diff --git a/samples/CSharp/WPF_D3D/IE_WPF_D3D.csproj b/samples/CSharp/WPF_D3D/IE_WPF_D3D.csproj
index 91cc3260ed..1e326d7b8b 100644
--- a/samples/CSharp/WPF_D3D/IE_WPF_D3D.csproj
+++ b/samples/CSharp/WPF_D3D/IE_WPF_D3D.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>IE_WPF_D3D</RootNamespace>
     <AssemblyName>IE_WPF_D3D</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <WarningLevel>4</WarningLevel>
diff --git a/samples/CSharp/WPF_D3D/app.config b/samples/CSharp/WPF_D3D/app.config
index e365603337..786a845b30 100644
--- a/samples/CSharp/WPF_D3D/app.config
+++ b/samples/CSharp/WPF_D3D/app.config
@@ -1,3 +1,3 @@
 <?xml version="1.0"?>
 <configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/></startup></configuration>
diff --git a/samples/CSharp/WPF_WinForms/IE_WPF_WinForms.csproj b/samples/CSharp/WPF_WinForms/IE_WPF_WinForms.csproj
index 4996b0755b..a49e95f164 100644
--- a/samples/CSharp/WPF_WinForms/IE_WPF_WinForms.csproj
+++ b/samples/CSharp/WPF_WinForms/IE_WPF_WinForms.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>IE_WPF_WinForms</RootNamespace>
     <AssemblyName>IE_WPF_WinForms</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <WarningLevel>4</WarningLevel>
diff --git a/samples/CSharp/WPF_WinForms/app.config b/samples/CSharp/WPF_WinForms/app.config
index e365603337..786a845b30 100644
--- a/samples/CSharp/WPF_WinForms/app.config
+++ b/samples/CSharp/WPF_WinForms/app.config
@@ -1,3 +1,3 @@
 <?xml version="1.0"?>
 <configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/></startup></configuration>
diff --git a/samples/CSharp/WinForms/IE_WinForms.csproj b/samples/CSharp/WinForms/IE_WinForms.csproj
index 54b7b2aa39..7d232b571a 100644
--- a/samples/CSharp/WinForms/IE_WinForms.csproj
+++ b/samples/CSharp/WinForms/IE_WinForms.csproj
@@ -27,7 +27,7 @@
     <UpgradeBackupLocation>
     </UpgradeBackupLocation>
     <OldToolsVersion>3.5</OldToolsVersion>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <TargetFrameworkProfile />
     <PublishUrl>publish\</PublishUrl>
     <Install>true</Install>
diff --git a/samples/CSharp/WinForms/app.config b/samples/CSharp/WinForms/app.config
index cb021ce515..a7c484feaa 100644
--- a/samples/CSharp/WinForms/app.config
+++ b/samples/CSharp/WinForms/app.config
@@ -35,4 +35,4 @@
       </providers>
     </roleManager>
   </system.web>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/></startup></configuration>