diff --git a/requirements.txt b/requirements.txt
index fdb7887..f229eeb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ jdcal==1.4.1
 lazy-object-proxy==1.4.3
 mccabe==0.6.1
 paho-mqtt==1.5.0
-protobuf==3.10.0
+protobuf==3.15.0
 psutil==5.6.5
 pycodestyle==2.5.0
 pylint==2.4.4