diff --git a/requirements.txt b/requirements.txt
index d8a9ee4..a2dba1f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ MarkupSafe==1.1.0
 more-itertools==5.0.0
 msgpack==0.6.1
 pluggy==0.8.1
-protobuf==3.6.1
+protobuf==3.15.0
 psycopg2==2.7.7
 psycopg2-binary==2.7.7
 py==1.7.0