diff --git a/design/langsDesign/packages.config b/design/langsDesign/packages.config
index 9694122c..5946e644 100644
--- a/design/langsDesign/packages.config
+++ b/design/langsDesign/packages.config
@@ -3,7 +3,7 @@
   <package id="Common.Logging" version="3.4.1" targetFramework="net472" />
   <package id="Common.Logging.Core" version="3.4.1" targetFramework="net472" />
   <package id="CoreCLR-NCalc" version="2.2.70" targetFramework="net472" />
-  <package id="Google.Protobuf" version="3.11.4" targetFramework="net472" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net472" />
   <package id="Microsoft.CSharp" version="4.7.0" targetFramework="net472" />
   <package id="Sepia.Globalization" version="0.8.0" targetFramework="net472" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net472" />