diff --git a/src/Vulnerability.Direct.OldStyle/packages.config b/src/Vulnerability.Direct.OldStyle/packages.config
index 3047512..cff5eef 100644
--- a/src/Vulnerability.Direct.OldStyle/packages.config
+++ b/src/Vulnerability.Direct.OldStyle/packages.config
@@ -14,7 +14,7 @@
   <package id="System.Reflection.Metadata" version="1.0.21" targetFramework="net452" />
 
   <package id="Bond.Core.CSharp" version="5.3.1"  targetFramework="net452" />
-  <package id="Google.Protobuf" version="3.3.0"  targetFramework="net452" />
+  <package id="Google.Protobuf" version="3.15.0"  targetFramework="net452" />
   <package id="System.Text.RegularExpressions" version="4.0.0" targetFramework="net452" />
   <package id="System.Net.Http" version="2.0.20710" targetFramework="net452" />
 </packages>