diff --git a/requirements.txt b/requirements.txt
index a6828ca..46a2985 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 cbor2==5.0.1
 requests==2.22.0
-protobuf==3.11.3
+protobuf==3.15.0
 grpcio==1.26.0