diff --git a/api/requirements.txt b/api/requirements.txt
index d6721e7..ffcad3c 100644
--- a/api/requirements.txt
+++ b/api/requirements.txt
@@ -67,7 +67,7 @@ pandas==0.24.2
 Pillow>=6.2.2
 pretty-midi==0.2.8
 progress==1.3
-protobuf==3.6.1
+protobuf==3.15.0
 psycopg2==2.7.6
 PuLP==1.6.10
 PyJWT==1.7.1