diff --git a/TrunkedPrototypes/TrunkedPrototypes/packages.config b/TrunkedPrototypes/TrunkedPrototypes/packages.config
index f9c6e7a..85de862 100644
--- a/TrunkedPrototypes/TrunkedPrototypes/packages.config
+++ b/TrunkedPrototypes/TrunkedPrototypes/packages.config
@@ -12,7 +12,7 @@
   <package id="Google.Apis.Core" version="1.35.1" targetFramework="net461" />
   <package id="Google.Cloud.Vision.V1" version="1.3.0-beta01" targetFramework="net461" />
   <package id="Google.LongRunning" version="1.0.0" targetFramework="net461" />
-  <package id="Google.Protobuf" version="3.5.1" targetFramework="net461" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net461" />
   <package id="Grpc.Auth" version="1.13.1" targetFramework="net461" />
   <package id="Grpc.Core" version="1.13.1" targetFramework="net461" />
   <package id="jQuery" version="3.3.1" targetFramework="net461" />