diff --git a/Apps.Contentful/Actions/EntryActions.cs b/Apps.Contentful/Actions/EntryActions.cs
index 209a56f..81808a8 100644
--- a/Apps.Contentful/Actions/EntryActions.cs
+++ b/Apps.Contentful/Actions/EntryActions.cs
@@ -1235,6 +1235,11 @@ private static void ApplyListEntriesRequestFilters(NameValueCollection queryStri
         {
             queryString.Add("metadata.tags.sys.id[in]", string.Join(",", request.Tags));
         }
+        
+        if (!string.IsNullOrWhiteSpace(request.UpdatedBy))
+        {
+            queryString.Add("sys.updatedBy.sys.id", request.UpdatedBy);
+        }
 
         if (request.ExcludeTags is not null && request.ExcludeTags.Any())
         {
diff --git a/Apps.Contentful/Apps.Contentful.csproj b/Apps.Contentful/Apps.Contentful.csproj
index 2f09caf..9e85137 100644
--- a/Apps.Contentful/Apps.Contentful.csproj
+++ b/Apps.Contentful/Apps.Contentful.csproj
@@ -6,7 +6,7 @@
         <Nullable>enable</Nullable>
         <Product>Contentful</Product>
         <Description>The headless content management system</Description>
-        <Version>1.8.16</Version>
+        <Version>1.8.17</Version>
         <AssemblyName>Apps.Contentful</AssemblyName>
     </PropertyGroup>
 
diff --git a/Apps.Contentful/Models/Requests/ListEntriesRequest.cs b/Apps.Contentful/Models/Requests/ListEntriesRequest.cs
index a1f0f67..8215023 100644
--- a/Apps.Contentful/Models/Requests/ListEntriesRequest.cs
+++ b/Apps.Contentful/Models/Requests/ListEntriesRequest.cs
@@ -1,4 +1,5 @@
-using Apps.Contentful.DataSourceHandlers.Tags;
+using Apps.Contentful.DataSourceHandlers;
+using Apps.Contentful.DataSourceHandlers.Tags;
 using Apps.Contentful.Models.Identifiers;
 using Blackbird.Applications.Sdk.Common;
 using Blackbird.Applications.Sdk.Common.Dynamic;
@@ -42,4 +43,7 @@ public class ListEntriesRequest : ContentModelOptionalIdentifier
 
     [Display("Search term", Description = "Full‑text search across all text and symbol fields")]
     public string? SearchTerm { get; set; }
+
+    [Display("Updated by"), DataSource(typeof(UserDataSourceHandler))]
+    public string? UpdatedBy { get; set; }
 }
\ No newline at end of file
diff --git a/Tests.Contentful/Base/TestBase.cs b/Tests.Contentful/Base/TestBase.cs
index 08039ae..6082cdc 100644
--- a/Tests.Contentful/Base/TestBase.cs
+++ b/Tests.Contentful/Base/TestBase.cs
@@ -1,6 +1,7 @@
 using Blackbird.Applications.Sdk.Common.Authentication;
 using Blackbird.Applications.Sdk.Common.Invocation;
 using Microsoft.Extensions.Configuration;
+using Newtonsoft.Json;
 
 namespace Tests.Contentful.Base;
 
@@ -30,4 +31,9 @@ protected TestBase()
 
         FileManager = new FileManager();
     }
+
+    protected static void PrintJsonResult(object result)
+    {
+        Console.WriteLine(JsonConvert.SerializeObject(result, Formatting.Indented));
+    }
 }
\ No newline at end of file
diff --git a/Tests.Contentful/DataHandlerTests.cs b/Tests.Contentful/DataHandlerTests.cs
index 4278670..f256a45 100644
--- a/Tests.Contentful/DataHandlerTests.cs
+++ b/Tests.Contentful/DataHandlerTests.cs
@@ -55,4 +55,18 @@ public async Task LocaleDataSourceHandler_ReturnsLocales()
         Assert.IsNotNull(result);
         Console.WriteLine(JsonConvert.SerializeObject(result, Formatting.Indented));
     }
+
+    [TestMethod]
+    public async Task UserDataSourceHandler_ReturnsUsers()
+    {
+        // Arrange
+        var handler = new UserDataSourceHandler(InvocationContext);
+
+        // Act
+        var result = await handler.GetDataAsync(new(), default);
+
+        // Assert
+        Assert.IsNotNull(result);
+        PrintJsonResult(result);
+    }
 }
\ No newline at end of file
diff --git a/Tests.Contentful/EntryActionsTests.cs b/Tests.Contentful/EntryActionsTests.cs
index fdc073c..2bdafe5 100644
--- a/Tests.Contentful/EntryActionsTests.cs
+++ b/Tests.Contentful/EntryActionsTests.cs
@@ -29,14 +29,11 @@ public async Task ListEntries_NotExistingEnvironment_ShouldFailWithException()
     public async Task ListEntries_ValidEnvironment_ShouldReturnAllEntries()
     {
         var entryActions = new EntryActions(InvocationContext, FileManager);
-        var listEntriesRequest = new ListEntriesRequest { Environment = "dev", SearchTerm = "The perfect partner" };
+        var listEntriesRequest = new ListEntriesRequest { Environment = "master", UpdatedBy = "5UuNOI1TXxCkHgBChqQP9z" };
 
         var entriesResponse = await entryActions.ListEntries(listEntriesRequest);
 
-        foreach (var entry in entriesResponse.Entries)
-        {
-            Console.WriteLine($"{entry.ContentId}");
-        }
+        PrintJsonResult(entriesResponse);
     }
 
     [TestMethod]