diff --git a/Directory.Build.targets b/Directory.Build.targets
index c43425cc369..c6603ea43be 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -10,16 +10,10 @@
     <FsYaccPath>$(ArtifactsDir)/bin/fsyacc/$(Configuration)/$(FSharpNetCoreProductDefaultTargetFramework)/$(NETCoreSdkPortableRuntimeIdentifier)/fsyacc.dll</FsYaccPath>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(UnitTestType)' == 'nunit'">
-    <PackageReference Include="NUnit" Version="$(NUnitVersion)" />
-    <PackageReference Include="NUnit3TestAdapter" Version="$(NUnit3TestAdapterVersion)" />
-    <PackageReference Include="NunitXml.TestLogger" Version="$(NunitXmlTestLoggerVersion)" />
-  </ItemGroup>
-
   <ItemGroup Condition="'$(UnitTestType)' == 'xunit'">
     <PackageReference Include="xunit" Version="$(XUnitVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XUnitRunnerVersion)" />
-    <PackageReference Include="NunitXml.TestLogger" Version="$(NunitXmlTestLoggerVersion)" />
+    <PackageReference Include="XunitXml.TestLogger" Version="$(XunitXmlTestLoggerVersion)" />
   </ItemGroup>
 
   <!--
diff --git a/azure-pipelines-PR.yml b/azure-pipelines-PR.yml
index bf0339c0cc5..0c7bc9b5a17 100644
--- a/azure-pipelines-PR.yml
+++ b/azure-pipelines-PR.yml
@@ -487,7 +487,7 @@ stages:
           - task: PublishTestResults@2
             displayName: Publish Test Results
             inputs:
-              testResultsFormat: 'NUnit'
+              testResultsFormat: 'XUnit'
               testResultsFiles: '*.xml'
               searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_configuration)'
             continueOnError: true
@@ -557,7 +557,7 @@ stages:
           - task: PublishTestResults@2
             displayName: Publish Test Results
             inputs:
-              testResultsFormat: 'NUnit'
+              testResultsFormat: 'XUnit'
               testResultsFiles: '*.xml'
               searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
             continueOnError: true
@@ -600,7 +600,7 @@ stages:
           - task: PublishTestResults@2
             displayName: Publish Test Results
             inputs:
-              testResultsFormat: 'NUnit'
+              testResultsFormat: 'XUnit'
               testResultsFiles: '*.xml'
               searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
             continueOnError: true
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index b4f235359af..b49d6e126b6 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -143,7 +143,7 @@ extends:
             - task: PublishTestResults@2
               displayName: Publish Test Results
               inputs:
-                testResultsFormat: 'NUnit'
+                testResultsFormat: 'XUnit'
                 testResultsFiles: '*.xml'
                 searchFolder: '$(Build.SourcesDirectory)/artifacts/TestResults/$(_BuildConfig)'
               continueOnError: true
diff --git a/eng/Build.ps1 b/eng/Build.ps1
index 6305083d0df..08a241c0424 100644
--- a/eng/Build.ps1
+++ b/eng/Build.ps1
@@ -368,7 +368,7 @@ function TestUsingMSBuild([string] $testProject, [string] $targetFramework, [str
     $projectName = [System.IO.Path]::GetFileNameWithoutExtension($testProject)
     $testLogPath = "$ArtifactsDir\TestResults\$configuration\${projectName}_$targetFramework.xml"
     $testBinLogPath = "$LogDir\${projectName}_$targetFramework.binlog"
-    $args = "test $testProject -c $configuration -f $targetFramework -v n --test-adapter-path $testadapterpath --logger ""nunit;LogFilePath=$testLogPath"" /bl:$testBinLogPath"
+    $args = "test $testProject -c $configuration -f $targetFramework -v n --test-adapter-path $testadapterpath --logger ""xunit;LogFilePath=$testLogPath"" /bl:$testBinLogPath"
     $args += " --blame --results-directory $ArtifactsDir\TestResults\$configuration -p:vstestusemsbuildoutput=false"
 
