update subquery not working

UPDATE Employees
    SET
    JobTitle = 'Senior ' + JobTitle,
    Salary = 1.5 * Salary,
    HireDate = GETDATE(),
    --this does not work, why?
    ManagerID = (SELECT M.EmployeeID FROM Employees M WHERE M.LastName = 'Tamburello')
FROM Employees E
INNER JOIN Departments D
ON D.DepartmentID = E.DepartmentID
WHERE D.Name = 'Engineering'

UPDATE Employees
    SET
    JobTitle = 'Senior ' + JobTitle,
    Salary = 1.5 * Salary,
    HireDate = GETDATE(),
    --this works:
    ManagerID = 3
FROM Employees E
INNER JOIN Departments D
ON D.DepartmentID = E.DepartmentID
WHERE D.Name = 'Engineering'