diff --git a/master/requirements.txt b/master/requirements.txt
index 5ca388e..657c5c1 100644
--- a/master/requirements.txt
+++ b/master/requirements.txt
@@ -61,7 +61,7 @@ pipenv==8.3.1
 plac==0.9.6
 pluggy==0.6.0
 preshed==1.0.0
-protobuf==3.5.2.post1
+protobuf==3.18.3
 psycopg2==2.7.4
 py==1.5.3
 pyasn1==0.4.3