diff --git a/WindowsService_test/packages.config b/WindowsService_test/packages.config
index fb182e6..e84a2a9 100644
--- a/WindowsService_test/packages.config
+++ b/WindowsService_test/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="BouncyCastle" version="1.8.3.1" targetFramework="net452" />
-  <package id="Google.Protobuf" version="3.6.1" targetFramework="net452" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net452" />
   <package id="K4os.Compression.LZ4" version="1.1.11" targetFramework="net452" />
   <package id="K4os.Compression.LZ4.Streams" version="1.1.11" targetFramework="net452" />
   <package id="K4os.Hash.xxHash" version="1.0.6" targetFramework="net452" />