Can't update individual row using Update lookup Rest API

Summary

Can't update individual row using Update lookup Rest API

Content

Hi,

I need to update the selected row value in lookup using OIC rest API, For example 'Row1' value should be updated to 'value2' from 'value1'. and other existing rows shouldn't affected.  But when i use Update lookup rest API, it replaces the entire rows with whatever present in rest API request, For example lookup contains 5 rows, when update lookup rest API runs for updating one row it actually replacing the 5 rows with 1 row.

 

Please let me know if there a way to update individual row in lookup without touching other rows.