Changing TSP contribution last second for 2025?

I think i messed up my calculations for this year. Contributed $20,850.89 as of today and I believe there will be one more investment that goes in to TSP at the end of december. That amount will be $2152 so I will be short of the 23,500 for the year by about $500. is there any way to make any modification at this point so I can max it out? Thanks