diff --git a/requirements.txt b/requirements.txt
index a1f0abc..345fb07 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ numpy==1.13.3
 pandas==0.22.0
 pbr==3.1.1
 pipdeptree==0.10.1
-protobuf==3.4.0
+protobuf==3.15.0
 py==1.4.34
 pycodestyle==2.3.1
 pyflakes==1.5.0