diff --git a/src/clients/Elsa.Api.Client/Helpers/RefitSettingsHelper.cs b/src/clients/Elsa.Api.Client/Helpers/RefitSettingsHelper.cs
index fafd23891..b5e5de3c5 100644
--- a/src/clients/Elsa.Api.Client/Helpers/RefitSettingsHelper.cs
+++ b/src/clients/Elsa.Api.Client/Helpers/RefitSettingsHelper.cs
@@ -1,9 +1,6 @@
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using System.Text.Json.Serialization.Metadata;
 using Elsa.Api.Client.Converters;
-using Elsa.Api.Client.Resources.Alterations.Contracts;
-using Elsa.Api.Client.Resources.Alterations.Models;
 using Refit;
 
 namespace Elsa.Api.Client;
@@ -36,30 +33,7 @@ public static class RefitSettingsHelper
         options.Converters.Add(new JsonStringEnumConverter());
         options.Converters.Add(new VersionOptionsJsonConverter());
         options.Converters.Add(new TypeJsonConverter());
-
-        var alterationTypes = new[] { typeof(Cancel) };
-
-        options.TypeInfoResolver = new DefaultJsonTypeInfoResolver()
-            .WithAddedModifier(typeInfo =>
-            {
-                if (typeInfo.Type != typeof(IAlteration))
-                    return;
-
-                if (typeInfo.Kind != JsonTypeInfoKind.Object)
-                    return;
-
-                var polymorphismOptions = new JsonPolymorphismOptions { TypeDiscriminatorPropertyName = "type" };
-
-                foreach (var alterationType in alterationTypes.ToList())
-                {
-                    polymorphismOptions.DerivedTypes.Add(new(alterationType, alterationType.Name));
-                }
-
-                typeInfo.PolymorphismOptions = polymorphismOptions;
-            });
-
-        configureJsonSerializerOptions?.Invoke(serviceProvider, options);
-
+        
         return options;
     }
 }
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Contracts/IAlteration.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Contracts/IAlteration.cs
deleted file mode 100644
index 0ce1f7a50..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Contracts/IAlteration.cs
+++ /dev/null
@@ -1,6 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Contracts;
-
-/// <summary>
-/// Marker interface for all alteration classes
-/// </summary>
-public interface IAlteration;
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationBase.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationBase.cs
deleted file mode 100644
index 18615eca9..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationBase.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-using Elsa.Api.Client.Resources.Alterations.Contracts;
-
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// A base class for all IAlterations.
-/// </summary>
-public abstract class AlterationBase : IAlteration;
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlan.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlan.cs
index 993858cf5..dd5843d5f 100644
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlan.cs
+++ b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlan.cs
@@ -1,4 +1,4 @@
-using Elsa.Api.Client.Resources.Alterations.Contracts;
+using System.Text.Json.Nodes;
 using Elsa.Api.Client.Resources.Alterations.Enums;
 using Elsa.Api.Client.Shared.Models;
 
@@ -12,7 +12,7 @@ public class AlterationPlan : Entity
     /// <summary>
     /// The alterations to be applied.
     /// </summary>
-    public ICollection<IAlteration> Alterations { get; set; } = new List<IAlteration>();
+    public ICollection<JsonObject> Alterations { get; set; } = new List<JsonObject>();
 
     /// <summary>
     /// The IDs of the workflow instances that this plan applies to.
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlanParams.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlanParams.cs
index f9fc5a1c1..893aa89e6 100644
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlanParams.cs
+++ b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/AlterationPlanParams.cs
@@ -1,4 +1,4 @@
-using Elsa.Api.Client.Resources.Alterations.Contracts;
+using System.Text.Json.Nodes;
 
 namespace Elsa.Api.Client.Resources.Alterations.Models;
 
@@ -15,7 +15,7 @@ public class AlterationPlanParams
     /// <summary>
     /// The alterations to be applied.
     /// </summary>
-    public ICollection<IAlteration> Alterations { get; set; } = new List<IAlteration>();
+    public ICollection<JsonObject> Alterations { get; set; } = new List<JsonObject>();
     
