diff --git a/SimApi.csproj b/SimApi.csproj
index 38f032f..2a4120d 100644
--- a/SimApi.csproj
+++ b/SimApi.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp5.0</TargetFramework>
     <OutputType>Library</OutputType>
     <PackOnBuild>true</PackOnBuild>
     <Version>0.2.3</Version>
@@ -15,6 +14,7 @@
     <SynchReleaseVersion>false</SynchReleaseVersion>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageVersion>5.0.2</PackageVersion>
+    <TargetFrameworks>net5.0;netcoreapp3.1</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(RunConfiguration)' == 'YYApi' " />