diff --git a/dotnet/src/Microsoft.Agents.Abstractions/Microsoft.Agents.Abstractions.csproj b/dotnet/src/Microsoft.Agents.Abstractions/Microsoft.Agents.Abstractions.csproj
index 4b684d423b..b66b0fb52f 100644
--- a/dotnet/src/Microsoft.Agents.Abstractions/Microsoft.Agents.Abstractions.csproj
+++ b/dotnet/src/Microsoft.Agents.Abstractions/Microsoft.Agents.Abstractions.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
-    <TargetFramework>$(ProjectsDebugTargetFrameworks)</TargetFramework>
+    <TargetFrameworks>$(ProjectsDebugTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>
 
   <Import Project="$(RepoRoot)/dotnet/nuget/nuget-package.props" />
diff --git a/dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj b/dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj
index 993dd889cc..f127b33e61 100644
--- a/dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj
+++ b/dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
-    <TargetFramework>$(ProjectsDebugTargetFrameworks)</TargetFramework>
+    <TargetFrameworks>$(ProjectsDebugTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>
 
   <Import Project="$(RepoRoot)/dotnet/nuget/nuget-package.props" />
diff --git a/dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/Microsoft.Agents.Abstractions.UnitTests.csproj b/dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/Microsoft.Agents.Abstractions.UnitTests.csproj
index e7f7c13861..02023b3bce 100644
--- a/dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/Microsoft.Agents.Abstractions.UnitTests.csproj
+++ b/dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/Microsoft.Agents.Abstractions.UnitTests.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
-    <TargetFramework>$(ProjectsDebugTargetFrameworks)</TargetFramework>
+    <TargetFrameworks>$(ProjectsDebugTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/dotnet/tests/Microsoft.Agents.UnitTests/Microsoft.Agents.UnitTests.csproj b/dotnet/tests/Microsoft.Agents.UnitTests/Microsoft.Agents.UnitTests.csproj
index 6ca2dca2fd..cdfe20b4d3 100644
--- a/dotnet/tests/Microsoft.Agents.UnitTests/Microsoft.Agents.UnitTests.csproj
+++ b/dotnet/tests/Microsoft.Agents.UnitTests/Microsoft.Agents.UnitTests.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
-    <TargetFramework>$(ProjectsDebugTargetFrameworks)</TargetFramework>
+    <TargetFrameworks>$(ProjectsDebugTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>