diff --git a/AsyncLock/AsyncLock.csproj b/AsyncLock/AsyncLock.csproj
index 66bc0f2..66c7bfd 100644
--- a/AsyncLock/AsyncLock.csproj
+++ b/AsyncLock/AsyncLock.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.3;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;net8.0;net9.0</TargetFrameworks>
     <RootNamespace>NeoSmart.AsyncLock</RootNamespace>
     <PackageId>NeoSmart.AsyncLock</PackageId>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
diff --git a/UnitTests/UnitTests.csproj b/UnitTests/UnitTests.csproj
index 45508e9..39b4414 100644
--- a/UnitTests/UnitTests.csproj
+++ b/UnitTests/UnitTests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
 
@@ -9,10 +9,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
-    <PackageReference Include="coverlet.collector" Version="1.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4" />
   </ItemGroup>
 
   <ItemGroup>