Since you are applying to naturalize less than 6 months before the expiration of your green card, you must renew your card:

24. If my Permanent Resident Card expires while I am applying for
naturalization, do I still need to apply for a new card?

If you apply for naturalization 6 months or more before the expiration date on your Permanent Resident Card (formerly known as an Alien Registration Card or “Green Card”), you do not have to apply for a new card. However, you may apply for a renewal card if you wish by using an “Application to Replace Permanent Resident Card” (Form I-90) and paying the appropriate fee. Call the USCIS Forms Line or visit www.uscis.gov.

If you apply for naturalization less than 6 months before the expiration date on your Permanent Resident Card, or do not apply for naturalization until your card has already expired, you must renew your card.

http://www.uscis.gov/files/article/M-476.pdf