My US passport is expiring in May 2014, I will be visiting Beijing in January, do I need new one?

I will be meeting my sister in Beijing, she is from the Philippines, we will be sightseeing and will go to Shenzhen. From Beijing, I will be going to the Philiipines for a week then back to US in February. My US passport expires in May 2014, do I need to apply for a new passport? Please advise. Thank you.