diff --git a/requirements.txt b/requirements.txt
index 815e13cf..9c2eb7d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ MarkupSafe==1.0
 mccabe==0.6.1
 openapi-codec==1.3.2
 ply==3.8
-protobuf==3.5.1
+protobuf==3.15.0
 psycopg2==2.7.3.2
 pyasn1==0.4.2
 pyasn1-modules==0.2.1