can't keep up (with)Used both literally for being unable to follow someone physically and figuratively for being unable to keep up with a pace, trend, idea, or situation.
JA: 最近の技術の進歩にはついていけない。
EN: I can't keep up with recent technological advances.
can't keep up withUsed when you cannot physically keep up, understand someone's reasoning or pace, or go along with a plan or trend. It is the negative form of ついていく.
JA: 最近の技術の進歩にはついていけない。
EN: I can't keep up with recent technological advances.