diff --git a/backend/src/Modules/Auth/Application/Users/Register/RegisterUserCommandHandler.cs b/backend/src/Modules/Auth/Application/Users/Register/RegisterUserCommandHandler.cs
index 57d4b8a..331abb9 100644
--- a/backend/src/Modules/Auth/Application/Users/Register/RegisterUserCommandHandler.cs
+++ b/backend/src/Modules/Auth/Application/Users/Register/RegisterUserCommandHandler.cs
@@ -69,8 +69,9 @@ internal sealed class RegisterUserCommandHandler : ICommandHandler<RegisterUserC
 
         string token = _tokenProvider.Generate(userContract.Id, userContract.Username, userContract.DisplayName, userContract.Avatar);
         string refreshToken = _tokenProvider.GenerateRefreshToken();
+        DateTime refreshExpiry = _tokenProvider.GetRefreshTokenExpiry();
 
-        userContract.SetRefreshToken(refreshToken);
+        userContract.SetRefreshToken(refreshToken, refreshExpiry);
         await _userRepository.UpdateAsync(userContract, cancellationToken);
 
         return Result.Success(new AuthResponseDto
@@ -83,3 +84,4 @@ internal sealed class RegisterUserCommandHandler : ICommandHandler<RegisterUserC
         });
     }
 }
+
diff --git a/backend/src/Modules/Auth/Migrations/20270419220000_AddRefreshTokenExpiry.Designer.cs b/backend/src/Modules/Auth/Migrations/20270419220000_AddRefreshTokenExpiry.Designer.cs
index e28672c..0b980c8 100644
--- a/backend/src/Modules/Auth/Migrations/20270419220000_AddRefreshTokenExpiry.Designer.cs
+++ b/backend/src/Modules/Auth/Migrations/20270419220000_AddRefreshTokenExpiry.Designer.cs
@@ -39,9 +39,8 @@ namespace Knot.Modules.Auth.Migrations
                     b.Property<string>("Bio")
                         .HasColumnType("text");
 
-                    b.Property<DateTime>("Birthday")
-                        .HasColumnType("timestamp with time zone")
-                        .IsRequired(false);
+                    b.Property<DateTime?>("Birthday")
+                        .HasColumnType("timestamp with time zone");
 
                     b.Property<DateTime>("CreatedAt")
                         .HasColumnType("timestamp with time zone");