diff --git a/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs b/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs
new file mode 100644
index 000000000..95b172545
--- /dev/null
+++ b/src/modules/Elsa.Common/Converters/DecimalJsonConverter.cs
@@ -0,0 +1,32 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Elsa.Common.Converters;
+
+/// <summary>
+/// Converts decimals to and from JSON strings.
+/// </summary>
+public class DecimalJsonConverter : JsonConverter<decimal>
+{
+    /// <inheritdoc />
+    public override decimal Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType == JsonTokenType.Number)
+            return reader.GetDecimal();
+
+        if (reader.TokenType == JsonTokenType.String)
+        {
+            var value = reader.GetString()!;
+            return decimal.Parse(value);
+        }
+
+        throw new JsonException("Expected number or string.");
+    }
+
+    /// <inheritdoc />
+    public override void Write(Utf8JsonWriter writer, decimal value, JsonSerializerOptions options)
+    {
+        // Write the decimal as a JSON number
+        writer.WriteNumberValue(value);
+    }
+}
\ No newline at end of file
diff --git a/src/modules/Elsa.Workflows.Core/Serialization/Converters/IntegerConverter.cs b/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
similarity index 50%
rename from src/modules/Elsa.Workflows.Core/Serialization/Converters/IntegerConverter.cs
rename to src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
index a39129003..8c2bbf5b7 100644
--- a/src/modules/Elsa.Workflows.Core/Serialization/Converters/IntegerConverter.cs
+++ b/src/modules/Elsa.Common/Converters/IntegerJsonConverter.cs
@@ -1,28 +1,32 @@
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
-namespace Elsa.Workflows.Serialization.Converters;
+namespace Elsa.Common.Converters;
 
 /// <summary>
 /// Converts integers to and from JSON strings.
 /// </summary>
-public class IntegerConverter : JsonConverter<int>
+public class IntegerJsonConverter : JsonConverter<int>
 {
     /// <inheritdoc />
     public override int Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
     {
-        // Read the JSON string value and parse it as an integer
-        var value = reader.GetString()!;
-        var integer = int.Parse(value);
-        
-        // Return the parsed integer
-        return integer;
+        if (reader.TokenType == JsonTokenType.Number)
+            return reader.GetInt32();
+
+        if (reader.TokenType == JsonTokenType.String)
+        {
+            var value = reader.GetString()!;
+            return int.Parse(value);
+        }
+
+        throw new JsonException("Expected number or string.");
     }
 
     /// <inheritdoc />
     public override void Write(Utf8JsonWriter writer, int value, JsonSerializerOptions options)
     {
-        // Write the integer as a JSON number
+        // Write the integer as a JSON number.
         writer.WriteNumberValue(value);
     }
 }
\ No newline at end of file
diff --git a/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs b/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
index fc5c2179d..ab7185eb3 100644
--- a/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
+++ b/src/modules/Elsa.Common/Serialization/ConfigurableSerializer.cs
@@ -4,6 +4,7 @@ using System.Text.Json.Serialization;
 using System.Text.Json.Serialization.Metadata;
 using System.Text.Unicode;
 using Elsa.Common.Contracts;
+using Elsa.Common.Converters;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Elsa.Common.Serialization;
@@ -61,6 +62,8 @@ public abstract class ConfigurableSerializer
         
         options.Converters.Add(new JsonStringEnumConverter());
         options.Converters.Add(JsonMetadataServices.TimeSpanConverter);
+        options.Converters.Add(new IntegerJsonConverter());
+        options.Converters.Add(new DecimalJsonConverter());
 
         return options;
     }
diff --git a/src/modules/Elsa.Workflows.Core/Expressions/ObjectExpressionHandler.cs b/src/modules/Elsa.Workflows.Core/Expressions/ObjectExpressionHandler.cs
index 83bbdbfc7..6f4877850 100644
--- a/src/modules/Elsa.Workflows.Core/Expressions/ObjectExpressionHandler.cs
+++ b/src/modules/Elsa.Workflows.Core/Expressions/ObjectExpressionHandler.cs
@@ -1,17 +1,21 @@
+using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
+using Elsa.Common.Converters;
 using Elsa.Expressions.Contracts;
 using Elsa.Expressions.Helpers;
 using Elsa.Expressions.Models;
-using Elsa.Workflows.Serialization.Converters;
+using JetBrains.Annotations;
 
 namespace Elsa.Workflows.Expressions;
 
 /// <summary>
 /// Evaluates an object expression.
 /// </summary>
+[UsedImplicitly]
 public class ObjectExpressionHandler : IExpressionHandler
 {
     /// <inheritdoc />
+    [RequiresUnreferencedCode("The type is not known at compile time.")]
     public ValueTask<object?> EvaluateAsync(Expression expression, Type returnType, ExpressionExecutionContext context, ExpressionEvaluatorOptions options)
     {
         var value = expression.Value.ConvertTo<string>() ?? "";
@@ -20,7 +24,8 @@ public class ObjectExpressionHandler : IExpressionHandler
             return ValueTask.FromResult(default(object?));
 
         var serializerOptions = new JsonSerializerOptions();
-        serializerOptions.Converters.Add(new IntegerConverter());
+        serializerOptions.Converters.Add(new IntegerJsonConverter());
+        serializerOptions.Converters.Add(new DecimalJsonConverter());
         
         var converterOptions = new ObjectConverterOptions(serializerOptions);
         var model = value.ConvertTo(returnType, converterOptions);