diff --git a/OCPP.Core.Database/OCPP.Core.Database.csproj b/OCPP.Core.Database/OCPP.Core.Database.csproj
index 90ee7ab..42518ad 100644
--- a/OCPP.Core.Database/OCPP.Core.Database.csproj
+++ b/OCPP.Core.Database/OCPP.Core.Database.csproj
@@ -1,17 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-    <Version>1.3.0</Version>
+    <TargetFramework>net8.0</TargetFramework>
+    <Version>1.3.1</Version>
     <Company>dallmann consulting GmbH</Company>
     <Product>OCPP.Core</Product>
     <Authors>Ulrich Dallmann</Authors>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.13" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.13" />
-    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.0.13" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.2" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.2" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.2" />
   </ItemGroup>
 
 </Project>
diff --git a/OCPP.Core.Management/OCPP.Core.Management.csproj b/OCPP.Core.Management/OCPP.Core.Management.csproj
index 50bb384..eb3f94a 100644
--- a/OCPP.Core.Management/OCPP.Core.Management.csproj
+++ b/OCPP.Core.Management/OCPP.Core.Management.csproj
@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-    <Version>1.3.0</Version>
+    <TargetFramework>net8.0</TargetFramework>
+    <Version>1.3.1</Version>
     <Company>dallmann consulting GmbH</Company>
     <Authors>Ulrich Dallmann</Authors>
     <Product>OCPP.Core</Product>
diff --git a/OCPP.Core.Server/OCPP.Core.Server.csproj b/OCPP.Core.Server/OCPP.Core.Server.csproj
index 056b18f..f34af9f 100644
--- a/OCPP.Core.Server/OCPP.Core.Server.csproj
+++ b/OCPP.Core.Server/OCPP.Core.Server.csproj
@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-    <Version>1.3.0</Version>
+    <TargetFramework>net8.0</TargetFramework>
+    <Version>1.3.1</Version>
     <Company>dallmann consulting GmbH</Company>
     <Product>OCPP.Core</Product>
     <Authors>Ulrich Dallmann</Authors>
diff --git a/OCPP.Core.Server/appsettings.json b/OCPP.Core.Server/appsettings.json
index 73c861a..8891d9f 100644
--- a/OCPP.Core.Server/appsettings.json
+++ b/OCPP.Core.Server/appsettings.json
@@ -37,7 +37,7 @@
   "ShowIndexInfo": true, // show status info in root web
   "MaxMessageSize": 1048576, // max. allowed message size in bytes
   "ValidateMessages": true,  // validate incoming messages against schema 
-  "DenyConcurrentTx": true,  // deny concurrent transactions with same charge-tag
+  "DenyConcurrentTx": false,  // deny concurrent transactions with same charge-tag
   "HeartBeatInterval":  300, // in seconds (=> interval is send to chargers)
 
   "ApiKey": "36029A5F-B736-4DA9-AE46-D66847C9062C",
diff --git a/README.md b/README.md
index e441c5b..7f8f611 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # OCPP.Core
-OCPP.Core is an OCPP ([Open ChargePoint Protocol](https://en.wikipedia.org/wiki/Open_Charge_Point_Protocol)) server written in .NET 6. It includes a management Web-UI for administration of charge points and charge tokens (RFID-Token)
+OCPP.Core is an OCPP ([Open ChargePoint Protocol](https://en.wikipedia.org/wiki/Open_Charge_Point_Protocol)) server written in .NET 8. It includes a management Web-UI for administration of charge points and charge tokens (RFID-Token)
 
 ## Status
 It currently supports OCPP1.6J and 2.0(JSON/REST).
 
-OCPP.Core is currently used with 4 [KEBA P30c/x](https://www.keba.com/de/emobility/products/c-series/c-serie) charge points operating in a load management and OCPP1.6J.
+OCPP.Core is currently used with 6 [KEBA P30c/x](https://www.keba.com/de/emobility/products/c-series/c-serie) charge points operating in a load management and OCPP1.6J.
 Here's a report of my [first real live experiences](Real_life_Experiences_KEBA.md).
 
 **Please send feedback if it works with your charge station or has issues**
@@ -70,7 +70,7 @@ This results in different scenarios for displaying charge points:
 If a connector has a name specified this name overrides the charge point name or default scheme (see above). This allows you to define custom names for every connector (like left / right).
 
 ## System Requirements
-OCPP.Core is written in .NET 6 and therefore runs on different plattforms. I also installed it in Azure for testing purposes.
+OCPP.Core is written in .NET 8 and therefore runs on different plattforms. I also installed it in Azure for testing purposes.
 The storage is based on the EntityFramework-Core and supports different databases. The project contains script für SQL-Server (SQL-Express) and SQLite.
 
 Referenced Packages:
@@ -121,6 +121,7 @@ An easy way to test the OCPP-Server are simulators:
 * [OCPP-2.0-CP-Simulator](https://github.com/JavaIsJavaScript/OCPP-2.0-CP-Simulator)
 
 Attention: Both simulators have minor and major bugs in certain actions. That's why I modified them both and included copies in this project.
+There also is an extended version of the 1.6 simulator with two connectors.
 
 Open one of the simulators in the browser and enter "ws://localhost:8081/OCPP/station42" as the central station URL.
 "station42" is the ID of the chargepoint you created in the previous step.