diff --git a/build/build.nuspec b/build/build.nuspec
index 92569a32..a9024097 100644
--- a/build/build.nuspec
+++ b/build/build.nuspec
@@ -27,6 +27,7 @@
       <group targetFramework=".NETFramework4.7.1" />
       <group targetFramework=".NETFramework4.7.2" />
       <group targetFramework=".NETFramework4.8" />
+      <group targetFramework=".NETFramework4.8.1" />
       <group targetFramework=".NETCoreApp3.0" />
       <group targetFramework=".NETCoreApp3.1" />
       <group targetFramework="net5.0" />
@@ -71,17 +72,14 @@
     <file src="lib\net481\HandyControl.dll" target="lib\net481\HandyControl.dll" />
     <file src="lib\net481\HandyControl.pdb" target="lib\net481\HandyControl.pdb" />
     <file src="lib\net481\HandyControl.xml" target="lib\net481\HandyControl.xml" />
-    <file src="lib\net5.0\ref\HandyControl.dll" target="lib\net5.0\ref\HandyControl.dll" />
     <file src="lib\net5.0\HandyControl.deps.json" target="lib\net5.0\HandyControl.deps.json" />
     <file src="lib\net5.0\HandyControl.dll" target="lib\net5.0\HandyControl.dll" />
     <file src="lib\net5.0\HandyControl.pdb" target="lib\net5.0\HandyControl.pdb" />
     <file src="lib\net5.0\HandyControl.xml" target="lib\net5.0\HandyControl.xml" />
-    <file src="lib\net6.0\ref\HandyControl.dll" target="lib\net6.0\ref\HandyControl.dll" />
     <file src="lib\net6.0\HandyControl.deps.json" target="lib\net6.0\HandyControl.deps.json" />
     <file src="lib\net6.0\HandyControl.dll" target="lib\net6.0\HandyControl.dll" />
     <file src="lib\net6.0\HandyControl.pdb" target="lib\net6.0\HandyControl.pdb" />
     <file src="lib\net6.0\HandyControl.xml" target="lib\net6.0\HandyControl.xml" />
-    <file src="lib\net7.0\ref\HandyControl.dll" target="lib\net7.0\ref\HandyControl.dll" />
     <file src="lib\net7.0\HandyControl.deps.json" target="lib\net7.0\HandyControl.deps.json" />
     <file src="lib\net7.0\HandyControl.dll" target="lib\net7.0\HandyControl.dll" />
     <file src="lib\net7.0\HandyControl.pdb" target="lib\net7.0\HandyControl.pdb" />