diff --git a/src/Standart.Hash.xxHash/Standart.Hash.xxHash.csproj b/src/Standart.Hash.xxHash/Standart.Hash.xxHash.csproj
index 0715c41..fd6e319 100644
--- a/src/Standart.Hash.xxHash/Standart.Hash.xxHash.csproj
+++ b/src/Standart.Hash.xxHash/Standart.Hash.xxHash.csproj
@@ -1,15 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
   
-  <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-  </PropertyGroup>
-  
   <Import Project="..\..\nuget.props" />
   
-  <ItemGroup>
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0; netstandard2.1; netcoreapp3.1; net48;</TargetFrameworks>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  
+  <ItemGroup Condition="$(TargetFramework) == 'netstandard2.0' OR $(TargetFramework) == 'net48'">
     <PackageReference Include="System.Buffers" Version="$(SystemBuffers)" />
-	  <PackageReference Include="System.IO" Version="$(SystemIO)" />
     <PackageReference Include="System.Memory" Version="$(SystemMemory)" />
 	  <PackageReference Include="System.Threading.Tasks.Extensions" Version="$(SystemTasks)" />
   </ItemGroup>