If you have not updated your W4 using the new 2020 W4, your employer will continue to calculate your withholds based on your old W4 entries. You are not required to update your W4, but your withholding may no longer be sufficient.
As part of the Tax Cuts and Jobs Act, the IRS and Treasury adjusted the tax withholding tables, which affects the amount of income taxes withheld from your pay. For 2020, W4's have been completely redesigned. Exemptions or Allowances are no longer applicable.
My suggestion is to use the IRS Tax Withholding Estimator here.
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