diff --git a/GarminLumoDownloader/requirements.txt b/GarminLumoDownloader/requirements.txt
index 645cd07..119de85 100644
--- a/GarminLumoDownloader/requirements.txt
+++ b/GarminLumoDownloader/requirements.txt
@@ -59,7 +59,7 @@ pickleshare==0.7.4
 Pillow==5.0.0
 pluggy==0.6.0
 prompt-toolkit==1.0.15
-protobuf==3.5.1
+protobuf==3.18.3
 psutil==5.4.3
 py==1.5.2
 pycodestyle==2.3.1