A lack of match action means that alterations are at a minimum, although Belgium, Switzerland and Mexico are among the most notable movers
This means that Germany remain second, Argentina third, Croatia fourth and Portugal fifth, as many of the European leagues' domestic seasons come to a close this month.
From highest to lowest, Colombia, England, Italy, Netherlands and Ecuador fill out the remainder of the stagnant top 10, with friendlies at the end of May and the Confederation Cup in June the next opportunity to rise up the rankings.
Switzerland (14th) and Belgium (15th) are two of the few movers as they both rise a single spot at the expense of Mexico, who drop down two places.
That 15th position is the highest ever ranking for Belgium, who are enjoying an excellent crop of players currently including Vincent Kompany, Eden Hazard and Mousa Dembele.
Nigeria have risen three places up to 28th, which sees USA, Japan and Norway drop down a place each following the end of April, with only seven international matches played.
Further down the table are more risers and fallers, the biggest of which are Grenada (up 20 places to 121st) and St Vincent and the Grenadines (down 10 places to 131st).