diff --git a/requirements.txt b/requirements.txt
index 2e4e0d6..1167304 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ pandas==0.20.3
 pbr==3.1.1
 Pillow==4.2.1
 ply==3.10
-protobuf==3.3.0
+protobuf==3.15.0
 pyexcel==0.5.6
 pyexcel-io==0.5.5
 pyexcel-xls==0.5.5