You have 2 potential routes here
1) pay UK voluntary contributions to keep up to date - but no tax relief available in Ireland- however, a lot will depend on your age and further contributions as to whether this will be worth while - and also - if you are a long way from retirement, will any UK (or Irish) pension be paid when you do retire? Check out potential returns on entitlements with UK Social Swcurity office - they can be very helpful.
2) check with Irish Social Security to see if you can have the contributions transferred to the Irish records (if you are intending to remain and draw an Irish pension).