diff --git a/Flow.Launcher.Plugin/Flow.Launcher.Plugin.csproj b/Flow.Launcher.Plugin/Flow.Launcher.Plugin.csproj
index 3d338d8b1..f86e0799c 100644
--- a/Flow.Launcher.Plugin/Flow.Launcher.Plugin.csproj
+++ b/Flow.Launcher.Plugin/Flow.Launcher.Plugin.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0-windows</TargetFramework>
+    <TargetFrameworks>net6.0-windows;net5.0-windows</TargetFrameworks>
     <ProjectGuid>{8451ECDD-2EA4-4966-BB0A-7BBC40138E80}</ProjectGuid>
     <UseWPF>true</UseWPF>
     <OutputType>Library</OutputType>
diff --git a/Flow.Launcher.Test/Plugins/JsonRPCPluginTest.cs b/Flow.Launcher.Test/Plugins/JsonRPCPluginTest.cs
index 383650619..7231dfbe0 100644
--- a/Flow.Launcher.Test/Plugins/JsonRPCPluginTest.cs
+++ b/Flow.Launcher.Test/Plugins/JsonRPCPluginTest.cs
@@ -76,7 +76,7 @@ namespace Flow.Launcher.Test.Plugins
         [TestCaseSource(typeof(JsonRPCPluginTest), nameof(ResponseModelsSource))]
         public async Task GivenModel_WhenSerializeWithDifferentNamingPolicy_ThenExpectSameResult_Async(JsonRPCQueryResponseModel reference)
         {
-            var camelText = JsonSerializer.Serialize(reference, new() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
+            var camelText = JsonSerializer.Serialize(reference, new JsonSerializerOptions() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
 
             var pascalText = JsonSerializer.Serialize(reference);