diff --git a/.github/workflows/dotnet-core.yml b/.github/workflows/dotnet-core.yml
index 1b4dd45a0..2cf7c9339 100644
--- a/.github/workflows/dotnet-core.yml
+++ b/.github/workflows/dotnet-core.yml
@@ -17,7 +17,7 @@ jobs:
       # Turn off fail-fast to let all runners run even if there are errors
       fail-fast: true
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ ubuntu-latest ]
 
     timeout-minutes: 10
     steps:
@@ -40,7 +40,7 @@ jobs:
         
     - name: Test
       run: |
-        sed -i 's/"stopOnFail": false/"stopOnFail": true/g' UnitTests/xunit.runner.json
+        #sed -i 's/"stopOnFail": false/"stopOnFail": true/g' UnitTests/xunit.runner.json
         dotnet test --no-restore --verbosity normal 
         #--collect:"XPlat Code Coverage"  --settings UnitTests/coverlet.runsettings
         #mv -v UnitTests/TestResults/*/*.* UnitTests/TestResults/