diff --git a/src/ConductorSharp.Engine/Util/ExpressionUtil.cs b/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
index ff46061..b93b127 100644
--- a/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
+++ b/src/ConductorSharp.Engine/Util/ExpressionUtil.cs
@@ -192,7 +192,15 @@ private static JArray ParseListInit(ListInitExpression listInitExpression)
         }
 
         private static bool IsDictionaryInitialization(Expression expr) =>
-            expr is ListInitExpression listExpr && listExpr.NewExpression.Type.IsAssignableTo(typeof(IDictionary<string, object>));
+            expr is ListInitExpression listExpr
+            && listExpr
+                .NewExpression.Type.GetInterfaces()
+                .Any(
+                    iface =>
+                        iface.IsGenericType
+                        && iface.GetGenericTypeDefinition() == typeof(IDictionary<,>)
+                        && iface.GenericTypeArguments[0] == typeof(string)
+                );
 
         private static JObject ParseDictionaryInitialization(ListInitExpression listExpression)
         {
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Tasks/DictionaryInputTask.cs b/test/ConductorSharp.Engine.Tests/Samples/Tasks/DictionaryInputTask.cs
index d2f2304..3bdec65 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Tasks/DictionaryInputTask.cs
+++ b/test/ConductorSharp.Engine.Tests/Samples/Tasks/DictionaryInputTask.cs
@@ -2,7 +2,9 @@
 
 public class DictionaryInputTaskInput : IRequest<DictionaryInputTaskOutput>
 {
-    public IDictionary<string, object> Input { get; set; }
+    public IDictionary<string, object> Object { get; set; }
+    public IDictionary<string, string> StringObject { get; set; }
+    public IDictionary<string, int> IntObject { get; set; }
 }
 
 public class DictionaryInputTaskOutput;
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.cs b/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.cs
index 6c68aed..f02672f 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.cs
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.Json.Nodes;
 using System.Threading.Tasks;
 
 namespace ConductorSharp.Engine.Tests.Samples.Workflows
@@ -31,7 +32,9 @@ public override void BuildDefinition()
                 wf =>
                     new()
                     {
-                        Input = new Dictionary<string, object>() { { "test1", "value" }, { "test2", new { MyProp = "test" } } }
+                        Object = new Dictionary<string, object>() { { "test1", "value" }, { "test2", new { MyProp = "test" } } },
+                        StringObject = new Dictionary<string, string>() { { "test", "test" } },
+                        IntObject = new Dictionary<string, int>() { { "test", 1 } }
                     }
             );
         }
diff --git a/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.json b/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.json
index e539515..a32c027 100644
--- a/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.json
+++ b/test/ConductorSharp.Engine.Tests/Samples/Workflows/DictionaryInitializationWorkflow.json
@@ -6,11 +6,17 @@
       "name": "dictionary_input_task",
       "taskReferenceName": "dictionary_task",
       "inputParameters": {
-        "input": {
+        "object": {
           "test1": "value",
           "test2": {
             "my_prop": "test"
           }
+        },
+        "string_object": {
+          "test": "test"
+        },
+        "int_object": {
+          "test": 1
         }
       },
       "type": "SIMPLE",