     /// <summary>
     /// The IDs of the workflow instances that this plan applies to.
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Cancel.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Cancel.cs
deleted file mode 100644
index 45b2c836d..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Cancel.cs
+++ /dev/null
@@ -1,6 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// Cancels the workflow instances in an alteration plan.
-/// </summary>
-public class Cancel : AlterationBase;
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/CancelActivity.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/CancelActivity.cs
deleted file mode 100644
index 2500e7d97..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/CancelActivity.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// Cancels a workflow instance activity during an alteration
-/// </summary>
-public class CancelActivity : AlterationBase
-{
-    /// <summary>
-    /// The ID of the activity to be cancelled. If not specified, the activity instance ID will be used.
-    /// </summary>
-    public string? ActivityId { get; set; }
-
-    /// <summary>
-    /// The ID of the activity instance to be cancelled. If specified, overrides <see cref="ActivityId"/>.
-    /// </summary>
-    public string? ActivityInstanceId { get; set; }
-}
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Migrate.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Migrate.cs
deleted file mode 100644
index 1a4dc3b69..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/Migrate.cs
+++ /dev/null
@@ -1,12 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// Migrates a workflow instance to a newer version in an alteration.
-/// </summary>
-public class Migrate : AlterationBase
-{
-    /// <summary>
-    /// The target version to upgrade to.
-    /// </summary>
-    public int TargetVersion { get; set; }
-}
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ModifyVariable.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ModifyVariable.cs
deleted file mode 100644
index 60ab9f6ba..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ModifyVariable.cs
+++ /dev/null
@@ -1,18 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// Modifies a variable in a workflow instance alteration
-/// </summary>
-public class ModifyVariable : AlterationBase
-{
-    /// <summary>
-    /// The ID of the variable to modify.
-    /// </summary>
-    public string VariableId { get; set; } = default!;
-
-    /// <summary>
-    ///  The new value of the variable.
-    /// </summary>
-    public object? Value { get; set; }
-
-}
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ScheduleActivity.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ScheduleActivity.cs
deleted file mode 100644
index 2b0f77f6d..000000000
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Models/ScheduleActivity.cs
+++ /dev/null
@@ -1,17 +0,0 @@
-namespace Elsa.Api.Client.Resources.Alterations.Models;
-
-/// <summary>
-/// Schedules an activity for execution in an alteration.
-/// </summary>
-public class ScheduleActivity : AlterationBase
-{
-    /// <summary>
-    /// The ID of the next activity to be scheduled. If not specified, the ActivityInstanceId will be used.
-    /// </summary>
-    public string? ActivityId { get; set; }
-
-    /// <summary>
-    /// The ID of the activity instance to be scheduled. If not specified, the ActivityId will be used.
-    /// </summary>
-    public string? ActivityInstanceId { get; set; }
-}
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Resources/Alterations/Responses/RunRequest.cs b/src/clients/Elsa.Api.Client/Resources/Alterations/Responses/RunRequest.cs
index fdaf341e8..0d9995712 100644
--- a/src/clients/Elsa.Api.Client/Resources/Alterations/Responses/RunRequest.cs
+++ b/src/clients/Elsa.Api.Client/Resources/Alterations/Responses/RunRequest.cs
@@ -1,4 +1,4 @@
-using Elsa.Api.Client.Resources.Alterations.Contracts;
+using System.Text.Json.Nodes;
 
 namespace Elsa.Api.Client.Resources.Alterations.Responses;
 
@@ -10,7 +10,7 @@ public class RunRequest
     /// <summary>
     /// The alterations to be applied.
     /// </summary>
-    public ICollection<IAlteration> Alterations { get; set; } = new List<IAlteration>();
+    public ICollection<JsonObject> Alterations { get; set; } = new List<JsonObject>();
     
     /// <summary>
     /// The IDs of the workflow instances that this plan applies to.