diff --git a/requirements.txt b/requirements.txt
index 3a60090..19a5e76 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ passlib==1.7.1
 Paste==2.0.3
 PasteDeploy==1.5.2
 PasteScript==2.0.2
-protobuf==3.6.1
+protobuf==3.18.3
 psycopg2==2.7.5
 pyasn1==0.4.4
 pyasn1-modules==0.2.2