diff --git a/src/core/Akka.Streams.Tests.TCK/Akka.Streams.Tests.TCK.csproj b/src/core/Akka.Streams.Tests.TCK/Akka.Streams.Tests.TCK.csproj
index b5d6a880f79..e95bbe01ab2 100644
--- a/src/core/Akka.Streams.Tests.TCK/Akka.Streams.Tests.TCK.csproj
+++ b/src/core/Akka.Streams.Tests.TCK/Akka.Streams.Tests.TCK.csproj
@@ -1,9 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\..\xunitSettings.props" />
   <PropertyGroup>
-    <!-- Reactive.Streams.TCK isn't compatible with .NET Core -->
-    <!--UNit.Framework does not yet support .NET 5 - build will fail-->
-    <TargetFrameworks>$(NetFrameworkTestVersion)</TargetFrameworks>
+    <TargetFrameworks>$(NetFrameworkTestVersion);$(NetTestVersion)</TargetFrameworks>
   </PropertyGroup>
  
   <ItemGroup>
@@ -18,7 +16,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(TestSdkVersion)" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-    <PackageReference Include="Reactive.Streams.TCK" Version="1.0.2" />
+    <PackageReference Include="Reactive.Streams.TCK" Version="1.0.4" />
     <!-- !!!WARNING!!! 
          NUNIT VERSION HAVE TO MATCH WITH THE VERSION USED BY REACTIVE TCK. 
          !!!WARNING!!! -->
diff --git a/src/core/Akka.Streams/Akka.Streams.csproj b/src/core/Akka.Streams/Akka.Streams.csproj
index d6670c863d9..7e2e59ad3f2 100644
--- a/src/core/Akka.Streams/Akka.Streams.csproj
+++ b/src/core/Akka.Streams/Akka.Streams.csproj
@@ -63,7 +63,7 @@
     </ItemGroup>
     <ItemGroup>
         <PackageReference Include="Google.Protobuf" Version="$(ProtobufVersion)" />
-        <PackageReference Include="Reactive.Streams" Version="1.0.2" />
+        <PackageReference Include="Reactive.Streams" Version="1.0.4" />
         <PackageReference Include="Grpc.Tools" Version="$(GrpcToolsVersion)">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>