diff --git a/src/Moq.Tests.Issue1648Harness/Issue1648Harness.csproj b/src/Moq.Tests.Issue1648Harness/Issue1648Harness.csproj
index f7f1840ca..e0820f99a 100644
--- a/src/Moq.Tests.Issue1648Harness/Issue1648Harness.csproj
+++ b/src/Moq.Tests.Issue1648Harness/Issue1648Harness.csproj
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" PrivateAssets="All" ExcludeAssets="all" GeneratePathProperty="true" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" PrivateAssets="All" ExcludeAssets="all" GeneratePathProperty="true" />
     <!-- Force exact 4.5.4 net461 copy for genuine conflict sim (asm ver 4.2.0.1).
          This is the 'older' version preloaded to trigger the original FileLoad scenario against Moq's 4.6.3 ref.
          Uses the package-specific path property (guaranteed to be present after restore) instead of $(NuGetPackageRoot). -->