diff --git a/.travis.yml b/.travis.yml
index 37ca3f8f7..e9171c2e2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,6 @@ script:
   - msbuild /t:Restore $TRAVIS_BUILD_DIR/Terminal.sln
   - cd $TRAVIS_BUILD_DIR/
   - msbuild /p:Configuration=Release Terminal.sln
-mono: "5.20.1"
-dotnet: "2.1.4"
+mono: "6.8.0"
+dotnet: "3.1.201"
 os: "osx"
diff --git a/Terminal.Gui/Terminal.Gui.csproj b/Terminal.Gui/Terminal.Gui.csproj
index 2f42588eb..fa2ce8b07 100644
--- a/Terminal.Gui/Terminal.Gui.csproj
+++ b/Terminal.Gui/Terminal.Gui.csproj
@@ -59,10 +59,7 @@
   <ItemGroup>
     <PackageReference Include="NStack.Core" Version="0.11.0" />
     <PackageReference Include="System.ValueTuple" Version="4.4.0" />
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
-    </PackageReference>
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" />
   </ItemGroup>
   <ItemGroup>
   </ItemGroup>