The Boys in Green suffered a heavy defeat against Germany before beating Kazakhstan but now find themselves behind Cameroon and just ahead of Libya in the ranking
A 3-0 loss against Germany in Cologne on October 11 was followed by a 3-1 victory at home against Kazakhstan four days later. Nevertheless, the Boys in Green have continued their slide down the ranking table, having dropped 15 places last month. The fall to 60th marks Ireland's lowest ever ranking.
Spain hold on to top spot, but Argentina have been overtaken by Germany, who return to second in the table. World Cup hosts Brazil have once again dropped out of the top 10, while Switzerland rose seven places and now occupy seventh place.
After suffering defeat against Azerbaijan and drawing with Israel, Northern Ireland have fallen four places to 90th in the table.
England, who recently qualified for the World Cup, return to the top 10, rising seven places following victories over Poland and Montenegro in qualification.
Scotland, meanwhile, are now 35th in the ranking, rising a total of 28 places after their 2-0 win over Croatia. Wales went up eight places and are now ranked at 44 in the table.