And the wall of the city had twelve foundations,
and in them the names of the twelve apostles of the Lamb.
Revelation 21:14
Obviously Judas Iscariot's name will be replaced by Matthias....
That he may take part of this ministry and apostleship,
from which Judas by transgression fell, that he might go to his own place.
And they gave forth their lots; and the lot fell upon Matthias;
and he was numbered with the eleven apostles.
Acts 1:25,26