diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0504b1..09dd05d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Add `DesignAutomation` and `IDesignAutomation` interface.
 - Add `DesignAutomationLoadVersion` to load the right version of the addin.
 - Add `AssemblyResolve` in the `DesignAutomationLoadVersion` to load dependencies in the right version.
+- Use `where T : IDesignAutomation` in `DesignAutomation<T>` and `DesignAutomationLoadVersion<T>`.
 
 ## [1.3.1] / 2025-06-15 - 2025-08-27
 - Add `AddInId` in the output. #9
diff --git a/DesignAutomationConsole/Bundle/RevitAddin.DA.Tester.bundle.zip b/DesignAutomationConsole/Bundle/RevitAddin.DA.Tester.bundle.zip
index bc626d3..149c1e2 100644
Binary files a/DesignAutomationConsole/Bundle/RevitAddin.DA.Tester.bundle.zip and b/DesignAutomationConsole/Bundle/RevitAddin.DA.Tester.bundle.zip differ
diff --git a/RevitAddin.DA.Tester/Revit/App.cs b/RevitAddin.DA.Tester/Revit/App.cs
index 99c6378..e1bf6f9 100644
--- a/RevitAddin.DA.Tester/Revit/App.cs
+++ b/RevitAddin.DA.Tester/Revit/App.cs
@@ -18,7 +18,7 @@ public ExternalDBApplicationResult OnStartup(ControlledApplication application)
             Console.WriteLine($"AddInName: \t{application.ActiveAddInId?.GetAddInName()}");
             Console.WriteLine("----------------------------------------");
 
-            designAutomation = new DesignAutomationLoadVersion(typeof(DesignAutomationController));
+            designAutomation = new DesignAutomationLoadVersion<DesignAutomationController>();
             return ExternalDBApplicationResult.Succeeded;
         }
 
diff --git a/RevitAddin.DA.Tester/Revit/DesignAutomation.cs b/RevitAddin.DA.Tester/Revit/DesignAutomation.cs
index ee21243..57fb9e7 100644
--- a/RevitAddin.DA.Tester/Revit/DesignAutomation.cs
+++ b/RevitAddin.DA.Tester/Revit/DesignAutomation.cs
@@ -3,7 +3,7 @@
 
 namespace RevitAddin.DA.Tester.Revit
 {
-    public class DesignAutomation<T> : DesignAutomation
+    public class DesignAutomation<T> : DesignAutomation where T : IDesignAutomation
     {
         public DesignAutomation() : base(Activator.CreateInstance(typeof(T)))
         {
diff --git a/RevitAddin.DA.Tester/Revit/DesignAutomationLoadVersion.cs b/RevitAddin.DA.Tester/Revit/DesignAutomationLoadVersion.cs
index 1b6ea98..1d68b7d 100644
--- a/RevitAddin.DA.Tester/Revit/DesignAutomationLoadVersion.cs
+++ b/RevitAddin.DA.Tester/Revit/DesignAutomationLoadVersion.cs
@@ -6,6 +6,14 @@
 
 namespace RevitAddin.DA.Tester.Revit
 {
+    public class DesignAutomationLoadVersion<T> : DesignAutomationLoadVersion where T : IDesignAutomation
+    {
+        public DesignAutomationLoadVersion() : base(typeof(T))
+        {
+
+        }
+    }
+
     public class DesignAutomationLoadVersion : IDisposable
     {
         readonly IDisposable designAutomation;
diff --git a/RevitAddin.DA.Tester/RevitAddin.DA.Tester.csproj b/RevitAddin.DA.Tester/RevitAddin.DA.Tester.csproj
index 6266006..10e1924 100644
--- a/RevitAddin.DA.Tester/RevitAddin.DA.Tester.csproj
+++ b/RevitAddin.DA.Tester/RevitAddin.DA.Tester.csproj
@@ -75,7 +75,7 @@
 
   <PropertyGroup>
     <PackageId>RevitAddin.DA.Tester</PackageId>
-    <Version>1.4.0-alpha</Version>
+    <Version>1.4.0-beta</Version>
     <ProjectGuid>{7C324916-9F8D-43B0-B226-DA67D2504393}</ProjectGuid>
   </PropertyGroup>