diff --git a/requirements.txt b/requirements.txt
index 64781bd..6b9fed3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ ndg-httpsclient==0.4.2
 numpy==1.11.0
 packaging==16.8
 pbr==3.0.0
-protobuf==3.1.0
+protobuf==3.15.0
 pyasn1==0.2.3
 pycparser==2.17
 pyOpenSSL==17.5.0