The Republic of Ireland are down one place to 38th in the latest FIFA rankings.
Northern Ireland are up one to 31st.
Scotland are down six places from last month, and are now 30th.
England remain unchanged at 7th while Wales stay 67th.
Brazil, Spain and The Netherlands are still first, second and third respectively while Italy are up one to fourth.
Meanwhile Ireland's World Cup opponents Cyprus are down three to 76.