Northern Ireland are down three places to 35th while Argentina remain first.
The Republic's next World Cup qualifier opponents Wales are 12th.
Meanwhile, UEFA wants 16 European places at the expanded 48-team World Cup in 2026.
The continent's governing body says it'll also ask FIFA to keep those countries apart in the first stage of the tournament.
The new format's expected to have 16 groups of three teams, with the top two going through to the knockout stage.
There were 13 European sides at the most recent World Cup in 2014.
