Even though a Green Card has an expiration date, the Permanent Resident status of a person never expires. Once a person has been given Permanent Resident status, it is never taken away unless the person voluntarily gives it up or acts in a way that is contrary to the purpose of a greencard. The Green Card itself is simply official documentation of the status, much like an identification card. Therefore, it is important to keep your card up-to-date. Having an expired Green Card may make it difficult for you to prove that you are a permanent resident, and this could also affect your ability to travel or to prove your eligibility to work in the United States.

In order to keep your card updated, green card holders need apply for Green Card Renewal/renovación de green card by filing a Green card renewal Form I-90.

Or you can visit your nearest Immigration office or USCIS Vermont Service Center