diff --git a/src/FoSouzaDev.Common.Domain/Exceptions/ConflictException.cs b/src/FoSouzaDev.Common.Domain/Exceptions/ConflictException.cs
index 2f077cd..1afcd84 100644
--- a/src/FoSouzaDev.Common.Domain/Exceptions/ConflictException.cs
+++ b/src/FoSouzaDev.Common.Domain/Exceptions/ConflictException.cs
@@ -1,6 +1,6 @@
 namespace FoSouzaDev.Common.Domain.Exceptions;
 
-public sealed class ConflictException(string identifier) : Exception(message: "Already registered.")
+public sealed class ConflictException(Guid id) : Exception(message: "Already registered.")
 {
-    public string Identifier => identifier;
+    public Guid Id => id;
 }
\ No newline at end of file
diff --git a/src/FoSouzaDev.Common.Domain/FoSouzaDev.Common.Domain.csproj b/src/FoSouzaDev.Common.Domain/FoSouzaDev.Common.Domain.csproj
index a33851a..bc5e8a7 100644
--- a/src/FoSouzaDev.Common.Domain/FoSouzaDev.Common.Domain.csproj
+++ b/src/FoSouzaDev.Common.Domain/FoSouzaDev.Common.Domain.csproj
@@ -6,7 +6,7 @@
     
     <IsPackable>true</IsPackable>
     <PackageId>$(AssemblyName)</PackageId>
-    <Version>1.2.0</Version>
+    <Version>1.2.1</Version>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <Authors>Felipe Souza</Authors>
     <RepositoryUrl>https://github.com/fosouzadev/common-domain</RepositoryUrl>
diff --git a/tests/FoSouzaDev.Common.Domain.UnitaryTests/Exceptions/ConflictExceptionTest.cs b/tests/FoSouzaDev.Common.Domain.UnitaryTests/Exceptions/ConflictExceptionTest.cs
index 5b5c803..22053bd 100644
--- a/tests/FoSouzaDev.Common.Domain.UnitaryTests/Exceptions/ConflictExceptionTest.cs
+++ b/tests/FoSouzaDev.Common.Domain.UnitaryTests/Exceptions/ConflictExceptionTest.cs
@@ -1,5 +1,4 @@
-using AutoFixture;
-using FluentAssertions;
+using FluentAssertions;
 using FoSouzaDev.Common.Domain.Exceptions;
 
 namespace FoSouzaDev.Common.Domain.UnitaryTests.Exceptions;
@@ -10,13 +9,13 @@ public sealed class ConflictExceptionTest : BaseTest
     public void Constructor_Success_CreateAnException()
     {
         // Arrange
-        string expectedIdentifier = base.Fixture.Create<string>();
+        Guid expectedId = Guid.NewGuid();
 
         // Act
-        ConflictException ex = new(expectedIdentifier);
+        ConflictException ex = new(expectedId);
 
         // Assert
         ex.Message.Should().Be("Already registered.");
-        ex.Identifier.Should().Be(expectedIdentifier);
+        ex.Id.Should().Be(expectedId);
     }
 }
\ No newline at end of file