     if (-not $noVisualStudio -or $norestore) {
@@ -383,7 +383,7 @@ function TestUsingMSBuild([string] $testProject, [string] $targetFramework, [str
         Write-Host("Starting on the background: $args")
         Write-Host("------------------------------------")
         $bgJob = Start-Job -ScriptBlock {
-            & $using:dotnetExe test $using:testProject -c $using:configuration -f $using:targetFramework -v n --test-adapter-path $using:testadapterpath --logger "nunit;LogFilePath=$using:testLogPath" /bl:$using:testBinLogPath  --blame --results-directory $using:ArtifactsDir\TestResults\$using:configuration
+            & $using:dotnetExe test $using:testProject -c $using:configuration -f $using:targetFramework -v n --test-adapter-path $using:testadapterpath --logger "xunit;LogFilePath=$using:testLogPath" /bl:$using:testBinLogPath  --blame --results-directory $using:ArtifactsDir\TestResults\$using:configuration
             if ($LASTEXITCODE -ne 0) {
                 throw "Command failed to execute with exit code $($LASTEXITCODE): $using:dotnetExe $using:args"
             }
diff --git a/eng/Versions.props b/eng/Versions.props
index 24e8f6f6790..614ced1604c 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -186,15 +186,12 @@
     <MicrosoftNETCoreILAsmVersion>5.0.0-preview.7.20364.11</MicrosoftNETCoreILAsmVersion>
     <MicrosoftNETTestSdkVersion>17.4.0</MicrosoftNETTestSdkVersion>
     <NewtonsoftJsonVersion>13.0.3</NewtonsoftJsonVersion>
-    <NUnitVersion>3.13.2</NUnitVersion>
-    <NUnit3TestAdapterVersion>4.1.0</NUnit3TestAdapterVersion>
-    <NUnitLiteVersion>3.11.0</NUnitLiteVersion>
-    <NunitXmlTestLoggerVersion>2.1.80</NunitXmlTestLoggerVersion>
     <RoslynToolsSignToolVersion>1.0.0-beta2-dev3</RoslynToolsSignToolVersion>
     <StreamJsonRpcVersion>2.18.48</StreamJsonRpcVersion>
     <NerdbankStreamsVersion>2.10.69</NerdbankStreamsVersion>
     <XUnitVersion>2.9.0</XUnitVersion>
     <XUnitRunnerVersion>2.8.2</XUnitRunnerVersion>
+    <XunitXmlTestLoggerVersion>3.1.17</XunitXmlTestLoggerVersion>
     <FluentAssertionsVersion>5.10.3</FluentAssertionsVersion>
     <HumanizerCoreVersion>2.2.0</HumanizerCoreVersion>
     <!-- -->
diff --git a/eng/build.sh b/eng/build.sh
index 90260cbfa4f..da10ebfc4f0 100755
--- a/eng/build.sh
+++ b/eng/build.sh
@@ -214,7 +214,7 @@ function Test() {
   projectname=$(basename -- "$testproject")
   projectname="${projectname%.*}"
   testlogpath="$artifacts_dir/TestResults/$configuration/${projectname}_$targetframework.xml"
-  args="test \"$testproject\" --no-restore --no-build -c $configuration -f $targetframework --test-adapter-path . --logger \"nunit;LogFilePath=$testlogpath\" --blame --results-directory $artifacts_dir/TestResults/$configuration -p:vstestusemsbuildoutput=false"
+  args="test \"$testproject\" --no-restore --no-build -c $configuration -f $targetframework --test-adapter-path . --logger \"xunit;LogFilePath=$testlogpath\" --blame --results-directory $artifacts_dir/TestResults/$configuration -p:vstestusemsbuildoutput=false"
   "$DOTNET_INSTALL_DIR/dotnet" $args || exit $?
 }
 
diff --git a/tests/EndToEndBuildTests/BasicProvider/BasicProvider.Tests/BasicProvider.Tests.fsproj b/tests/EndToEndBuildTests/BasicProvider/BasicProvider.Tests/BasicProvider.Tests.fsproj
index 98144131089..4e4aef01856 100644
--- a/tests/EndToEndBuildTests/BasicProvider/BasicProvider.Tests/BasicProvider.Tests.fsproj
+++ b/tests/EndToEndBuildTests/BasicProvider/BasicProvider.Tests/BasicProvider.Tests.fsproj
@@ -7,6 +7,7 @@
     <IsPackable>false</IsPackable>
     <DefineConstants>NO_GENERATIVE</DefineConstants>
     <FSharpCoreImplicitPackageVersion>$(FSharpCoreShippedPackageVersionValue)</FSharpCoreImplicitPackageVersion>
+    <UnitTestType>xunit</UnitTestType>
   </PropertyGroup>
 
   <ItemGroup>
@@ -21,8 +22,6 @@
     </Content>
     <PackageReference Include="BasicProvider" Version="1.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2" />
   </ItemGroup>
 
   <Target Name="RemovePackagesFromCache" BeforeTargets="Restore">
diff --git a/tests/EndToEndBuildTests/ComboProvider/ComboProvider.Tests/ComboProvider.Tests.fsproj b/tests/EndToEndBuildTests/ComboProvider/ComboProvider.Tests/ComboProvider.Tests.fsproj
index b884948e8b8..d4d410bacd4 100644
--- a/tests/EndToEndBuildTests/ComboProvider/ComboProvider.Tests/ComboProvider.Tests.fsproj
+++ b/tests/EndToEndBuildTests/ComboProvider/ComboProvider.Tests/ComboProvider.Tests.fsproj
@@ -7,6 +7,7 @@
     <IsPackable>false</IsPackable>
     <FSharpCoreImplicitPackageVersion>$(FSharpCoreShippedPackageVersionValue)</FSharpCoreImplicitPackageVersion>
     <DefineConstants>NO_GENERATIVE</DefineConstants>
+    <UnitTestType>xunit</UnitTestType>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,8 +19,6 @@
 
     <PackageReference Include="ComboProvider" Version="1.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.2" />
   </ItemGroup>
 
   <Target Name="RemovePackagesFromCache" BeforeTargets="Restore">
diff --git a/tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj b/tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj
index 93143ca4103..2ba4f6f837d 100644
--- a/tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj
+++ b/tests/FSharp.Core.UnitTests/FSharp.Core.UnitTests.fsproj
@@ -25,11 +25,6 @@
     <TailCalls>true</TailCalls>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <DefineConstants Condition="'$(UnitTestType)' == 'xunit'">$(DefineConstants);XUNIT</DefineConstants>
-    <DefineConstants Condition="'$(UnitTestType)' != 'xunit'">$(DefineConstants);NUNIT</DefineConstants>
-  </PropertyGroup>
-
   <ItemGroup>
     <Compile Include="TestFrameworkHelpers.fs" />
     <Compile Include="LibraryTestFx.fs" />