diff --git a/StartStopExtProgram/StartStopExtProgram.csproj b/StartStopExtProgram/StartStopExtProgram.csproj
index 12df45e..8b93739 100644
--- a/StartStopExtProgram/StartStopExtProgram.csproj
+++ b/StartStopExtProgram/StartStopExtProgram.csproj
@@ -9,7 +9,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Eugen.ESystem</RootNamespace>
     <AssemblyName>hessexpro</AssemblyName>
-    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <Deterministic>false</Deterministic>
     <TargetFrameworkProfile />
diff --git a/Test_StartStopExtProgram/App.config b/Test_StartStopExtProgram/App.config
index 5ffd8f8..de27714 100644
--- a/Test_StartStopExtProgram/App.config
+++ b/Test_StartStopExtProgram/App.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
     <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
     </startup>
 </configuration>
diff --git a/Test_StartStopExtProgram/Test_StartStopExtProgram.csproj b/Test_StartStopExtProgram/Test_StartStopExtProgram.csproj
index 7023a29..5730250 100644
--- a/Test_StartStopExtProgram/Test_StartStopExtProgram.csproj
+++ b/Test_StartStopExtProgram/Test_StartStopExtProgram.csproj
@@ -8,7 +8,7 @@
     <OutputType>WinExe</OutputType>
     <RootNamespace>Test_StartStopExtProgram</RootNamespace>
     <AssemblyName>Test_StartStopExtProgram</AssemblyName>
-    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <Deterministic>false</Deterministic>