diff --git a/src60/TimeZoneConverter/TimeZoneConverter.csproj b/src60/TimeZoneConverter/TimeZoneConverter.csproj
index 9ef39b4..69ff977 100644
--- a/src60/TimeZoneConverter/TimeZoneConverter.csproj
+++ b/src60/TimeZoneConverter/TimeZoneConverter.csproj
@@ -10,7 +10,7 @@
     <PackageReference Include="CoreWCF.Primitives" Version="1.8.1" />
     <PackageReference Include="Microsoft.AspNetCore" Version="2.3.0" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.3.10" />
-    <PackageReference Include="Microsoft.AspNetCore.Authentication.Negotiate" Version="9.0.11" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.Negotiate" Version="9.0.18" />
     <PackageReference Include="System.ServiceModel.Primitives" Version="8.1.2" />
   </ItemGroup>
   <ItemGroup>