Since there’s an increase in tax liability, the IRS would consider this significant.
Whether it’s worth your time to amend is up to you, but according to IRS Topic No. 308 Amended Returns, you’d need to amend:
If you discover an error after filing your return, you may need to amend your return…. do file an amended return if there's a change in your filing status, income, deductions, credits or tax liability.
Please see the TurboTax Help article How to amend (change or correct) a return you already filed for instruction on how to amend your previously-filed tax return.
Note that Form 1040X, Amended U.S. Individual Income Tax Return, has a tentative release date of March 25, 2021 in TurboTax.
You might also consider -- and this is from my personal experience -- amending a return in TurboTax for a single item is not a big deal, timewise. You'll probably be done in under 10 minutes.
