diff --git a/src/emailservice/requirements.txt b/src/emailservice/requirements.txt
index 6b103f9..e92f63d 100644
--- a/src/emailservice/requirements.txt
+++ b/src/emailservice/requirements.txt
@@ -17,7 +17,7 @@ keyring==10.1
 keyrings.alt==1.3
 MarkupSafe==1.0
 opencensus==0.1.5
-protobuf==3.6.0
+protobuf==3.18.3
 pyasn1==0.4.3
 pyasn1-modules==0.2.2
 pygobject==3.22.0