diff --git a/requirements.txt b/requirements.txt
index 14ce062..e725004 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ paho-mqtt==1.4.0
 colorlog==4.0.2
 tornado==5.1.1
 typing>=3.6.6;python_version<"3.5"
-protobuf==3.10.0
+protobuf==3.18.3
 tzlocal==2.0.0
 pytz==2019.3
 pyserial==3.4
diff --git a/requirements_test.txt b/requirements_test.txt
index 26f1443..1e466ae 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -4,7 +4,7 @@ paho-mqtt==1.4.0
 colorlog==4.0.2
 tornado==5.1.1
 typing>=3.6.6;python_version<"3.5"
-protobuf==3.10.0
+protobuf==3.18.3
 tzlocal==2.0.0
 pytz==2019.3
 pyserial==3.4