diff --git a/sandbox/PerformanceComparison/packages.config b/sandbox/PerformanceComparison/packages.config
index 67e07ae..67347a2 100644
--- a/sandbox/PerformanceComparison/packages.config
+++ b/sandbox/PerformanceComparison/packages.config
@@ -4,7 +4,7 @@
   <package id="FsPickler" version="3.2.0" targetFramework="net461" />
   <package id="FsPickler.CSharp" version="3.2.0" targetFramework="net461" />
   <package id="FsPickler.Json" version="3.2.0" targetFramework="net461" />
-  <package id="Google.Protobuf" version="3.2.0" targetFramework="net461" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net461" />
   <package id="Jil" version="2.15.0" targetFramework="net461" />
   <package id="MessagePack" version="0.8.2" targetFramework="net461" />
   <package id="MsgPack.Cli" version="0.9.0-beta2" targetFramework="net461" />