diff --git a/Tools/DeclarationCycleZip/DeclarationCycleZip.csproj b/Tools/DeclarationCycleZip/DeclarationCycleZip.csproj
index 7426ce847c7e001cb3da56e82a9a73293b69b435..fcef676f339aef78819dcf2a0f0a61305c78a88c 100644
--- a/Tools/DeclarationCycleZip/DeclarationCycleZip.csproj
+++ b/Tools/DeclarationCycleZip/DeclarationCycleZip.csproj
@@ -3,7 +3,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>DeclarationCycleZip</RootNamespace>
     <AssemblyName>DeclarationCycleZip</AssemblyName>
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFrameworks>net5.0</TargetFrameworks>
     <DefineConstants />
   </PropertyGroup>
 
diff --git a/Tools/GraphDrawer/GraphDrawer.csproj b/Tools/GraphDrawer/GraphDrawer.csproj
index fedd980a65886e9f4df4de0c3dce29bc8467ec3d..e26fef0a461607748f47be4df98184b65178c292 100644
--- a/Tools/GraphDrawer/GraphDrawer.csproj
+++ b/Tools/GraphDrawer/GraphDrawer.csproj
@@ -3,7 +3,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>GraphDrawer</RootNamespace>
     <AssemblyName>GraphDrawer</AssemblyName>
-    <TargetFrameworks>net6.0-windows</TargetFrameworks>
+    <TargetFrameworks>net5.0-windows</TargetFrameworks>
     <DefineConstants />
   </PropertyGroup>
 
diff --git a/Tools/LicenceHeader/LicenceHeader.csproj b/Tools/LicenceHeader/LicenceHeader.csproj
index 832dd4037d1ee0285597297ff630353f748a7c8f..daf6950908b73103d7f79dd9511f5a551e3313ab 100644
--- a/Tools/LicenceHeader/LicenceHeader.csproj
+++ b/Tools/LicenceHeader/LicenceHeader.csproj
@@ -3,7 +3,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>LicenceHeader</RootNamespace>
     <AssemblyName>LicenceHeader</AssemblyName>
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFrameworks>net5.0</TargetFrameworks>
     <DefineConstants />
   </PropertyGroup>
   <ItemGroup>
diff --git a/VECTOAux/VectoAuxiliariesTests/VectoAuxiliariesTests.vbproj b/VECTOAux/VectoAuxiliariesTests/VectoAuxiliariesTests.vbproj
index 709802e110259afb2ea612c12eeab84f033a3b2e..28d399122f5e3c47736429da2b291d609a39c775 100644
--- a/VECTOAux/VectoAuxiliariesTests/VectoAuxiliariesTests.vbproj
+++ b/VECTOAux/VectoAuxiliariesTests/VectoAuxiliariesTests.vbproj
@@ -7,7 +7,7 @@
     <OptionCompare>Binary</OptionCompare>
     <OptionStrict>On</OptionStrict>
     <OptionInfer>On</OptionInfer>
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFrameworks>net5.0</TargetFrameworks>
     <DefineConstants />
   </PropertyGroup>
 
diff --git a/VectoConsole/VectoConsole.csproj b/VectoConsole/VectoConsole.csproj
index cf2935dcb40b6f82b1d797fb0bf8e72cf50e96cf..7f48f347ae5be890cb3fa022303fcee68cdca42b 100644
--- a/VectoConsole/VectoConsole.csproj
+++ b/VectoConsole/VectoConsole.csproj
@@ -4,7 +4,7 @@
     <RootNamespace>VectoConsole</RootNamespace>
     <AssemblyName>vectocmd</AssemblyName>
     <ApplicationIcon>VECTO.ico</ApplicationIcon>
-    <TargetFrameworks>net45;net48;net6.0</TargetFrameworks>
+    <TargetFrameworks>net45;net48;net5.0</TargetFrameworks>
     <DefineConstants />
   </PropertyGroup>