diff --git a/ln.threading.csproj b/ln.threading.csproj
index 95f7079..6185cca 100644
--- a/ln.threading.csproj
+++ b/ln.threading.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>