diff --git a/requirements.txt b/requirements.txt
index 098513f..f1a15bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ Paste==2.0.2
 PasteDeploy==2.0.1
 plaster==1.0
 plaster-pastedeploy==0.7
-protobuf==3.7.1
+protobuf==3.18.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.4
 PyBrowserID==0.9.2