diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d5fe15c0..8d5a74e6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,7 +33,7 @@ jobs:
         uses: actions/setup-dotnet@v1
         with:
           # As usual, obtained from: https://dotnetcli.blob.core.windows.net/dotnet/release-metadata/5.0/releases.json
-          dotnet-version: "3.1.404" # since we now use this
+          dotnet-version: "3.1.409" # since we now use this
       - name: Clear Nuget Cache
         run: dotnet nuget locals all --clear
       - name: Restore
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 868aaeab..c908588e 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -30,7 +30,7 @@ jobs:
         uses: actions/setup-dotnet@v1
         with:
           # As usual, obtained from: https://dotnetcli.blob.core.windows.net/dotnet/release-metadata/5.0/releases.json
-          dotnet-version: "3.1.404" # since we now use this
+          dotnet-version: "3.1.409" # since we now use this
       - name: Clear Nuget Cache
         run: dotnet nuget locals all --clear
       - name: Nuget Restore
diff --git a/Common.props b/Common.props
index c3f703e4..d76b2ec5 100644
--- a/Common.props
+++ b/Common.props
@@ -11,5 +11,9 @@
     <AnalysisMode>AllEnabledByDefault</AnalysisMode>
     <AnalysisLevel>latest</AnalysisLevel>
   </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.2" />
+  </ItemGroup>
   
 </Project>
\ No newline at end of file