solve

 sudoku

Again, just the 7's in rows 4 and 6 are enough to define the 7 at c5r5 for box 5.

The 5's in r8 and c6 define the 5 in box 8 at c5r7 and the 5's in c7 and c8 with the same 5 in c6 positions the 5 in box 6 at c8r4.

The new 5 in box 8 with the 5 in c6 and in r2 locates the 5 in box2 at c4r1 which in turn defines the 5 in box 1 at c2r3.
Finally, the new 5 in c2 with the 5 in c3 fixes the position of the 5 in box 4 at c1r6.

It often happens that finding one number ripples through the puzzle with satisfying results.