Euro 2016 qualifiers Northern Ireland have moved up to 26th in the Fifa world rankings, their best ever placing.
Wales slumped seven places to 24th in the latest list, England fell one spot to 10th, and the Republic of Ireland dropped two positions to 31st.
Scotland - who failed to qualify for the tournament in France - enjoyed a jump of five places into 40th place.
Argentina moved ahead of Belgium to top the rankings, with Chile, Colombia and Germany completing the top five.
The European Championship begins on 10 June, with the final taking place on 10 July.