Whether or not to refinance depends on your own personal financial situation. There are many mortgage options available examine each option thoroughly. Depending on your situation, the best option may be to do nothing at all.
Do you have the funds that refinancing may require to cover up-front costs and fees?
Refinancing your mortgage may require you to pay substantial up-front costs and fees. If you do not have enough money to pay the up-front costs completely it may be possible to finance some of the up-front costs by including them in the new mortgage.