diff --git a/.github/workflows/dotnetcore.yml b/.github/workflows/dotnetcore.yml
index 8edab4d1..1e5a1c7a 100644
--- a/.github/workflows/dotnetcore.yml
+++ b/.github/workflows/dotnetcore.yml
@@ -12,8 +12,10 @@ on:
 jobs:
   build:
 
-    runs-on: windows-2019
-
+    runs-on: ${{ matrix.os }}
+    strategy:
+        matrix:
+          os: [ubuntu-latest, windows-latest]
     steps:
     - uses: actions/checkout@v2
     - name: Setup .NET Core
@@ -26,10 +28,12 @@ jobs:
       run: dotnet test -c Debug  #uses msbuild.rsp for coverlet configuration
     - name: coveralls
       uses: coverallsapp/github-action@v1.1.1
+      if: matrix.os == 'windows-latest'
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }} 
         path-to-lcov: ./ParserTests/lcov.info 
     - name: push
+      if: matrix.os == 'windows-latest'
       id: publish_nuget
       uses: brandedoutcast/publish-nuget@v2.5.2
       with:
@@ -38,7 +42,7 @@ jobs:
           NUGET_KEY: ${{ secrets.NUGET_KEY }}
           VERSION_FILE_PATH: sly/sly.csproj
     - name: Create Release
-      if: ${{ success() && steps.publish_nuget.outputs.VERSION != ''  && steps.publish_nuget.outputs.VERSION != null }}
+      if: ${{ success() && matrix.os == 'windows-latest' && steps.publish_nuget.outputs.VERSION != ''  && steps.publish_nuget.outputs.VERSION != null }}
       id: create_release
       uses: actions/create-release@latest
       env:
@@ -49,7 +53,7 @@ jobs:
         draft: false
         prerelease: false
     - name: Upload Release Asset
-      if: ${{ success() && steps.create_release.outputs.upload_url != ''  && steps.create_release.outputs.upload_url != null }}
+      if: ${{ success() && matrix.os == 'windows-latest' && steps.create_release.outputs.upload_url != ''  && steps.create_release.outputs.upload_url != null }}
       id: upload-release-asset 
       uses: actions/upload-release-asset@v1
       env:
diff --git a/samples/ParserExample/Issue183Lexer.cs b/samples/ParserExample/Issue183Lexer.cs
deleted file mode 100644
index 797f735d..00000000
--- a/samples/ParserExample/Issue183Lexer.cs
+++ /dev/null
@@ -1,50 +0,0 @@
-using sly.lexer;
-
-namespace ParserExample
-{
-    public enum Issue165Lexer
-    {
-        [Lexeme(GenericToken.SugarToken,"?")]
-        QUESTIONMARK = 1,
-        
-        [Lexeme(GenericToken.SugarToken,"+")]
-        PLUS = 2,
-        
-        [Lexeme(GenericToken.SugarToken,"-")]
-        MINUS = 3,
-        
-        [Lexeme(GenericToken.SugarToken,"*")]
-        TIMES = 4,
-        
-        [Lexeme(GenericToken.SugarToken,"/")]
-        DIVIDE = 5,
-        
-        [Lexeme(GenericToken.SugarToken,"(")]
-        LPAR = 6,
-        
-        [Lexeme(GenericToken.SugarToken,")")]
-        RPAR = 6,
-        
-        [Lexeme(GenericToken.SugarToken,"[")]
-        LBR = 7,
-        
-        [Lexeme(GenericToken.SugarToken,"]")]
-        RBR = 8,
-        
-        [Lexeme(GenericToken.SugarToken,":")]
-        COLON = 7,
-        
-        [Lexeme(GenericToken.SugarToken,"=")]
-        EQ = 8,
-        
-        
-        [Lexeme(GenericToken.Identifier)] ID = 20,
-
-        [Lexeme(GenericToken.String)] STRING = 21,
-
-        [Lexeme(GenericToken.Int)] INT = 22,
-        
-        
-        
-    }
-}
\ No newline at end of file
diff --git a/samples/ParserExample/ParserExample.csproj b/samples/ParserExample/ParserExample.csproj
index 9f8dc89d..ebcbd018 100644
--- a/samples/ParserExample/ParserExample.csproj
+++ b/samples/ParserExample/ParserExample.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
 	<Authors>b3b00</Authors>
   </PropertyGroup>