diff --git a/Lightbox/LightboxTest/packages.config b/Lightbox/LightboxTest/packages.config
index d8d3371..0f499c6 100644
--- a/Lightbox/LightboxTest/packages.config
+++ b/Lightbox/LightboxTest/packages.config
@@ -4,7 +4,7 @@
   <package id="Effort.EF6" version="1.2.0" targetFramework="net461" />
   <package id="EntityFramework" version="6.2.0" targetFramework="net461" />
   <package id="FCTB" version="2.16.24" targetFramework="net461" />
-  <package id="Google.Protobuf" version="3.6.1" targetFramework="net461" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net461" />
   <package id="log4net" version="2.0.5" targetFramework="net461" />
   <package id="Microsoft.WindowsAPICodePack-Core" version="1.1.0.2" targetFramework="net461" />
   <package id="Microsoft.WindowsAPICodePack-Shell" version="1.1.0.0" targetFramework="net461" />