diff --git a/services/informant/requirements/common.txt b/services/informant/requirements/common.txt
index 342c50c..a29e117 100644
--- a/services/informant/requirements/common.txt
+++ b/services/informant/requirements/common.txt
@@ -2,7 +2,7 @@ certifi==2018.4.16
 chardet==3.0.4
 grpcio==1.12.0
 idna==2.6
-protobuf==3.15.0
+protobuf==3.18.3
 PyYAML==5.4
 requests==2.20.0
 six==1.11.0