diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0d0bbd107..d1edd38d2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -75,7 +75,7 @@ jobs:
       - name: Setup Additional Languages (.Net)
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '5'
+          dotnet-version: '6'
 
       # - name: Setup Additional Languages (golang)
       #   uses: actions/setup-go@v3
diff --git a/serde-generate/runtime/csharp/Serde.Tests/Serde.Tests.csproj b/serde-generate/runtime/csharp/Serde.Tests/Serde.Tests.csproj
index d17c9cbdb..3f55b4e8c 100644
--- a/serde-generate/runtime/csharp/Serde.Tests/Serde.Tests.csproj
+++ b/serde-generate/runtime/csharp/Serde.Tests/Serde.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net5</TargetFrameworks>
+    <TargetFrameworks>net6</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <LangVersion>7.2</LangVersion>
   </PropertyGroup>
diff --git a/serde-generate/tests/csharp_runtime.rs b/serde-generate/tests/csharp_runtime.rs
index 2449ff7d1..36eaf8266 100644
--- a/serde-generate/tests/csharp_runtime.rs
+++ b/serde-generate/tests/csharp_runtime.rs
@@ -83,7 +83,7 @@ fn make_test_project(
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net5</TargetFrameworks>
+    <TargetFrameworks>net6</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <LangVersion>7.2</LangVersion>
   </PropertyGroup>