diff --git a/Directory.Packages.props b/Directory.Packages.props
new file mode 100644
index 0000000..a10ed18
--- /dev/null
+++ b/Directory.Packages.props
@@ -0,0 +1,8 @@
+<Project>
+    <PropertyGroup>
+        <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    </PropertyGroup>
+    <ItemGroup>
+        <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />
+    </ItemGroup>
+</Project>
diff --git a/src/Tribufu.Sdk/Tribufu.Sdk.csproj b/src/Tribufu.Sdk/Tribufu.Sdk.csproj
index c3a4788..7ccc69b 100644
--- a/src/Tribufu.Sdk/Tribufu.Sdk.csproj
+++ b/src/Tribufu.Sdk/Tribufu.Sdk.csproj
@@ -14,7 +14,7 @@
     <PropertyGroup>
         <OutputType>Library</OutputType>
         <AppDesignerFolder>Properties</AppDesignerFolder>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFrameworks>netstandard2.0;net45;net5.0</TargetFrameworks>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     </PropertyGroup>
     <ItemGroup>
diff --git a/src/Tribufu.Serialization.Newtonsoft/Tribufu.Serialization.Newtonsoft.csproj b/src/Tribufu.Serialization.Newtonsoft/Tribufu.Serialization.Newtonsoft.csproj
index 7788afd..2aade60 100644
--- a/src/Tribufu.Serialization.Newtonsoft/Tribufu.Serialization.Newtonsoft.csproj
+++ b/src/Tribufu.Serialization.Newtonsoft/Tribufu.Serialization.Newtonsoft.csproj
@@ -14,11 +14,11 @@
     <PropertyGroup>
         <OutputType>Library</OutputType>
         <AppDesignerFolder>Properties</AppDesignerFolder>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFrameworks>netstandard2.0;net45;net5.0</TargetFrameworks>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     </PropertyGroup>
     <ItemGroup>
-        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+        <PackageReference Include="Newtonsoft.Json" />
     </ItemGroup>
     <ItemGroup>
         <None Include="README.md" Pack="true" PackagePath="\" />
diff --git a/src/Tribufu.Serialization/Tribufu.Serialization.csproj b/src/Tribufu.Serialization/Tribufu.Serialization.csproj
index a60bf61..b93b947 100644
--- a/src/Tribufu.Serialization/Tribufu.Serialization.csproj
+++ b/src/Tribufu.Serialization/Tribufu.Serialization.csproj
@@ -14,7 +14,7 @@
     <PropertyGroup>
         <OutputType>Library</OutputType>
         <AppDesignerFolder>Properties</AppDesignerFolder>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFrameworks>net5.0</TargetFrameworks>
         <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     </PropertyGroup>
     <ItemGroup>