diff --git a/plugins/protocolbuffers/csharp/v28.3/buf.plugin.yaml b/plugins/protocolbuffers/csharp/v28.3/buf.plugin.yaml
index 80d2c1a4..1a489c73 100644
--- a/plugins/protocolbuffers/csharp/v28.3/buf.plugin.yaml
+++ b/plugins/protocolbuffers/csharp/v28.3/buf.plugin.yaml
@@ -12,7 +12,7 @@ registry:
     - base_namespace=
   nuget:
     target_frameworks:
-      - netstandard1.1
+      - netstandard2.0
     deps:
       - name: Google.Protobuf
         version: 3.28.3
diff --git a/plugins/protocolbuffers/csharp/v28.3/build.csproj b/plugins/protocolbuffers/csharp/v28.3/build.csproj
index df69d3d8..88b3e73f 100644
--- a/plugins/protocolbuffers/csharp/v28.3/build.csproj
+++ b/plugins/protocolbuffers/csharp/v28.3/build.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>netstandard1.1</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.28.3" />