diff --git a/02_Windows_App/Perun_v1/packages.config b/02_Windows_App/Perun_v1/packages.config
index 28d5c7a..5d64e70 100644
--- a/02_Windows_App/Perun_v1/packages.config
+++ b/02_Windows_App/Perun_v1/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.8.3.1" targetFramework="net48" />
-  <package id="Google.Protobuf" version="3.6.1" targetFramework="net48" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net48" />
   <package id="MySql.Data" version="8.0.17" targetFramework="net48" />
   <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net48" />
   <package id="SSH.NET" version="2020.0.2" targetFramework="net48" />