions/fetch-closed/requirements.txt
+++ b/functions/fetch-closed/requirements.txt
@@ -8,7 +8,7 @@ google-cloud-storage==1.16.1
 google-resumable-media==0.3.2
 googleapis-common-protos==1.6.0
 idna==2.8
-protobuf==3.8.0
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pytz==2019.1