diff --git a/src/NSubstitute/NSubstitute.csproj b/src/NSubstitute/NSubstitute.csproj
index 20db4d49..e683edf3 100644
--- a/src/NSubstitute/NSubstitute.csproj
+++ b/src/NSubstitute/NSubstitute.csproj
@@ -54,7 +54,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
   </ItemGroup>
 
 </Project>